angular-cn/aio/content/guide/template-syntax.md

# Template Syntax

# 模板语法

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The Angular application manages what the user sees and can do, achieving this through the interaction of a
component class instance (the *component*) and its user-facing template.

Angular 应用管理着用户之所见和所为，并通过 Component 类的实例（*组件*）和面向用户的模板来与用户交互。

You may be familiar with the component/template duality from your experience with model-view-controller (MVC) or model-view-viewmodel (MVVM).
In Angular, the component plays the part of the controller/viewmodel, and the template represents the view.

从使用模型-视图-控制器 (MVC) 或模型-视图-视图模型 (MVVM) 的经验中，很多开发人员都熟悉了组件和模板这两个概念。
  在 Angular 中，组件扮演着控制器或视图模型的角色，模板则扮演视图的角色。

This page is a comprehensive technical reference to the Angular template language.
It explains basic principles of the template language and describes most of the syntax that you'll encounter elsewhere in the documentation.

这是一篇关于 Angular 模板语言的技术大全。
它解释了模板语言的基本原理，并描述了我们将在文档中其它地方遇到的大部分语法。

Many code snippets illustrate the points and concepts, all of them available
in the <live-example title="Template Syntax Live Code"></live-example>.

这里还有很多代码片段用来解释技术点和概念，它们全都在<live-example title="模板语法的在线例子"></live-example>中。

{@a html}

## HTML in templates

## 模板中的 HTML

HTML is the language of the Angular template.
Almost all HTML syntax is valid template syntax.
The `<script>` element is a notable exception;
it is forbidden, eliminating the risk of script injection attacks.
In practice, `<script>` is ignored and a warning appears in the browser console.
See the [Security](guide/security) page for details.

HTML 是 Angular 模板的语言。几乎所有的 HTML 语法都是有效的模板语法。
但值得注意的例外是 `<script>` 元素，它被禁用了，以阻止脚本注入攻击的风险。（实际上，`<script>` 只是被忽略了。）
参见[安全](guide/security)页了解详情。

Some legal HTML doesn't make much sense in a template.
The `<html>`, `<body>`, and `<base>` elements have no useful role.
Pretty much everything else is fair game.

有些合法的 HTML 被用在模板中是没有意义的。`<html>`、`<body>` 和 `<base>` 元素这个舞台上中并没有扮演有用的角色。剩下的所有元素基本上就都一样用了。

You can extend the HTML vocabulary of your templates with components and directives that appear as new elements and attributes.
In the following sections, you'll learn how to get and set DOM (Document Object Model) values dynamically through data binding.

可以通过组件和指令来扩展模板中的 HTML 词汇。它们看上去就是新元素和属性。接下来将学习如何通过数据绑定来动态获取/设置 DOM（文档对象模型）的值。

Begin with the first form of data binding&mdash;interpolation&mdash;to see how much richer template HTML can be.

我们首先看看数据绑定的第一种形式 —— 插值表达式，它展示了模板的 HTML 可以有多丰富。

<hr/>

{@a interpolation}

## Interpolation ( <span class="syntax">{&#xfeff;{...}}</span> )

## 插值表达式 ( <span class="syntax">{&#xfeff;{...}}</span> )

You met the double-curly braces of interpolation, `{{` and `}}`, early in your Angular education.

在以前的 Angular 教程中，我们遇到过由双花括号括起来的插值表达式，`{{` 和 `}}`。

<code-example path="template-syntax/src/app/app.component.html" region="first-interpolation" title="src/app/app.component.html" linenums="false">

</code-example>

You use interpolation to weave calculated strings into the text between HTML element tags and within attribute assignments.

插值表达式可以把计算后的字符串插入到 HTML 元素标签内的文本或对标签的属性进行赋值。

<code-example path="template-syntax/src/app/app.component.html" region="title+image" title="src/app/app.component.html" linenums="false">

</code-example>

The text between the braces is often the name of a component property. Angular replaces that name with the
string value of the corresponding component property. In the example above, Angular evaluates the `title` and `heroImageUrl` properties
and "fills in the blanks", first displaying a bold application title and then a heroic image.

在括号之间的“素材”，通常是组件属性的名字。Angular 会用组件中相应属性的字符串值，替换这个名字。
  上例中，Angular 计算 `title` 和 `heroImageUrl` 属性的值，并把它们填在空白处。
  首先显示粗体的应用标题，然后显示英雄的图片。

More generally, the text between the braces is a **template expression** that Angular first **evaluates**
and then **converts to a string**. The following interpolation illustrates the point by adding the two numbers:

一般来说，括号间的素材是一个**模板表达式**，Angular 先**对它求值**，再把它**转换成字符串**。
  下列插值表达式通过把括号中的两个数字相加说明了这一点：

<code-example path="template-syntax/src/app/app.component.html" region="sum-1" title="src/app/app.component.html" linenums="false">

</code-example>

The expression can invoke methods of the host component such as `getVal()`, seen here:

这个表达式可以调用宿主组件的方法，就像下面用的 `getVal()`：

<code-example path="template-syntax/src/app/app.component.html" region="sum-2" title="src/app/app.component.html" linenums="false">

</code-example>

Angular evaluates all expressions in double curly braces,
converts the expression results to strings, and links them with neighboring literal strings. Finally,
it assigns this composite interpolated result to an **element or directive property**.

Angular 对所有双花括号中的表达式求值，把求值的结果转换成字符串，并把它们跟相邻的字符串字面量连接起来。最后，把这个组合出来的插值结果赋给**元素或指令的属性**。

You appear to be inserting the result between element tags and assigning it to attributes.
It's convenient to think so, and you rarely suffer for this mistake.
Though this is not exactly true. Interpolation is a special syntax that Angular converts into a
[property binding](guide/template-syntax#property-binding), as is explained [below](guide/template-syntax#property-binding-or-interpolation).

表面上看，我们在元素标签之间插入了结果和对标签的属性进行了赋值。
这样思考起来很方便，并且这个误解很少给我们带来麻烦。
但严格来讲，这是不对的。插值表达式是一个特殊的语法，Angular 把它转换成了[属性绑定](guide/template-syntax#property-binding)，[后面](guide/template-syntax#property-binding-or-interpolation)将会解释这一点。

But first, let's take a closer look at template expressions and statements.

讲解属性绑定之前，先深入了解一下模板表达式和模板语句。

<hr/>

{@a template-expressions}

## Template expressions

## 模板表达式

A template **expression** produces a value.
Angular executes the expression and assigns it to a property of a binding target;
the target might be an HTML element, a component, or a directive.

模板**表达式**产生一个值。
  Angular 执行这个表达式，并把它赋值给绑定目标的属性，这个绑定目标可能是 HTML 元素、组件或指令。

The interpolation braces in `{{1 + 1}}` surround the template expression `1 + 1`.
In the [property binding](guide/template-syntax#property-binding) section below,
a template expression appears in quotes to the right of the&nbsp;`=` symbol as in `[property]="expression"`.

`{{1 + 1}}` 中所包含的模板表达式是 `1 + 1`。
  在[属性绑定](guide/template-syntax#property-binding)中会再次看到模板表达式，它出现在 `=` 右侧的引号中，就像这样：`[property]="expression"`。

You write these template expressions in a language that looks like JavaScript.
Many JavaScript expressions are legal template expressions, but not all.

编写模板表达式所用的语言看起来很像 JavaScript。
  很多 JavaScript 表达式也是合法的模板表达式，但不是全部。

JavaScript expressions that have or promote side effects are prohibited,
including:

JavaScript 中那些具有或可能引发副作用的表达式是被禁止的，包括：

* assignments (`=`, `+=`, `-=`, ...)

   赋值 (`=`, `+=`, `-=`, ...)

* <code>new</code>

   `new` 运算符

* chaining expressions with <code>;</code> or <code>,</code>

   使用 `;` 或 `,` 的链式表达式

* increment and decrement operators (`++` and `--`)

   自增或自减操作符 (`++` 和 `--`)

Other notable differences from JavaScript syntax include:

和 JavaScript 语 法的其它显著不同包括：

* no support for the bitwise operators `|` and `&`

   不支持位运算 `|` 和 `&`

* new [template expression operators](guide/template-syntax#expression-operators), such as `|`, `?.` and `!`.

   具有新的[模板表达式运算符](guide/template-syntax#expression-operators)，比如 `|`、`?.` 和 `!`。

{@a expression-context}

### Expression context

### 表达式上下文

The *expression context* is typically the _component_ instance.
In the following snippets, the `title`  within double-curly braces and the
`isUnchanged` in quotes refer to properties of the `AppComponent`.

典型的*表达式上下文*就是这个**组件实例**，它是各种绑定值的来源。
在下面的代码片段中，双花括号中的 `title` 和引号中的 `isUnchanged` 所引用的都是 `AppComponent` 中的属性。

<code-example path="template-syntax/src/app/app.component.html" region="context-component-expression" title="src/app/app.component.html" linenums="false">

</code-example>

An expression may also refer to properties of the _template's_ context
such as a [template input variable](guide/template-syntax#template-input-variable) (`let hero`)
or a [template reference variable](guide/template-syntax#ref-vars) (`#heroInput`).

表达式的上下文可以包括组件之外的对象。
  比如[模板输入变量](guide/template-syntax#template-input-variable) (`let hero`)和[模板引用变量](guide/template-syntax#ref-vars)(`#heroInput`)就是备选的上下文对象之一。

<code-example path="template-syntax/src/app/app.component.html" region="context-var" title="src/app/app.component.html" linenums="false">

</code-example>

The context for terms in an expression is a blend of the _template variables_,
the directive's _context_ object (if it has one), and the component's _members_.
If you reference a name that belongs to more than one of these namespaces,
the template variable name takes precedence, followed by a name in the directive's _context_,
and, lastly, the component's member names.

表达式中的上下文变量是由*模板变量*、指令的*上下文变量*（如果有）和组件的*成员*叠加而成的。
如果我们要引用的变量名存在于一个以上的命名空间中，那么，模板变量是最优先的，其次是指令的上下文变量，最后是组件的成员。

The previous example presents such a name collision. The component has a `hero`
property and the `*ngFor` defines a `hero` template variable.
The `hero` in `{{hero.name}}`
refers to the template input variable, not the component's property.

上一个例子中就体现了这种命名冲突。组件具有一个名叫 `hero` 的属性，而 `*ngFor` 声明了一个也叫 `hero` 的模板变量。
在 `{{hero.name}}` 表达式中的 `hero` 实际引用的是模板变量，而不是组件的属性。

Template expressions cannot refer to anything in
the global namespace (except `undefined`). They can't refer to `window` or `document`. They
can't call `console.log` or `Math.max`. They are restricted to referencing
members of the expression context.

模板表达式不能引用全局命名空间中的任何东西，比如 `window` 或 `document`。它们也不能调用 `console.log` 或 `Math.max`。
它们只能引用表达式上下文中的成员。

{@a no-side-effects}

{@a expression-guidelines}

### Expression guidelines

### 表达式指南

Template expressions can make or break an application.
Please follow these guidelines:

模板表达式能成就或毁掉一个应用。请遵循下列指南：

* [No visible side effects](guide/template-syntax#no-visible-side-effects)

   [没有可见的副作用](guide/template-syntax#no-visible-side-effects)

* [Quick execution](guide/template-syntax#quick-execution)

   [执行迅速](guide/template-syntax#quick-execution)

* [Simplicity](guide/template-syntax#simplicity)

   [非常简单](guide/template-syntax#simplicity)

* [Idempotence](guide/template-syntax#idempotence)

   [幂等性](guide/template-syntax#idempotence)

The only exceptions to these guidelines should be in specific circumstances that you thoroughly understand.

超出上面指南外的情况应该只出现在那些你确信自己已经彻底理解的特定场景中。

#### No visible side effects

#### 没有可见的副作用

A template expression should not change any application state other than the value of the
target property.

模板表达式除了目标属性的值以外，不应该改变应用的任何状态。

This rule is essential to Angular's "unidirectional data flow" policy.
You should never worry that reading a component value might change some other displayed value.
The view should be stable throughout a single rendering pass.

这条规则是 Angular “单向数据流”策略的基础。
永远不用担心读取组件值可能改变另外的显示值。
在一次单独的渲染过程中，视图应该总是稳定的。

#### Quick execution

#### 执行迅速

Angular executes template expressions after every change detection cycle.
Change detection cycles are triggered by many asynchronous activities such as
promise resolutions, http results, timer events, keypresses and mouse moves.

Angular 执行模板表达式比我们想象的频繁。
它们可能在每一次按键或鼠标移动后被调用。

Expressions should finish quickly or the user experience may drag, especially on slower devices.
Consider caching values when their computation is expensive.

表达式应该快速结束，否则用户就会感到拖沓，特别是在较慢的设备上。
当计算代价较高时，应该考虑缓存那些从其它值计算得出的值。

#### Simplicity

#### 非常简单

Although it's possible to write quite complex template expressions, you should avoid them.

虽然也可以写出相当复杂的模板表达式，但不要那么写。

A property name or method call should be the norm.
An occasional Boolean negation (`!`) is OK.
Otherwise, confine application and business logic to the component itself,
where it will be easier to develop and test.

常规是属性名或方法调用。偶尔的逻辑取反 (`!`) 也还凑合。
其它情况下，应在组件中实现应用和业务逻辑，使开发和测试变得更容易。

#### Idempotence

#### 幂等性

An [idempotent](https://en.wikipedia.org/wiki/Idempotence) expression is ideal because
it is free of side effects and improves Angular's change detection performance.

最好使用[幂等的](https://en.wikipedia.org/wiki/Idempotence)表达式，因为它没有副作用，并且能提升 Angular 变更检测的性能。

In Angular terms, an idempotent expression always returns *exactly the same thing* until
one of its dependent values changes.

在 Angular 的术语中，幂等的表达式应该总是返回*完全相同的东西*，直到某个依赖值发生改变。

Dependent values should not change during a single turn of the event loop.
If an idempotent expression returns a string or a number, it returns the same string or number
when called twice in a row. If the expression returns an object (including an `array`),
it returns the same object *reference* when called twice in a row.

在单独的一次事件循环中，被依赖的值不应该改变。
  如果幂等的表达式返回一个字符串或数字，连续调用它两次，也应该返回相同的字符串或数字。
  如果幂等的表达式返回一个对象（包括 `Date` 或 `Array`），连续调用它两次，也应该返回同一个对象的*引用*。

<hr/>

{@a template-statements}

## Template statements

## 模板语句

A template **statement** responds to an **event** raised by a binding target
such as an element, component, or directive.
You'll see template statements in the [event binding](guide/template-syntax#event-binding) section,
appearing in quotes to the right of the `=`&nbsp;symbol as in `(event)="statement"`.

模板**语句**用来响应由绑定目标（如 HTML 元素、组件或指令）触发的**事件**。
模板语句将在[事件绑定](guide/template-syntax#event-binding)一节看到，它出现在 `=` 号右侧的引号中，就像这样：`(event)="statement"`。

<code-example path="template-syntax/src/app/app.component.html" region="context-component-statement" title="src/app/app.component.html" linenums="false">

</code-example>

A template statement *has a side effect*.
That's the whole point of an event.
It's how you update application state from user action.

模板语句*有副作用*。
这是事件处理的关键。因为我们要根据用户的输入更新应用状态。

Responding to events is the other side of Angular's "unidirectional data flow".
You're free to change anything, anywhere, during this turn of the event loop.

响应事件是 Angular 中“单向数据流”的另一面。
    在一次事件循环中，可以随意改变任何地方的任何东西。

Like template expressions, template *statements* use a language that looks like JavaScript.
The template statement parser differs from the template expression parser and
specifically supports both basic assignment (`=`) and chaining expressions
(with <code>;</code> or <code>,</code>).

和模板表达式一样，模板*语句*使用的语言也像 JavaScript。
  模板语句解析器和模板表达式解析器有所不同，特别之处在于它支持基本赋值 (`=`) 和表达式链 (`;` 和 `,`)。

However, certain JavaScript syntax is not allowed:

然而，某些 JavaScript 语法仍然是不允许的：

* <code>new</code>

   `new` 运算符

* increment and decrement operators, `++` and `--`

   自增和自减运算符：`++` 和 `--`

* operator assignment, such as `+=` and `-=`

   操作并赋值，例如 `+=` 和 `-=`

* the bitwise operators `|` and `&`

   位操作符 `|` 和 `&`

* the [template expression operators](guide/template-syntax#expression-operators)

   [模板表达式运算符](guide/template-syntax#expression-operators)

### Statement context

### 语句上下文

As with expressions, statements can refer only to what's in the statement context
such as an event handling method of the component instance.

和表达式中一样，语句只能引用语句上下文中 —— 通常是正在绑定事件的那个**组件实例**。

The *statement context* is typically the component instance.
The *deleteHero* in `(click)="deleteHero()"` is a method of the data-bound component.

典型的*语句上下文*就是当前组件的实例。
`(click)="deleteHero()"` 中的*deleteHero*就是这个数据绑定组件上的一个方法。

<code-example path="template-syntax/src/app/app.component.html" region="context-component-statement" title="src/app/app.component.html" linenums="false">

</code-example>

The statement context may also refer to properties of the template's own context.
In the following examples, the template `$event` object,
a [template input variable](guide/template-syntax#template-input-variable) (`let hero`),
and a [template reference variable](guide/template-syntax#ref-vars) (`#heroForm`)
are passed to an event handling method of the component.

语句上下文可以引用模板自身上下文中的属性。
在下面的例子中，就把模板的 `$event` 对象、[模板输入变量](guide/template-syntax#template-input-variable) (`let hero`)和[模板引用变量](guide/template-syntax#ref-vars) (`#heroForm`)传给了组件中的一个事件处理器方法。

<code-example path="template-syntax/src/app/app.component.html" region="context-var-statement" title="src/app/app.component.html" linenums="false">

</code-example>

Template context names take precedence over component context names.
In `deleteHero(hero)` above, the `hero` is the template input variable,
not the component's `hero` property.

模板上下文中的变量名的优先级高于组件上下文中的变量名。在上面的 `deleteHero(hero)` 中，`hero` 是一个模板输入变量，而不是组件中的 `hero` 属性。

Template statements cannot refer to anything in the global namespace. They
can't refer to `window` or `document`.
They can't call `console.log` or `Math.max`.

模板语句不能引用全局命名空间的任何东西。比如不能引用 `window` 或 `document`，也不能调用 `console.log` 或 `Math.max`。

### Statement guidelines

### 语句指南

As with expressions, avoid writing complex template statements.
A method call or simple property assignment should be the norm.

和表达式一样，避免写复杂的模板语句。
常规是函数调用或者属性赋值。

Now that you have a feel for template expressions and statements,
you're ready to learn about the varieties of data binding syntax beyond interpolation.

现在，对模板表达式和语句有了一点感觉了吧。
  除插值表达式外，还有各种各样的数据绑定语法，是学习它们是时候了。

<hr/>

{@a binding-syntax}

## Binding syntax: An overview

## 绑定语法：概览

Data binding is a mechanism for coordinating what users see, with application data values.
While you could push values to and pull values from HTML,
the application is easier to write, read, and maintain if you turn these chores over to a binding framework.
You simply declare bindings between binding sources and target HTML elements and let the framework do the work.

数据绑定是一种机制，用来协调用户所见和应用数据。
  虽然我们能往 HTML 推送值或者从 HTML 拉取值，
  但如果把这些琐事交给数据绑定框架处理，
  应用会更容易编写、阅读和维护。
  只要简单地在绑定源和目标 HTML 元素之间声明绑定，框架就会完成这项工作。

Angular provides many kinds of data binding.
This guide covers most of them, after a high-level view of Angular data binding and its syntax.

Angular 提供了各种各样的数据绑定，本章将逐一讨论。
不过我们要先从高层视角来看看 Angular 数据绑定及其语法。

Binding types can be grouped into three categories distinguished by the direction of data flow:
from the _source-to-view_, from _view-to-source_, and in the two-way sequence: _view-to-source-to-view_:

绑定的类型可以根据数据流的方向分成三类：
*从数据源到视图*、*从视图到数据源*以及双向的*从视图到数据源再到视图*。

<style>
  td, th {vertical-align: top}
</style>

<table width="100%">
  <col width="30%">
  </col>
  <col width="50%">
  </col>
  <col width="20%">
  </col>

  <tr>

    <th>

      Data direction

      数据方向

    </th>

    <th>

      Syntax

      语法

    </th>

    <th>

      Type

      绑定类型

    </th>

  </tr>

  <tr>

    <td>

      One-way<br>from data source<br>to view target

    </td>

    <td>

      <code-example>

        {{expression}}
        [target]="expression"
        bind-target="expression"

      </code-example>

    </td>

    <td>

      Interpolation<br>
      Property<br>
      Attribute<br>
      Class<br>
      Style

      插值表达式<br>
      属性<br>
      Attribute<br>
      CSS 类<br>
      样式

    </td>

    <tr>

      <td>

        One-way<br>from view target<br>to data source

        从视图到数据源的单向绑定

      </td>

      <td>

        <code-example>

          (target)="statement"
          on-target="statement"

        </code-example>

      </td>

      <td>

        Event

        事件

      </td>

    </tr>

    <tr>

      <td>

        Two-way

        双向

      </td>

      <td>

        <code-example>

          [(target)]="expression"
          bindon-target="expression"

        </code-example>

      </td>

      <td>

        Two-way

        双向

      </td>

    </tr>

  </tr>

</table>


<div class="alert is-important">

译注：由于 HTML attribute 和 DOM property 在中文中都被翻译成了“属性”，无法区分，
而接下来的部分重点是对它们进行比较。

我们无法改变历史，因此，在本章的翻译中，保留了它们的英文形式，不加翻译，以免混淆。
本章中，如果提到“属性”的地方，一定是指 property，因为在 Angular 中，实际上很少涉及 attribute。

但在其它章节中，为简单起见，凡是能通过上下文明显区分开的，就仍统一译为“属性”，
区分不明显的，会加注英文。

</div>


Binding types other than interpolation have a **target name** to the left of the equal sign,
either surrounded by punctuation (`[]`, `()`) or preceded by a prefix (`bind-`, `on-`, `bindon-`).

除了插值表达式之外的绑定类型，在等号左边是**目标名**，
  无论是包在括号中 (`[]`、`()`) 还是用前缀形式 (`bind-`、`on-`、`bindon-`) 。

The target name is the name of a _property_. It may look like the name of an _attribute_ but it never is.
To appreciate the difference, you must develop a new way to think about template HTML.

这个目标名就是*属性（Property）*的名字。它可能看起来像是*元素属性（Attribute）*的名字，但它不是。
要理解它们的不同点，我们必须尝试用另一种方式来审视模板中的 HTML。

### A new mental model

### 新的思维模型

With all the power of data binding and the ability to extend the HTML vocabulary
with custom markup, it is tempting to think of template HTML as *HTML Plus*.

数据绑定的威力和允许用自定义标记扩展 HTML 词汇的能力，容易误导我们把模板 HTML 当成 *HTML+*。

It really *is* HTML Plus.
But it's also significantly different than the HTML you're used to.
It requires a new mental model.

它其实*就是* HTML+。
但它也跟我们熟悉的 HTML 有着显著的不同。
我们需要一种新的思维模型。

In the normal course of HTML development, you create a visual structure with HTML elements, and
you modify those elements by setting element attributes with string constants.

在正常的 HTML 开发过程中，我们使用 HTML 元素创建视觉结构，
通过把字符串常量设置到元素的 attribute 来修改那些元素。

<code-example path="template-syntax/src/app/app.component.html" region="img+button" title="src/app/app.component.html" linenums="false">

</code-example>

You still create a structure and initialize attribute values this way in Angular templates.

在 Angular 模板中，我们仍使用同样的方式来创建结构和初始化 attribute 值。

Then you learn to create new elements with components that encapsulate HTML
and drop them into templates as if they were native HTML elements.

然后，用封装了 HTML 的组件创建新元素，并把它们当作原生 HTML 元素在模板中使用。

<code-example path="template-syntax/src/app/app.component.html" region="hero-detail-1" title="src/app/app.component.html" linenums="false">

</code-example>

That's HTML Plus.

这就是 HTML+。

Then you learn about data binding. The first binding you meet might look like this:

现在开始学习数据绑定。我们碰到的第一种数据绑定是这样的：

<code-example path="template-syntax/src/app/app.component.html" region="disabled-button-1" title="src/app/app.component.html" linenums="false">

</code-example>

You'll get to that peculiar bracket notation in a moment. Looking beyond it,
your intuition suggests that you're binding to the button's `disabled` attribute and setting
it to the current value of the component's `isUnchanged` property.

过会儿再认识那个怪异的方括号记法。直觉告诉我们，我们正在绑定按钮的 `disabled` attribute。
  并把它设置为组件的 `isUnchanged` 属性的当前值。

Your intuition is incorrect! Your everyday HTML mental model is misleading.
In fact, once you start data binding, you are no longer working with HTML *attributes*. You aren't setting attributes.
You are setting the *properties* of DOM elements, components, and directives.

但我们的直觉是错的！日常的 HTML 思维模式在误导我们。
实际上，一旦开始数据绑定，就不再跟 HTML attribute 打交道了。
这里不是设置 attribute，而是设置 DOM 元素、组件和指令的 property。

<div class="l-sub-section">

### HTML attribute vs. DOM property

### HTML attribute 与 DOM property 的对比

The distinction between an HTML attribute and a DOM property is crucial to understanding how Angular binding works.

要想理解 Angular 绑定如何工作，重点是搞清 HTML attribute 和 DOM property 之间的区别。

**Attributes are defined by HTML. Properties are defined by the DOM (Document Object Model).**

**attribute 是由 HTML 定义的。property 是由 DOM (Document Object Model) 定义的。**

* A few HTML attributes have 1:1 mapping to properties. `id` is one example.

   少量 HTML attribute 和 property 之间有着 1:1 的映射，如 `id`。

* Some HTML attributes don't have corresponding properties. `colspan` is one example.

   有些 HTML attribute 没有对应的 property，如 `colspan`。

* Some DOM properties don't have corresponding attributes. `textContent` is one example.

   有些 DOM property 没有对应的 attribute，如 `textContent`。

* Many HTML attributes appear to map to properties ... but not in the way you might think!

   大量 HTML attribute 看起来映射到了 property…… 但却不像我们想的那样！

That last category is confusing until you grasp this general rule:

最后一类尤其让人困惑…… 除非我们能理解这个普遍原则：

**Attributes *initialize* DOM properties and then they are done.
Property values can change; attribute values can't.**

**attribute *初始化* DOM property，然后它们的任务就完成了。property 的值可以改变；attribute 的值不能改变。**

For example, when the browser renders `<input type="text" value="Bob">`, it creates a
corresponding DOM node with a `value` property *initialized* to "Bob".

例如，当浏览器渲染 `<input type="text" value="Bob">` 时，它将创建相应 DOM 节点，
它的 `value` 这个 property 被*初始化为* “Bob”。

When the user enters "Sally" into the input box, the DOM element `value` *property* becomes "Sally".
But the HTML `value` *attribute* remains unchanged as you discover if you ask the input element
about that attribute: `input.getAttribute('value')` returns "Bob".

当用户在输入框中输入 “Sally” 时，DOM 元素的 `value` 这个 *property* 变成了 “Sally”。
但是该 HTML 的 `value` 这个 *attribute* 保持不变。如果我们读取 input 元素的 attribute，就会发现确实没变：
`input.getAttribute('value') // 返回 "Bob"`。

The HTML attribute `value` specifies the *initial* value; the DOM `value` property is the *current* value.

HTML 的 `value` 这个 attribute 指定了*初始*值；DOM 的 `value` 这个 property 是*当前*值。

The `disabled` attribute is another peculiar example. A button's `disabled` *property* is
`false` by default so the button is enabled.
When you add the `disabled` *attribute*, its presence alone initializes the  button's `disabled` *property* to `true`
so the button is disabled.

`disabled` 这个 attribute 是另一种特例。按钮的 `disabled` 这个 *property* 是 `false`，因为默认情况下按钮是可用的。
当我们添加 `disabled` 这个 *attribute* 时，只要它出现了按钮的 `disabled` 这个 *property* 就初始化为 `true`，于是按钮就被禁用了。

Adding and removing the `disabled` *attribute* disables and enables the button. The value of the *attribute* is irrelevant,
which is why you cannot enable a button by writing `<button disabled="false">Still Disabled</button>`.

添加或删除 `disabled` 这个 *attribute*会禁用或启用这个按钮。但 *attribute* 的值无关紧要，这就是我们为什么没法通过
`<button disabled="false">仍被禁用</button>` 这种写法来启用按钮。

Setting the button's `disabled` *property*  (say, with an Angular binding) disables or enables the button.
The value of the *property* matters.

设置按钮的 `disabled` 这个 *property*（如，通过 Angular 绑定）可以禁用或启用这个按钮。
这就是 *property* 的价值。

**The HTML attribute and the DOM property are not the same thing, even when they have the same name.**

**就算名字相同，HTML attribute 和 DOM property 也不是同一样东西。**

</div>

This fact bears repeating:
**Template binding works with *properties* and *events*, not *attributes*.**

这句话值得再强调一次：
**模板绑定是通过 *property* 和*事件*来工作的，而不是 *attribute*。**

<div class="callout is-helpful">

<header>A world without attributes</header>

<header>没有 attribute 的世界</header>

In the world of Angular, the only role of attributes is to initialize element and directive state.
When you write a data binding, you're dealing exclusively with properties and events of the target object.
HTML attributes effectively disappear.

在 Angular 的世界中，attribute 唯一的作用是用来初始化元素和指令的状态。
当进行数据绑定时，只是在与元素和指令的 property 和事件打交道，而 attribute 就完全靠边站了。

</div>

With this model firmly in mind, read on to learn about binding targets.

把这个思维模型牢牢的印在脑子里，接下来，学习什么是绑定目标。

### Binding targets

### 绑定目标

The **target of a data binding** is something in the DOM.
Depending on the binding type, the target can be an
(element | component | directive) property, an
(element | component | directive) event, or (rarely) an attribute name.
The following table summarizes:

**数据绑定的目标**是 DOM 中的某些东西。
这个目标可能是（元素 | 组件 | 指令的）property、（元素 | 组件 | 指令的）事件，或(极少数情况下) attribute 名。
下面是的汇总表：

<style>
  td, th {vertical-align: top}
</style>

<table width="100%">
  <col width="10%">
  </col>
  <col width="15%">
  </col>
  <col width="75%">
  </col>

  <tr>

    <th>

      Type

      绑定类型

    </th>

    <th>

      Target

      目标

    </th>

    <th>

      Examples

      范例

    </th>

  </tr>

  <tr>

    <td>

      Property

      属性

    </td>

    <td>

      Element&nbsp;property<br>
      Component&nbsp;property<br>
      Directive&nbsp;property

      元素的 property<br>
      组件的 property<br>
      指令的 property

    </td>

    <td>

      <code-example path="template-syntax/src/app/app.component.html" region="property-binding-syntax-1" title="src/app/app.component.html" linenums="false">

      </code-example>

    </td>

  </tr>

  <tr>

    <td>

      Event

      事件

    </td>

    <td>

      Element&nbsp;event<br>
      Component&nbsp;event<br>
      Directive&nbsp;event

      元素的事件<br>
      组件的事件<br>
      指令的事件

    </td>

    <td>

      <code-example path="template-syntax/src/app/app.component.html" region="event-binding-syntax-1" title="src/app/app.component.html" linenums="false">

      </code-example>

    </td>

  </tr>

  <tr>

    <td>

      Two-way

      双向

    </td>

    <td>

      Event and property

      事件与 property

    </td>

    <td>

      <code-example path="template-syntax/src/app/app.component.html" region="2-way-binding-syntax-1" title="src/app/app.component.html" linenums="false">

      </code-example>

    </td>

  </tr>

  <tr>

    <td>

      Attribute

    </td>

    <td>

      Attribute
      (the&nbsp;exception)

      attribute（例外情况）

    </td>

    <td>

      <code-example path="template-syntax/src/app/app.component.html" region="attribute-binding-syntax-1" title="src/app/app.component.html" linenums="false">

      </code-example>

    </td>

  </tr>

  <tr>

    <td>

      Class

      CSS 类

    </td>

    <td>

      <code>class</code> property

    </td>

    <td>

      <code-example path="template-syntax/src/app/app.component.html" region="class-binding-syntax-1" title="src/app/app.component.html" linenums="false">

      </code-example>

    </td>

  </tr>

  <tr>

    <td>

      Style

      样式

    </td>

    <td>

      <code>style</code> property

    </td>

    <td>

      <code-example path="template-syntax/src/app/app.component.html" region="style-binding-syntax-1" title="src/app/app.component.html" linenums="false">

      </code-example>

    </td>

  </tr>

</table>

With this broad view in mind, you're ready to look at binding types in detail.

放开眼界，我们来看看每种绑定类型的具体情况。

<hr/>

{@a property-binding}

## Property binding ( <span class="syntax">[property]</span> )

## 属性绑定 ( <span class="syntax">[属性名]</span> )

Write a template **property binding** to set a property of a view element.
The binding sets the property to the value of a [template expression](guide/template-syntax#template-expressions).

当要把视图元素的属性 (property) 设置为[模板表达式](guide/template-syntax#template-expressions)时，就要写模板的**属性 (property) 绑定**。

The most common property binding sets an element property to a component property value. An example is
binding the `src` property of an image element to a component's `heroImageUrl` property:

最常用的属性绑定是把元素属性设置为组件属性的值。
下面这个例子中，image 元素的 `src` 属性会被绑定到组件的 `heroImageUrl` 属性上：

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-1" title="src/app/app.component.html" linenums="false">

</code-example>

Another example is disabling a button when the component says that it `isUnchanged`:

另一个例子是当组件说它 `isUnchanged`（未改变）时禁用按钮：

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-2" title="src/app/app.component.html" linenums="false">

</code-example>

Another is setting a property of a directive:

另一个例子是设置指令的属性：

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-3" title="src/app/app.component.html" linenums="false">

</code-example>

Yet another is setting the model property of a custom component (a great way
for parent and child components to communicate):

还有另一个例子是设置自定义组件的模型属性（这是父子组件之间通讯的重要途径）：

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-4" title="src/app/app.component.html" linenums="false">

</code-example>

### One-way *in*

### 单向*输入*

People often describe property binding as *one-way data binding* because it flows a value in one direction,
from a component's data property into a target element property.

人们经常把属性绑定描述成*单向数据绑定*，因为值的流动是单向的，从组件的数据属性流动到目标元素的属性。

You cannot use property binding to pull values *out* of the target element.
You can't bind to a property of the target element to _read_ it. You can only _set_ it.

不能使用属性绑定来从目标元素拉取值，也不能绑定到目标元素的属性来读取它。只能设置它。

<div class="l-sub-section">

Similarly, you cannot use property binding to *call* a method on the target element.

也不能使用属性 绑定 来*调用*目标元素上的方法。

If the element raises events, you can listen to them with an [event binding](guide/template-syntax#event-binding).

如果这个元素触发了事件，可以通过[事件绑定](guide/template-syntax#event-binding)来监听它们。

If you must read a target element property or call one of its methods,
you'll need a different technique.
See the API reference for
[ViewChild](api/core/ViewChild) and
[ContentChild](api/core/ContentChild).

如果必须读取目标元素上的属性或调用它的某个方法，得用另一种技术。
参见 API 参考手册中的
[ViewChild](api/core/ViewChild) 和
[ContentChild](api/core/ContentChild)。

</div>

### Binding target

### 绑定目标

An element property between enclosing square brackets identifies the target property.
The target property in the following code is the image element's `src` property.

包裹在方括号中的元素属性名标记着目标属性。下列代码中的目标属性是 image 元素的 `src` 属性。

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-1" title="src/app/app.component.html" linenums="false">

</code-example>

Some people prefer the `bind-` prefix alternative, known as the *canonical form*:

有些人喜欢用 `bind-` 前缀的可选形式，并称之为*规范形式*：

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-5" title="src/app/app.component.html" linenums="false">

</code-example>

The target name is always the name of a property, even when it appears to be the name of something else.
You see `src` and may think it's the name of an attribute. No. It's the name of an image element property.

目标的名字总是 property 的名字。即使它看起来和别的名字一样。
看到 `src` 时，可能会把它当做 attribute。不！它不是！它是 image 元素的 property 名。

Element properties may be the more common targets,
but Angular looks first to see if the name is a property of a known directive,
as it is in the following example:

元素属性可能是最常见的绑定目标，但 Angular 会先去看这个名字是否是某个已知指令的属性名，就像下面的例子中一样：

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-3" title="src/app/app.component.html" linenums="false">

</code-example>

<div class="l-sub-section">

Technically, Angular is matching the name to a directive [input](guide/template-syntax#inputs-outputs),
one of the property names listed in the directive's `inputs` array or a property decorated with `@Input()`.
Such inputs map to the directive's own properties.

严格来说，Angular 正在匹配指令的[输入属性](guide/template-syntax#inputs-outputs)的名字。
这个名字是指令的 `inputs` 数组中所列的名字，或者是带有 `@Input()` 装饰器的属性。
这些输入属性被映射为指令自己的属性。

</div>

If the name fails to match a property of a known directive or element, Angular reports an “unknown directive” error.

如果名字没有匹配上已知指令或元素的属性，Angular 就会报告“未知指令”的错误。

### Avoid side effects

### 消除副作用

As mentioned previously, evaluation of a template expression should have no visible side effects.
The expression language itself does its part to keep you safe.
You can't assign a value to anything in a property binding expression nor use the increment and decrement operators.

正如以前讨论过的，模板表达式的计算不能有可见的副作用。表达式语言本身可以提供一部分安全保障。
  不能在属性绑定表达式中对任何东西赋值，也不能使用自增、自减运算符。

Of course, the expression might invoke a property or method that has side effects.
Angular has no way of knowing that or stopping you.

当然，表达式可能会调用具有副作用的属性或方法。但 Angular 没法知道这一点，也没法阻止我们。

The expression could call something like `getFoo()`. Only you know what `getFoo()` does.
If `getFoo()` changes something and you happen to be binding to that something, you risk an unpleasant experience.
Angular may or may not display the changed value. Angular may detect the change and throw a warning error.
In general, stick to data properties and to methods that return values and do no more.

表达式中可以调用像 `getFoo()` 这样的方法。只有我们知道 `getFoo()` 干了什么。
如果 `getFoo()` 改变了某个东西，恰好又绑定到个这个东西，我们就可能把自己坑了。
Angular 可能显示也可能不显示变化后的值。Angular 还可能检测到变化，并抛出警告型错误。
一般建议是，只绑定数据属性和那些只返回值而不做其它事情的方法。

### Return the proper type

### 返回恰当的类型

The template expression should evaluate to the type of value expected by the target property.
Return a string if the target property expects a string.
Return a number if the target property expects a number.
Return an object if the target property expects an object.

模板表达式应该返回目标属性所需类型的值。
如果目标属性想要个字符串，就返回字符串。
如果目标属性想要个数字，就返回数字。
如果目标属性想要个对象，就返回对象。

The `hero` property of the `HeroDetail` component expects a `Hero` object, which is exactly what you're sending in the property binding:

`HeroDetail` 组件的 `hero` 属性想要一个 `Hero` 对象，那就在属性绑定中精确地给它一个 `Hero` 对象：

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-4" title="src/app/app.component.html" linenums="false">

</code-example>

### Remember the brackets

### 别忘了方括号

The brackets tell Angular to evaluate the template expression.
If you omit the brackets, Angular treats the string as a constant
and *initializes the target property* with that string.
It does *not* evaluate the string!

方括号告诉 Angular 要计算模板表达式。
如果忘了加方括号，Angular 会把这个表达式当做字符串常量看待，并用该字符串来*初始化目标属性*。
它*不会*计算这个字符串。

Don't make the following mistake:

不要出现这样的失误：

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-6" title="src/app/app.component.html" linenums="false">

</code-example>

{@a one-time-initialization}

### One-time string initialization

### 一次性字符串初始化

You *should* omit the brackets when all of the following are true:

当满足下列条件时，*应该*省略括号：

* The target property accepts a string value.

   目标属性接受字符串值。

* The string is a fixed value that you can bake into the template.

   字符串是个固定值，可以直接合并到模块中。

* This initial value never changes.

   这个初始值永不改变。

You routinely initialize attributes this way in standard HTML, and it works
just as well for directive and component property initialization.
The following example initializes the `prefix` property of the `HeroDetailComponent` to a fixed string,
not a template expression. Angular sets it and forgets about it.

我们经常这样在标准 HTML 中用这种方式初始化 attribute，这种方式也可以用在初始化指令和组件的属性。
下面这个例子把 `HeroDetailComponent` 的 `prefix` 属性初始化为固定的字符串，而不是模板表达式。Angular 设置它，然后忘记它。

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-7" title="src/app/app.component.html" linenums="false">

</code-example>

The `[hero]` binding, on the other hand, remains a live binding to the component's `currentHero` property.

作为对比，`[hero]` 绑定是组件的 `currentHero` 属性的活绑定，它会一直随着更新。

{@a property-binding-or-interpolation}

### Property binding or interpolation?

### 属性绑定还是插值表达式？

You often have a choice between interpolation and property binding.
The following binding pairs do the same thing:

我们通常得在插值表达式和属性绑定之间做出选择。
下列这几对绑定做的事情完全相同：

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-vs-interpolation" title="src/app/app.component.html" linenums="false">

</code-example>

_Interpolation_ is a convenient alternative to _property binding_ in many cases.

在多数情况下，插值表达式是更方便的备选项。
实际上，在渲染视图之前，Angular 把这些插值表达式翻译成相应的属性绑定。

When rendering data values as strings, there is no technical reason to prefer one form to the other.
You lean toward readability, which tends to favor interpolation.
You suggest establishing coding style rules and choosing the form that
both conforms to the rules and feels most natural for the task at hand.

当要渲染的数据类型是字符串时，没有技术上的理由证明哪种形式更好。
我们倾向于可读性，所以倾向于插值表达式。
建议建立代码风格规则，选择一种形式，
这样，既遵循了规则，又能让手头的任务做起来更自然。

When setting an element property to a non-string data value, you must use _property binding_.

但数据类型不是字符串时，就必须使用*属性绑定*了。

#### Content security

#### 内容安全

Imagine the following *malicious content*.

假设下面的*恶意内容*

<code-example path="template-syntax/src/app/app.component.ts" region="evil-title" title="src/app/app.component.ts" linenums="false">

</code-example>

Fortunately, Angular data binding is on alert for dangerous HTML.
It [*sanitizes*](guide/security#sanitization-and-security-contexts) the values before displaying them.
It **will not** allow HTML with script tags to leak into the browser, neither with interpolation
nor property binding.

幸运的是，Angular 数据绑定对危险 HTML 有防备。
在显示它们之前，它对内容先进行*消毒*。
不管是插值表达式还是属性绑定，都**不会**允许带有 script 标签的 HTML 泄漏到浏览器中。

<code-example path="template-syntax/src/app/app.component.html" region="property-binding-vs-interpolation-sanitization" title="src/app/app.component.html" linenums="false">

</code-example>

Interpolation handles the script tags differently than property binding but both approaches render the
content harmlessly.

插值表达式处理 script 标签与属性绑定有所不同，但是二者都只渲染没有危害的内容。

<figure>
  <img src='generated/images/guide/template-syntax/evil-title.png' alt="evil title made safe">
</figure>

<hr/>

{@a other-bindings}

## Attribute, class, and style bindings

## attribute、class 和 style 绑定

The template syntax provides specialized one-way bindings for scenarios less well suited to property binding.

模板语法为那些不太适合使用属性绑定的场景提供了专门的单向数据绑定形式。

### Attribute binding

### attribute 绑定

You can set the value of an attribute directly with an **attribute binding**.

可以通过**attribute 绑定**来直接设置 attribute 的值。

<div class="l-sub-section">

This is the only exception to the rule that a binding sets a target property.
This is the only binding that creates and sets an attribute.

这是“绑定到目标属性 (property)”这条规则中唯一的例外。这是唯一的能创建和设置 attribute 的绑定形式。

</div>

This guide stresses repeatedly that setting an element property with a property binding
is always preferred to setting the attribute with a string. Why does Angular offer attribute binding?

本章中，通篇都在说通过属性绑定来设置元素的属性总是好于用字符串设置 attribute。为什么 Angular 还提供了 attribute 绑定呢？

**You must use attribute binding when there is no element property to bind.**

**因为当元素没有属性可绑的时候，就必须使用 attribute 绑定。**

Consider the [ARIA](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA),
[SVG](https://developer.mozilla.org/en-US/docs/Web/SVG), and
table span attributes. They are pure attributes.
They do not correspond to element properties, and they do not set element properties.
There are no property targets to bind to.

考虑 [ARIA](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA)，
  [SVG](https://developer.mozilla.org/en-US/docs/Web/SVG) 和 table 中的 colspan/rowspan 等 attribute。
  它们是纯粹的 attribute，没有对应的属性可供绑定。

This fact becomes painfully obvious when you write something like this.

如果想写出类似下面这样的东西，现状会令我们痛苦：

<code-example language="html">

  &lt;tr&gt;&lt;td colspan="{{1 + 1}}"&gt;Three-Four&lt;/td&gt;&lt;/tr&gt;

</code-example>

And you get this error:

会得到这个错误：

<code-example format="nocode">

  Template parse errors:
  Can't bind to 'colspan' since it isn't a known native property

</code-example>

As the message says, the `<td>` element does not have a `colspan` property.
It has the "colspan" *attribute*, but
interpolation and property binding can set only *properties*, not attributes.

正如提示中所说，`<td>` 元素没有 `colspan` 属性。
  但是插值表达式和属性绑定只能设置*属性*，不能设置 attribute。

You need attribute bindings to create and bind to such attributes.

我们需要 attribute 绑定来创建和绑定到这样的 attribute。

Attribute binding syntax resembles property binding.
Instead of an element property between brackets, start with the prefix **`attr`**,
followed by a dot (`.`) and the name of the attribute.
You then set the attribute value, using an expression that resolves to a string.

attribute 绑定的语法与属性绑定类似。
  但方括号中的部分不是元素的属性名，而是由**`attr`**前缀，一个点 (`.`) 和 attribute 的名字组成。
  可以通过值为字符串的表达式来设置 attribute 的值。

Bind `[attr.colspan]` to a calculated value:

这里把 `[attr.colspan]` 绑定到一个计算值：

<code-example path="template-syntax/src/app/app.component.html" region="attrib-binding-colspan" title="src/app/app.component.html" linenums="false">

</code-example>

Here's how the table renders:

这里是表格渲染出来的样子：

<table border="1px">

  <tr>

      <td colspan="2">

          One-Two

      </td>

  </tr>

  <tr>

      <td>

          Five

      </td>

<td>

    Six

</td>

  </tr>

 </table>

One of the primary use cases for attribute binding
is to set ARIA attributes, as in this example:

attribute 绑定的主要用例之一是设置 ARIA attribute（译注：ARIA 指可访问性，用于给残障人士访问互联网提供便利），
就像这个例子中一样：

<code-example path="template-syntax/src/app/app.component.html" region="attrib-binding-aria" title="src/app/app.component.html" linenums="false">

</code-example>

<hr/>

### Class binding

### CSS 类绑定

You can add and remove CSS class names from an element's `class` attribute with
a **class binding**.

借助 **CSS 类绑定**，可以从元素的 `class` attribute 上添加和移除 CSS 类名。

Class binding syntax resembles property binding.
Instead of an element property between brackets, start with the prefix `class`,
optionally followed by a dot (`.`) and the name of a CSS class: `[class.class-name]`.

CSS 类绑定绑定的语法与属性绑定类似。
但方括号中的部分不是元素的属性名，而是由**`class`**前缀，一个点 (`.`)和 CSS 类的名字组成，
其中后两部分是可选的。形如：`[class.class-name]`。

The following examples show how to add and remove the application's "special" class
with class bindings.  Here's how to set the attribute without binding:

下列例子示范了如何通过 CSS 类绑定来添加和移除应用的 "special" 类。不用绑定直接设置 attribute 时是这样的：

<code-example path="template-syntax/src/app/app.component.html" region="class-binding-1" title="src/app/app.component.html" linenums="false">

</code-example>

You can replace that with a binding to a string of the desired class names; this is an all-or-nothing, replacement binding.

可以把它改写为绑定到所需 CSS 类名的绑定；这是一个或者全有或者全无的替换型绑定。
（译注：即当 badCurly 有值时 class 这个 attribute 设置的内容会被完全覆盖）

<code-example path="template-syntax/src/app/app.component.html" region="class-binding-2" title="src/app/app.component.html" linenums="false">

</code-example>

Finally, you can bind to a specific class name.
Angular adds the class when the template expression evaluates to truthy.
It removes the class when the expression is falsy.

最后，可以绑定到特定的类名。
  当模板表达式的求值结果是真值时，Angular 会添加这个类，反之则移除它。

<code-example path="template-syntax/src/app/app.component.html" region="class-binding-3" title="src/app/app.component.html" linenums="false">

</code-example>

<div class="l-sub-section">

While this is a fine way to toggle a single class name,
the [NgClass directive](guide/template-syntax#ngClass) is usually preferred when managing multiple class names at the same time.

虽然这是切换单一类名的好办法，但我们通常更喜欢使用 [NgClass 指令](guide/template-syntax#ngClass) 来同时管理多个类名。

</div>

<hr/>

### Style binding

### 样式绑定

You can set inline styles with a **style binding**.

通过**样式绑定**，可以设置内联样式。

Style binding syntax resembles property binding.
Instead of an element property between brackets, start with the prefix `style`,
followed by a dot (`.`) and the name of a CSS style property: `[style.style-property]`.

样式绑定的语法与属性绑定类似。
但方括号中的部分不是元素的属性名，而由**`style`**前缀，一个点 (`.`)和 CSS 样式的属性名组成。
形如：`[style.style-property]`。

<code-example path="template-syntax/src/app/app.component.html" region="style-binding-1" title="src/app/app.component.html" linenums="false">

</code-example>

Some style binding styles have a unit extension.
The following example conditionally sets the font size in  “em” and “%” units .

有些样式绑定中的样式带有单位。在这里，以根据条件用 “em” 和 “%” 来设置字体大小的单位。

<code-example path="template-syntax/src/app/app.component.html" region="style-binding-2" title="src/app/app.component.html" linenums="false">

</code-example>

<div class="l-sub-section">

While this is a fine way to set a single style,
the [NgStyle directive](guide/template-syntax#ngStyle) is generally preferred when setting several inline styles at the same time.

虽然这是设置单一样式的好办法，但我们通常更喜欢使用 [NgStyle 指令](guide/template-syntax#ngStyle) 来同时设置多个内联样式。

</div>

<div class="l-sub-section">

Note that a _style property_ name can be written in either
[dash-case](guide/glossary#dash-case), as shown above, or
[camelCase](guide/glossary#camelcase), such as `fontSize`.

注意，_样式属性_命名方法可以用[中线命名法](guide/glossary#dash-case)，像上面的一样
    也可以用[驼峰式命名法](guide/glossary#camelcase)，如 `fontSize`。

</div>

<hr/>

{@a event-binding}

## Event binding  ( <span class="syntax">(event)</span> )

## 事件绑定  ( <span class="syntax">(事件名)</span> )

The bindings directives you've met so far flow data in one direction: **from a component to an element**.

前面遇到的绑定的数据流都是单向的：**从组件到元素**。

Users don't just stare at the screen. They enter text into input boxes. They pick items from lists.
They click buttons. Such user actions may result in a flow of data in the opposite direction:
**from an element to a component**.

但用户不会只盯着屏幕看。他们会在输入框中输入文本。他们会从列表中选取条目。
他们会点击按钮。这类用户动作可能导致反向的数据流：*从元素到组件*。

The only way to know about a user action is to listen for certain events such as
keystrokes, mouse movements, clicks, and touches.
You declare your interest in user actions through Angular event binding.

知道用户动作的唯一方式是监听某些事件，如按键、鼠标移动、点击和触摸屏幕。
可以通过 Angular 事件绑定来声明对哪些用户动作感兴趣。

Event binding syntax consists of a **target event** name
within parentheses on the left of an equal sign, and a quoted
[template statement](guide/template-syntax#template-statements) on the right.
The following event binding listens for the button's click events, calling
the component's `onSave()` method whenever a click occurs:

事件绑定语法由等号左侧带圆括号的**目标事件**和右侧引号中的[模板语句](guide/template-syntax#template-statements)组成。
下面事件绑定监听按钮的点击事件。每当点击发生时，都会调用组件的 `onSave()` 方法。

<code-example path="template-syntax/src/app/app.component.html" region="event-binding-1" title="src/app/app.component.html" linenums="false">

</code-example>

### Target event

### 目标事件

A **name between parentheses** &mdash; for example, `(click)` &mdash;
identifies the target event. In the following example, the target is the button's click event.

**圆括号中的名称** —— 比如 `(click)` —— 标记出目标事件。在下面例子中，目标是按钮的 click 事件。

<code-example path="template-syntax/src/app/app.component.html" region="event-binding-1" title="src/app/app.component.html" linenums="false">

</code-example>

Some people prefer the `on-` prefix alternative, known as the **canonical form**:

有些人更喜欢带 `on-` 前缀的备选形式，称之为**规范形式**：

<code-example path="template-syntax/src/app/app.component.html" region="event-binding-2" title="src/app/app.component.html" linenums="false">

</code-example>

Element events may be the more common targets, but Angular looks first to see if the name matches an event property
of a known directive, as it does in the following example:

元素事件可能是更常见的目标，但 Angular 会先看这个名字是否能匹配上已知指令的事件属性，就像下面这个例子：

<code-example path="template-syntax/src/app/app.component.html" region="event-binding-3" title="src/app/app.component.html" linenums="false">

</code-example>

<div class="l-sub-section">

The `myClick` directive is further described in the section
on [aliasing input/output properties](guide/template-syntax#aliasing-io).

更多关于该 `myClick` 指令的解释，见[给输入/输出属性起别名](guide/template-syntax#aliasing-io)。

</div>

If the name fails to match an element event or an output property of a known directive,
Angular reports an “unknown directive” error.

如果这个名字没能匹配到元素事件或已知指令的输出属性，Angular 就会报“未知指令”错误。

### *$event* and event handling statements

### *$event* 和事件处理语句

In an event binding, Angular sets up an event handler for the target event.

在事件绑定中，Angular 会为目标事件设置事件处理器。

When the event is raised, the handler executes the template statement.
The template statement typically involves a receiver, which performs an action
in response to the event, such as storing a value from the HTML control
into a model.

当事件发生时，这个处理器会执行模板语句。
典型的模板语句通常涉及到响应事件执行动作的接收器，例如从 HTML 控件中取得值，并存入模型。

The binding conveys information about the event, including data values, through
an **event object named `$event`**.

绑定会通过**名叫 `$event` 的事件对象**传递关于此事件的信息（包括数据值）。

The shape of the event object is determined by the target event.
If the target event is a native DOM element event, then `$event` is a
[DOM event object](https://developer.mozilla.org/en-US/docs/Web/Events),
with properties such as `target` and `target.value`.

事件对象的形态取决于目标事件。如果目标事件是原生 DOM 元素事件，
`$event` 就是 [DOM 事件对象](https://developer.mozilla.org/en-US/docs/Web/Events)，它有像 `target` 和 `target.value` 这样的属性。

Consider this example:

考虑这个范例：

<code-example path="template-syntax/src/app/app.component.html" region="without-NgModel" title="src/app/app.component.html" linenums="false">

</code-example>

This code sets the input box `value` property by binding to the `name` property.
To listen for changes to the value, the code binds to the input box's `input` event.
When the user makes changes, the `input` event is raised, and the binding executes
the statement within a context that includes the DOM event object, `$event`.

上面的代码在把输入框的 `value` 属性绑定到 `firstName` 属性。
要监听对值的修改，代码绑定到输入框的 `input` 事件。
当用户造成更改时，`input` 事件被触发，并在包含了 DOM 事件对象 (`$event`) 的上下文中执行这条语句。

To update the `name` property, the changed text is retrieved by following the path `$event.target.value`.

要更新 `firstName` 属性，就要通过路径 `$event.target.value` 来获取更改后的值。

If the event belongs to a directive (recall that components are directives),
`$event` has whatever shape the directive decides to produce.

如果事件属于指令（回想一下，组件是指令的一种），那么 `$event` 具体是什么由指令决定。

{@a eventemitter}

{@a custom-event}

### Custom events with <span class="syntax">EventEmitter</span>

### 使用 <span class="syntax">EventEmitter</span> 实现自定义事件

Directives typically raise custom events with an Angular [EventEmitter](api/core/EventEmitter).
The directive creates an `EventEmitter` and exposes it as a property.
The directive calls `EventEmitter.emit(payload)` to fire an event, passing in a message payload, which can be anything.
Parent directives listen for the event by binding to this property and accessing the payload through the `$event` object.

通常，指令使用 Angular [EventEmitter](api/core/EventEmitter) 来触发自定义事件。
指令创建一个 `EventEmitter` 实例，并且把它作为属性暴露出来。
指令调用 `EventEmitter.emit(payload)` 来触发事件，可以传入任何东西作为消息载荷。
父指令通过绑定到这个属性来监听事件，并通过 `$event` 对象来访问载荷。

Consider a `HeroDetailComponent` that presents hero information and responds to user actions.
Although the `HeroDetailComponent` has a delete button it doesn't know how to delete the hero itself.
The best it can do is raise an event reporting the user's delete request.

假设 `HeroDetailComponent` 用于显示英雄的信息，并响应用户的动作。
虽然 `HeroDetailComponent` 包含删除按钮，但它自己并不知道该如何删除这个英雄。
最好的做法是触发事件来报告“删除用户”的请求。

Here are the pertinent excerpts from that `HeroDetailComponent`:

下面的代码节选自 `HeroDetailComponent`：

<code-example path="template-syntax/src/app/hero-detail.component.ts" linenums="false" title="src/app/hero-detail.component.ts (template)" region="template-1">

</code-example>

<code-example path="template-syntax/src/app/hero-detail.component.ts" linenums="false" title="src/app/hero-detail.component.ts (deleteRequest)" region="deleteRequest">

</code-example>

The component defines a `deleteRequest` property that returns an `EventEmitter`.
When the user clicks *delete*, the component invokes the `delete()` method,
telling the `EventEmitter` to emit a `Hero` object.

组件定义了 `deleteRequest` 属性，它是 `EventEmitter` 实例。
当用户点击*删除*时，组件会调用 `delete()` 方法，让 `EventEmitter` 发出一个 `Hero` 对象。

Now imagine a hosting parent component that binds to the `HeroDetailComponent`'s `deleteRequest` event.

现在，假设有个宿主的父组件，它绑定了 `HeroDetailComponent` 的 `deleteRequest` 事件。

<code-example path="template-syntax/src/app/app.component.html" linenums="false" title="src/app/app.component.html (event-binding-to-component)" region="event-binding-to-component">

</code-example>

When the `deleteRequest` event fires, Angular calls the parent component's `deleteHero` method,
passing the *hero-to-delete* (emitted by `HeroDetail`) in the `$event` variable.

当 `deleteRequest` 事件触发时，Angular 调用父组件的 `deleteHero` 方法，
在 `$event` 变量中传入*要删除的英雄*（来自 `HeroDetail`）。

### Template statements have side effects

### 模板语句有副作用

The `deleteHero` method has a side effect: it deletes a hero.
Template statement side effects are not just OK, but expected.

`deleteHero` 方法有副作用：它删除了一个英雄。
模板语句的副作用不仅没问题，反而正是所期望的。

Deleting the hero updates the model, perhaps triggering other changes
including queries and saves to a remote server.
These changes percolate through the system and are ultimately displayed in this and other views.

删除这个英雄会更新模型，还可能触发其它修改，包括向远端服务器的查询和保存。
这些变更通过系统进行扩散，并最终显示到当前以及其它视图中。

<hr/>

{@a two-way}

## Two-way binding ( <span class="syntax">[(...)]</span> )

## 双向数据绑定 ( <span class="syntax">[(...)]</span> )

You often want to both display a data property and update that property when the user makes changes.

我们经常需要显示数据属性，并在用户作出更改时更新该属性。

On the element side that takes a combination of setting a specific element property
and listening for an element change event.

在元素层面上，既要设置元素属性，又要监听元素事件变化。

Angular offers a special _two-way data binding_ syntax for this purpose, **`[(x)]`**.
The `[(x)]` syntax combines the brackets
of _property binding_, `[x]`, with the parentheses of _event binding_, `(x)`.

Angular 为此提供一种特殊的_双向数据绑定_语法：**`[(x)]`**。
`[(x)]` 语法结合了_属性绑定_的方括号 `[x]` 和_事件绑定_的圆括号 `(x)`。

<div class="callout is-important">

<header>[( )] = banana in a box</header>

<header>[( )] = 盒子里的香蕉</header>

Visualize a *banana in a box* to remember that the parentheses go _inside_ the brackets.

想象*盒子里的香蕉*来记住方括号套圆括号。

</div>

The `[(x)]` syntax is easy to demonstrate when the element has a settable property called `x`
and a corresponding event named `xChange`.
Here's a `SizerComponent` that fits the pattern.
It has a `size` value property and a companion `sizeChange` event:

当一个元素拥有可以设置的属性 `x` 和对应的事件 `xChange` 时，解释 `[(x)]` 语法就容易多了。
下面的 `SizerComponent` 符合这个模式。它有 `size` 属性和伴随的 `sizeChange` 事件：

<code-example path="template-syntax/src/app/sizer.component.ts" title="src/app/sizer.component.ts">

</code-example>

The initial `size` is an input value from a property binding.
Clicking the buttons increases or decreases the `size`, within min/max values constraints,
and then raises (_emits_) the `sizeChange` event with the adjusted size.

`size` 的初始值是一个输入值，来自属性绑定。（译注：注意 `size` 前面的 `@Input`）
点击按钮，在最小/最大值范围限制内增加或者减少 `size`。
然后用调整后的 `size` 触发 `sizeChange` 事件。

Here's an example in which the `AppComponent.fontSizePx` is two-way bound to the `SizerComponent`:

下面的例子中，`AppComponent.fontSize` 被双向绑定到 `SizerComponent`：

<code-example path="template-syntax/src/app/app.component.html" linenums="false" title="src/app/app.component.html (two-way-1)" region="two-way-1">

</code-example>

The `AppComponent.fontSizePx` establishes the initial `SizerComponent.size` value.
Clicking the buttons updates the `AppComponent.fontSizePx` via the two-way binding.
The revised `AppComponent.fontSizePx` value flows through to the _style_ binding,
making the displayed text bigger or smaller.

`SizerComponent.size` 初始值是 `AppComponent.fontSizePx`。
点击按钮时，通过双向绑定更新 `AppComponent.fontSizePx`。
被修改的 `AppComponent.fontSizePx` 通过_样式_绑定，改变文本的显示大小。

The two-way binding syntax is really just syntactic sugar for a _property_ binding and an _event_ binding.
Angular _desugars_ the `SizerComponent` binding into this:

双向绑定语法实际上是_属性_绑定和_事件绑定_的语法糖。
Angular 将 `SizerComponent` 的绑定分解成这样：

<code-example path="template-syntax/src/app/app.component.html" linenums="false" title="src/app/app.component.html (two-way-2)" region="two-way-2">

</code-example>

The `$event` variable contains the payload of the `SizerComponent.sizeChange` event.
Angular assigns the `$event` value to the `AppComponent.fontSizePx` when the user clicks the buttons.

`$event` 变量包含了 `SizerComponent.sizeChange` 事件的荷载。
当用户点击按钮时，Angular 将 `$event` 赋值给 `AppComponent.fontSizePx`。

Clearly the two-way binding syntax is a great convenience compared to separate property and event bindings.

显然，比起单独绑定属性和事件，双向数据绑定语法显得非常方便。

It would be convenient to use two-way binding with HTML form elements like `<input>` and `<select>`.
However, no native HTML element follows the `x` value and `xChange` event pattern.

我们希望能在像 `<input>` 和 `<select>` 这样的 HTML 元素上使用双向数据绑定。
可惜，原生 HTML 元素不遵循 `x` 值和 `xChange` 事件的模式。

Fortunately, the Angular [_NgModel_](guide/template-syntax#ngModel) directive is a bridge that enables two-way binding to form elements.

幸运的是，Angular 以 [_NgModel_](guide/template-syntax#ngModel) 指令为桥梁，允许在表单元素上使用双向数据绑定。

<hr/>

{@a directives}

## Built-in directives

## 内置指令

Earlier versions of Angular included over seventy built-in directives.
The community contributed many more, and countless private directives
have been created for internal applications.

上一版本的 Angular 中包含了超过 70 个内置指令。
  社区贡献了更多，这还没算为内部应用而创建的无数私有指令。

You don't need many of those directives in Angular.
You can often achieve the same results with the more capable and expressive Angular binding system.
Why create a directive to handle a click when you can write a simple binding such as this?

在新版的 Angular 中不需要那么多指令。
  使用更强大、更富有表现力的 Angular 绑定系统，其实可以达到同样的效果。
  如果能用简单的绑定达到目的，为什么还要创建指令来处理点击事件呢？

<code-example path="template-syntax/src/app/app.component.html" region="event-binding-1" title="src/app/app.component.html" linenums="false">

</code-example>

You still benefit from directives that simplify complex tasks.
Angular still ships with built-in directives; just not as many.
You'll write your own directives, just not as many.

我们仍然可以从简化复杂任务的指令中获益。
Angular 发布时仍然带有内置指令，只是没那么多了。
我们仍会写自己的指令，只是没那么多了。

This segment reviews some of the most frequently used built-in directives,
classified as either [_attribute_ directives](guide/template-syntax#attribute-directives) or [_structural_ directives](guide/template-syntax#structural-directives).

下面来看一下那些最常用的内置指令。它们可分为[*属性型*指令](guide/template-syntax#attribute-directives) 或 [*结构型*指令](guide/template-syntax#structural-directives)。

<hr/>

{@a attribute-directives}

## Built-in _attribute_ directives

## 内置*属性型*指令

Attribute directives listen to and modify the behavior of
other HTML elements, attributes, properties, and components.
They are usually applied to elements as if they were HTML attributes, hence the name.

属性型指令会监听和修改其它 HTML 元素或组件的行为、元素属性（Attribute）、DOM 属性（Property）。
它们通常会作为 HTML 属性的名称而应用在元素上。

Many details are covered in the [_Attribute Directives_](guide/attribute-directives) guide.
Many NgModules such as the [`RouterModule`](guide/router "Routing and Navigation")
and the [`FormsModule`](guide/forms "Forms") define their own attribute directives.
This section is an introduction to the most commonly used attribute directives:

更多的细节参见[_属性型指令_](guide/attribute-directives)一章。
很多 Angular 模块，比如[`RouterModule`](guide/router "Routing and Navigation")和[`FormsModule`](guide/forms "Forms")都定义了自己的属性型指令。
本节将会介绍几个最常用的属性型指令：

* [`NgClass`](guide/template-syntax#ngClass) - add and remove a set of CSS classes

   [`NgClass`](guide/template-syntax#ngClass) - 添加或移除一组 CSS 类

* [`NgStyle`](guide/template-syntax#ngStyle) - add and remove a set of HTML styles

   [`NgStyle`](guide/template-syntax#ngStyle) - 添加或移除一组 CSS 样式

* [`NgModel`](guide/template-syntax#ngModel) - two-way data binding to an HTML form element

   [`NgModel`](guide/template-syntax#ngModel) - 双向绑定到 HTML 表单元素

<hr/>

{@a ngClass}

### NgClass

You typically control how elements appear
by adding and removing CSS classes dynamically.
You can bind to the `ngClass` to add or remove several classes simultaneously.

我们经常用动态添加或删除 CSS 类的方式来控制元素如何显示。
通过绑定到 `NgClass`，可以同时添加或移除多个类。

A [class binding](guide/template-syntax#class-binding) is a good way to add or remove a *single* class.

[CSS 类绑定](guide/template-syntax#class-binding) 是添加或删除*单个*类的最佳途径。

<code-example path="template-syntax/src/app/app.component.html" region="class-binding-3a" title="src/app/app.component.html" linenums="false">

</code-example>

To add or remove *many* CSS classes at the same time, the `NgClass` directive may be the better choice.

当想要同时添加或移除*多个* CSS 类时，`NgClass` 指令可能是更好的选择。

Try binding `ngClass` to a key:value control object.
Each key of the object is a CSS class name; its value is `true` if the class should be added,
`false` if it should be removed.

试试把 `ngClass` 绑定到一个 key:value 形式的控制对象。这个对象中的每个 key 都是一个 CSS 类名，如果它的 value 是 `true`，这个类就会被加上，否则就会被移除。

Consider a `setCurrentClasses` component method that sets a component property,
`currentClasses` with an object that adds or removes three classes based on the
`true`/`false` state of three other component properties:

组件方法 `setCurrentClasses` 可以把组件的属性 `currentClasses` 设置为一个对象，它将会根据三个其它组件的状态为 `true` 或 `false` 而添加或移除三个类。

<code-example path="template-syntax/src/app/app.component.ts" region="setClasses" title="src/app/app.component.ts" linenums="false">

</code-example>

Adding an `ngClass` property binding to `currentClasses` sets the element's classes accordingly:

把 `NgClass` 属性绑定到 `currentClasses`，根据它来设置此元素的 CSS 类：

<code-example path="template-syntax/src/app/app.component.html" region="NgClass-1" title="src/app/app.component.html" linenums="false">

</code-example>

<div class="l-sub-section">

It's up to you to call `setCurrentClasses()`, both initially and when the dependent properties change.

你既可以在初始化时调用 `setCurrentClassess()`，也可以在所依赖的属性变化时调用。

</div>

<hr/>

{@a ngStyle}

### NgStyle

You can set inline styles dynamically, based on the state of the component.
With `NgStyle` you can set many inline styles simultaneously.

我们可以根据组件的状态动态设置内联样式。
`NgStyle` 绑定可以同时设置多个内联样式。

A [style binding](guide/template-syntax#style-binding) is an easy way to set a *single* style value.

[样式绑定](guide/template-syntax#style-binding)是设置*单一*样式值的简单方式。

<code-example path="template-syntax/src/app/app.component.html" region="NgStyle-1" title="src/app/app.component.html" linenums="false">

</code-example>

To set *many* inline styles at the same time, the `NgStyle` directive may be the better choice.

如果要同时设置*多个*内联样式，`NgStyle` 指令可能是更好的选择。

Try binding `ngStyle` to a key:value control object.
Each key of the object is a style name; its value is whatever is appropriate for that style.

`NgStyle` 需要绑定到一个 key:value 控制对象。
  对象的每个 key 是样式名，它的 value 是能用于这个样式的任何值。

Consider a `setCurrentStyles` component method that sets a component property, `currentStyles`
with an object that defines three styles, based on the state of three other component properties:

来看看组件的 `setCurrentStyles` 方法，它会根据另外三个属性的状态把组件的 `currentStyles` 属性设置为一个定义了三个样式的对象：

<code-example path="template-syntax/src/app/app.component.ts" region="setStyles" title="src/app/app.component.ts" linenums="false">

</code-example>

Adding an `ngStyle` property binding to `currentStyles` sets the element's styles accordingly:

把 `NgStyle` 属性绑定到 `currentStyles`，以据此设置此元素的样式：

<code-example path="template-syntax/src/app/app.component.html" region="NgStyle-2" title="src/app/app.component.html" linenums="false">

</code-example>

<div class="l-sub-section">

It's up to you to call `setCurrentStyles()`, both initially and when the dependent properties change.

你既可以在初始化时调用 `setCurrentStyles()`，也可以在所依赖的属性变化时调用。

</div>

<hr/>

{@a ngModel}

### NgModel - Two-way binding to form elements with <span class="syntax">[(ngModel)]</span>

### NgModel - 使用<span class="syntax">[(ngModel)]</span>双向绑定到表单元素

When developing data entry forms, you often both display a data property and
update that property when the user makes changes.

当开发数据输入表单时，我们通常都要既显示数据属性又根据用户的更改去修改那个属性。

Two-way data binding with the `NgModel` directive makes that easy. Here's an example:

使用 `NgModel` 指令进行双向数据绑定可以简化这种工作。例子如下：

<code-example path="template-syntax/src/app/app.component.html" linenums="false" title="src/app/app.component.html (NgModel-1)" region="NgModel-1">

</code-example>

#### _FormsModule_ is required to use _ngModel_

#### 使用 `ngModel` 时需要 `FormsModule`

Before using the `ngModel` directive in a two-way data binding,
you must import the `FormsModule` and add it to the NgModule's `imports` list.
Learn more about the `FormsModule` and `ngModel` in the
[Forms](guide/forms#ngModel) guide.

在使用 `ngModel` 指令进行双向数据绑定之前，我们必须导入 `FormsModule` 并把它添加到 Angular 模块的 `imports` 列表中。
要了解 `FormsModule` 和 `ngModel` 的更多知识，参见[表单](guide/forms#ngModel)一章。

Here's how to import the `FormsModule` to make `[(ngModel)]` available.

导入 `FormsModule` 并让 `[(ngModel)]` 可用的代码如下：

<code-example path="template-syntax/src/app/app.module.1.ts" linenums="false" title="src/app/app.module.ts (FormsModule import)">

</code-example>

#### Inside <span class="syntax">[(ngModel)]</span>

#### <span class="syntax">[(ngModel)]</span>内幕

Looking back at the `name` binding, note that
you could have achieved the same result with separate bindings to
the `<input>` element's  `value` property and `input` event.

回头看看 `name` 绑定，注意，你可以通过分别绑定到 `<input>` 元素的 `value` 属性和 `input` 事件来达到同样的效果。

<code-example path="template-syntax/src/app/app.component.html" region="without-NgModel" title="src/app/app.component.html" linenums="false">

</code-example>

That's cumbersome. Who can remember which element property to set and which element event emits user changes?
How do you extract the currently displayed text from the input box so you can update the data property?
Who wants to look that up each time?

那样显得很笨重，谁会记得该设置哪个元素属性以及当用户修改时触发哪个事件？
你该如何提取输入框中的文本并且更新数据属性？谁会希望每次都去查资料来确定这些？

That `ngModel` directive hides these onerous details behind its own  `ngModel` input and `ngModelChange` output properties.

`ngModel` 指令通过自己的输入属性 `ngModel` 和输出属性 `ngModelChange` 隐藏了那些细节。

<code-example path="template-syntax/src/app/app.component.html" region="NgModel-3" title="src/app/app.component.html" linenums="false">

</code-example>

<div class="l-sub-section">

The `ngModel` data property sets the element's value property and the `ngModelChange` event property
listens for changes to the element's value.

`ngModel` 输入属性会设置该元素的值，并通过 `ngModelChange` 的输出属性来监听元素值的变化。

The details are specific to each kind of element and therefore the `NgModel` directive only works for an element
supported by a [ControlValueAccessor](api/forms/ControlValueAccessor)
that adapts an element to this protocol.
The `<input>` box is one of those elements.
Angular provides *value accessors* for all of the basic HTML form elements and the
[_Forms_](guide/forms) guide shows how to bind to them.

各种元素都有很多特有的处理细节，因此 `NgModel` 指令只支持实现了[ControlValueAccessor](api/forms/ControlValueAccessor)的元素，
它们能让元素适配本协议。
`<input>` 输入框正是其中之一。
Angular 为所有的基础 HTML 表单都提供了*值访问器（Value accessor）*，[*表单*](guide/forms)一章展示了如何绑定它们。

You can't apply `[(ngModel)]` to a non-form native element or a third-party custom component
until you write a suitable *value accessor*,
a technique that is beyond the scope of this guide.

我们不能把 `[(ngModel)]` 用到非表单类的原生元素或第三方自定义组件上，除非写一个合适的*值访问器*，这种技巧超出了本章的范围。

You don't need a _value accessor_ for an Angular component that you write because you
can name the value and event properties
to suit Angular's basic [two-way binding syntax](guide/template-syntax#two-way) and skip `NgModel` altogether.
The [`sizer` shown above](guide/template-syntax#two-way) is an example of this technique.

我们自己写的 Angular 组件不需要*值访问器*，因为我们可以让值和事件的属性名适应 Angular 基本的[双向绑定语法](guide/template-syntax#two-way)，而不使用 `NgModel`。
[前面看过的 `sizer`](guide/template-syntax#two-way)就是使用这种技巧的例子。

</div>

Separate `ngModel` bindings is an improvement over binding to the element's native properties. You can do better.

使用独立的 `ngModel` 绑定优于绑定到该元素的原生属性，那样我们可以做得更好。

You shouldn't have to mention the data property twice. Angular should be able to capture
the component's data property and set it
with a single declaration, which it can with the `[(ngModel)]` syntax:

我们不用被迫两次引用这个数据属性，Angular 可以捕获该元素的数据属性，并且通过一个简单的声明来设置它，这样它就可以使用 `[(ngModel)]` 语法了。

<code-example path="template-syntax/src/app/app.component.html" region="NgModel-1" title="src/app/app.component.html" linenums="false">

</code-example>

Is `[(ngModel)]` all you need? Is there ever a reason to fall back to its expanded form?

`[(ngModel)]` 就是你需要的一切吗？有没有什么理由回退到它的展开形式？

The `[(ngModel)]` syntax can only _set_ a data-bound property.
If you need to do something more or something different, you can write the expanded form.

`[(ngModel)]` 语法只能*设置*数据绑定属性。
如果要做更多或者做点不一样的事，也可以写它的展开形式。

The following contrived example forces the input value to uppercase:

下面这个生造的例子强制输入框的内容变成大写：

<code-example path="template-syntax/src/app/app.component.html" region="NgModel-4" title="src/app/app.component.html" linenums="false">

</code-example>

Here are all variations in action, including the uppercase version:

这里是所有这些变体的动画，包括这个大写转换的版本：

<figure>
  <img src='generated/images/guide/template-syntax/ng-model-anim.gif' alt="NgModel variations">
</figure>

<hr/>

{@a structural-directives}

## Built-in _structural_ directives

## 内置*结构型*指令

Structural directives are responsible for HTML layout.
They shape or reshape the DOM's _structure_, typically by adding, removing, and manipulating
the host elements to which they are attached.

结构型指令的职责是 HTML 布局。
它们塑造或重塑 DOM 的*结构*，这通常是通过添加、移除和操纵它们所附加到的宿主元素来实现的。

The deep details of structural directives are covered in the
[_Structural Directives_](guide/structural-directives) guide
where you'll learn:

关于结构型指令的详情参见[*结构型指令*](guide/structural-directives)一章，在那里我们将学到：

* why you
[_prefix the directive name with an asterisk_ (\*)](guide/structural-directives#asterisk "The * in *ngIf").

   为什么要[给结构型指令的名字加上(\*)前缀？](guide/structural-directives#asterisk "The * in *ngIf")

* to use [`<ng-container>`](guide/structural-directives#ngcontainer "<ng-container>")
to group elements when there is no suitable host element for the directive.

   当没有合适的宿主元素放置指令时，可用 [`<ng-container>`](guide/structural-directives#ngcontainer "<ng-container>") 对元素进行分组。

* how to write your own structural directive.

   如何写自己的结构型指令。

* that you can only apply [one structural directive](guide/structural-directives#one-per-element "one per host element") to an element.

   我们只能往一个元素上应用[一个结构型指令](guide/structural-directives#one-per-element "one per host element")。

_This_ section is an introduction to the common structural directives:

*本节*是对常见结构型指令的简介：

* [`NgIf`](guide/template-syntax#ngIf) - conditionally add or remove an element from the DOM

   [`NgIf`](guide/template-syntax#ngIf) - 根据条件把一个元素添加到 DOM 中或从 DOM 移除

* [`NgSwitch`](guide/template-syntax#ngSwitch) - a set of directives that switch among alternative views

   [`NgSwitch`](guide/template-syntax#ngSwitch) 一组指令，用来在多个可选视图之间切换。

* [NgForOf](guide/template-syntax#ngFor) - repeat a template for each item in a list

   [NgForOf](guide/template-syntax#ngFor) - 对列表中的每个条目重复套用同一个模板

<hr/>

{@a ngIf}

### NgIf

You can add or remove an element from the DOM by applying an `NgIf` directive to
that element (called the _host element_).
Bind the directive to a condition expression like `isActive` in this example.

通过把 `NgIf` 指令应用到元素上（称为*宿主元素*），我们可以往 DOM 中添加或从 DOM 中移除这个元素。
在下面的例子中，该指令绑定到了类似于 `isActive` 这样的条件表达式。

<code-example path="template-syntax/src/app/app.component.html" region="NgIf-1" title="src/app/app.component.html" linenums="false">

</code-example>

<div class="alert is-critical">

Don't forget the asterisk (`*`) in front of `ngIf`.

别忘了 `ngIf` 前面的星号(`*`)。

</div>

When the `isActive` expression returns a truthy value, `NgIf` adds the `HeroDetailComponent` to the DOM.
When the expression is falsy, `NgIf` removes the `HeroDetailComponent`
from the DOM, destroying that component and all of its sub-components.

当 `isActive` 表达式返回真值时，`NgIf` 把 `HeroDetailComponent` 添加到 DOM 中；为假时，`NgIf` 会从 DOM 中移除 `HeroDetailComponent`，并销毁该组件及其所有子组件。

#### Show/hide is not the same thing

#### 这和显示/隐藏不是一回事

You can control the visibility of an element with a
[class](guide/template-syntax#class-binding) or [style](guide/template-syntax#style-binding) binding:

我们也可以通过[类绑定](guide/template-syntax#class-binding)或[样式绑定](guide/template-syntax#style-binding)来显示或隐藏一个元素。

<code-example path="template-syntax/src/app/app.component.html" region="NgIf-3" title="src/app/app.component.html" linenums="false">

</code-example>

Hiding an element is quite different from removing an element with `NgIf`.

但隐藏子树和用 `NgIf` 排除子树是截然不同的。

When you hide an element, that element and all of its descendents remain in the DOM.
All components for those elements stay in memory and
Angular may continue to check for changes.
You could be holding onto considerable computing resources and degrading performance,
for something the user can't see.

当隐藏子树时，它仍然留在 DOM 中。
子树中的组件及其状态仍然保留着。
即使对于不可见属性，Angular 也会继续检查变更。
子树可能占用相当可观的内存和运算资源。

When `NgIf` is `false`, Angular removes the element and its descendents from the DOM.
It destroys their components, potentially freeing up substantial resources,
resulting in a more responsive user experience.

当 `NgIf` 为 `false` 时，Angular 从 DOM 中物理地移除了这个元素子树。
它销毁了子树中的组件及其状态，也潜在释放了可观的资源，最终让用户体验到更好的性能。

The show/hide technique is fine for a few elements with few children.
You should be wary when hiding large component trees; `NgIf` may be the safer choice.

显示/隐藏的技术对于只有少量子元素的元素是很好用的，但要当心别试图隐藏大型组件树。相比之下，`NgIf` 则是个更安全的选择。

#### Guard against null

#### 防范空指针错误

The `ngIf` directive is often used to guard against null.
Show/hide is useless as a guard.
Angular will throw an error if a nested expression tries to access a property of `null`.

`ngIf` 指令通常会用来防范空指针错误。
而显示/隐藏的方式是无法防范的，当一个表达式尝试访问空值的属性时，Angular 就会抛出一个异常。

Here we see `NgIf` guarding two `<div>`s.
The `currentHero` name will appear only when there is a `currentHero`.
The `nullHero` will never be displayed.

这里我们用 `NgIf` 来保护了两个 `<div>` 防范空指针错误。
`currentHero` 的名字只有当存在 `currentHero` 时才会显示出来。
而 `nullHero` 永远不会显示。

<code-example path="template-syntax/src/app/app.component.html" region="NgIf-2" title="src/app/app.component.html" linenums="false">

</code-example>

<div class="l-sub-section">

See also the
[_safe navigation operator_](guide/template-syntax#safe-navigation-operator "Safe navigation operator (?.)")
described below.

参见稍后的[_安全导航操作符_](guide/template-syntax#safe-navigation-operator "Safe naviation operator (?.)")部分。

</div>

<hr/>

{@a ngFor}

### NgForOf

`NgForOf` is a _repeater_ directive &mdash; a way to present a list of items.
You define a block of HTML that defines how a single item should be displayed.
You tell Angular to use that block as a template for rendering each item in the list.

`NgFor` 是一个_重复器_指令 —— 自定义数据显示的一种方式。
我们的目标是展示一个由多个条目组成的列表。首先定义了一个 HTML 块，它规定了单个条目应该如何显示。
再告诉 Angular 把这个块当做模板，渲染列表中的每个条目。

Here is an example of `NgForOf` applied to a simple `<div>`:

下例中，`NgFor` 应用在一个简单的 `<div>` 上：

<code-example path="template-syntax/src/app/app.component.html" region="NgFor-1" title="src/app/app.component.html" linenums="false">

</code-example>

You can also apply an `NgForOf` to a component element, as in this example:

也可以把 `NgFor` 应用在一个组件元素上，就下例这样：

<code-example path="template-syntax/src/app/app.component.html" region="NgFor-2" title="src/app/app.component.html" linenums="false">

</code-example>

<div class="alert is-critical">

Don't forget the asterisk (`*`) in front of `ngFor`.

不要忘了 `ngFor` 前面的星号 (`*`)。

</div>

The text assigned to `*ngFor` is the instruction that guides the repeater process.

赋值给 `*ngFor` 的文本是用于指导重复器如何工作的指令。

{@a microsyntax}

#### *ngFor microsyntax

#### NgFor 微语法

The string assigned to `*ngFor` is not a [template expression](guide/template-syntax#template-expressions).
It's a *microsyntax* &mdash; a little language of its own that Angular interprets.
The string `"let hero of heroes"` means:

赋值给 `*ngFor` 的字符串不是[模板表达式](guide/template-syntax#template-expressions)。
它是一个*微语法* —— 由 Angular 自己解释的小型语言。在这个例子中，字符串 `"let hero of heroes"` 的含义是：

> *Take each hero in the `heroes` array, store it in the local `hero` looping variable, and
make it available to the templated HTML for each iteration.*

> *取出 `heroes` 数组中的每个英雄，把它存入局部变量 `hero` 中，并在每次迭代时对模板 HTML 可用*

Angular translates this instruction into a `<ng-template>` around the host element,
then uses this template repeatedly to create a new set of elements and bindings for each `hero`
in the list.

Angular 把这个指令翻译成了一个 `<ng-template>` 包裹的宿主元素，然后使用这个模板重复创建出一组新元素，并且绑定到列表中的每一个 `hero`。

Learn about the _microsyntax_ in the [_Structural Directives_](guide/structural-directives#microsyntax) guide.

要了解*微语法*的更多知识，参见[_结构型指令_](guide/structural-directives#microsyntax)一章。

{@a template-input-variable}

{@a template-input-variables}

### Template input variables

### 模板输入变量

The `let` keyword before `hero` creates a _template input variable_ called `hero`.
The `NgForOf` directive iterates over the `heroes` array returned by the parent component's `heroes` property
and sets `hero` to the current item from the array during each iteration.

`hero` 前的 `let` 关键字创建了一个名叫 `hero` 的*模板输入变量*。
`ngFor` 指令在由父组件的 `heroes` 属性返回的 `heroes` 数组上迭代，每次迭代都从数组中把当前元素赋值给 `hero` 变量。

You reference the `hero` input variable within the `NgForOf` host element
(and within its descendants) to access the hero's properties.
Here it is referenced first in an interpolation
and then passed in a binding to the `hero` property of the `<hero-detail>` component.

我们可以在 `ngFor` 的宿主元素（及其子元素）中引用模板输入变量 `hero`，从而访问该英雄的属性。
这里它首先在一个插值表达式中被引用到，然后通过一个绑定把它传给了 `<hero-detail>` 组件的 `hero` 属性。

<code-example path="template-syntax/src/app/app.component.html" region="NgFor-1-2" title="src/app/app.component.html" linenums="false">

</code-example>

Learn more about _template input variables_ in the
[_Structural Directives_](guide/structural-directives#template-input-variable) guide.

要了解更多*模板输入变量*的知识，参见[*结构型指令*](guide/structural-directives#template-input-variable)一章。

#### *ngFor with _index_

#### 带索引的 `*ngFor`

The `index` property of the `NgForOf` directive context returns the zero-based index of the item in each iteration.
You can capture the `index` in a template input variable and use it in the template.

`NgFor` 指令上下文中的 `index` 属性返回一个从零开始的索引，表示当前条目在迭代中的顺序。
我们可以通过模板输入变量捕获这个 `index` 值，并把它用在模板中。

The next example captures the `index` in a variable named `i` and displays it with the hero name like this.

下面这个例子把 `index` 捕获到了 `i` 变量中，并且把它显示在英雄名字的前面。

<code-example path="template-syntax/src/app/app.component.html" region="NgFor-3" title="src/app/app.component.html" linenums="false">

</code-example>

<div class="l-sub-section">

`NgFor` is implemented by the `NgForOf` directive. Read more about the other `NgForOf` context values such as `last`, `even`,
and `odd` in the [NgForOf API reference](api/common/NgForOf).

要学习更多的*类似 index* 的值，例如 `last`、`even` 和 `odd`，请参阅 [NgFor API 参考](api/common/NgForOf)。

</div>

{@a trackBy}

#### *ngFor with _trackBy_

#### 带 `trackBy` 的 `*ngFor`

The `NgForOf` directive may perform poorly, especially with large lists.
A small change to one item, an item removed, or an item added can trigger a cascade of DOM manipulations.

`ngFor` 指令有时候会性能较差，特别是在大型列表中。
对一个条目的一丁点改动、移除或添加，都会导致级联的 DOM 操作。

For example, re-querying the server could reset the list with all new hero objects.

例如，我们可以通过重新从服务器查询来刷新英雄列表。
  刷新后的列表可能包含很多（如果不是全部的话）以前显示过的英雄。

Most, if not all, are previously displayed heroes.
*You* know this because the `id` of each hero hasn't changed.
But Angular sees only a fresh list of new object references.
It has no choice but to tear down the old DOM elements and insert all new DOM elements.

他们中的绝大多数（如果不是所有的话）都是以前显示过的英雄。*我们*知道这一点，是因为每个英雄的 `id` 没有变化。
  但在 Angular 看来，它只是一个由新的对象引用构成的新列表，
  它没有选择，只能清理旧列表、舍弃那些 DOM 元素，并且用新的 DOM 元素来重建一个新列表。

Angular can avoid this churn with `trackBy`.
Add a method to the component that returns the value `NgForOf` _should_ track.
In this case, that value is the hero's `id`.

如果给它指定一个 `trackBy`，Angular 就可以避免这种折腾。
  我们往组件中添加一个方法，它会返回 `NgFor`*应该*追踪的值。
  在这里，这个值就是英雄的 `id`。

<code-example path="template-syntax/src/app/app.component.ts" region="trackByHeroes" title="src/app/app.component.ts" linenums="false">

</code-example>

In the microsyntax expression, set `trackBy` to this method.

在微语法中，把 `trackBy` 设置为该方法。

<code-example path="template-syntax/src/app/app.component.html" region="trackBy" title="src/app/app.component.html" linenums="false">

</code-example>

Here is an illustration of the _trackBy_ effect.
"Reset heroes" creates new heroes with the same `hero.id`s.
"Change ids" creates new heroes with new `hero.id`s.

这里展示了 `trackBy` 的效果。
"Reset heroes"会创建一个具有相同 `hero.id` 的新英雄。
"Change ids"则会创建一个具有新 `hero.id` 的新英雄。

* With no `trackBy`, both buttons trigger complete DOM element replacement.

   如果没有 `trackBy`，这些按钮都会触发完全的 DOM 元素替换。

* With `trackBy`, only changing the `id` triggers element replacement.

   有了 `trackBy`，则只有修改了 `id` 的按钮才会触发元素替换。

<figure>
  <img src="generated/images/guide/template-syntax/ng-for-track-by-anim.gif" alt="trackBy">
</figure>

<hr/>

{@a ngSwitch}

### The _NgSwitch_ directives

### `NgSwitch` 指令

*NgSwitch* is like the JavaScript `switch` statement.
It can display _one_ element from among several possible elements, based on a _switch condition_.
Angular puts only the *selected* element into the DOM.

`NgSwitch` 指令类似于 JavaScript 的 `switch` 语句。
它可以从多个可能的元素中根据*switch 条件*来显示某一个。
Angular 只会把*选中的*元素放进 DOM 中。

*NgSwitch* is actually a set of three, cooperating directives:
`NgSwitch`, `NgSwitchCase`, and `NgSwitchDefault` as seen in this example.

`NgSwitch` 实际上包括三个相互协作的指令：`NgSwitch`、`NgSwitchCase` 和 `NgSwitchDefault`，例子如下：

<code-example path="template-syntax/src/app/app.component.html" region="NgSwitch" title="src/app/app.component.html" linenums="false">

</code-example>

<figure>
  <img src="generated/images/guide/template-syntax/switch-anim.gif" alt="trackBy">
</figure>

`NgSwitch` is the controller directive. Bind it to an expression that returns the *switch value*.
The `emotion` value in this example is a string, but the switch value can be of any type.

`NgSwitch` 是主控指令，要把它绑定到一个返回*候选值*的表达式。
本例子中的 `emotion` 是个字符串，但实际上这个候选值可以是任意类型。

**Bind to `[ngSwitch]`**. You'll get an error if you try to set `*ngSwitch` because
`NgSwitch` is an *attribute* directive, not a *structural* directive.
It changes the behavior of its companion directives.
It doesn't touch the DOM directly.

**绑定到 `[ngSwitch]`**。如果试图用 `*ngSwitch` 的形式使用它就会报错，这是因为 `NgSwitch` 是一个*属性型*指令，而不是*结构型指令*。
它要修改的是所在元素的行为，而不会直接接触 DOM 结构。

**Bind to `*ngSwitchCase` and `*ngSwitchDefault`**.
The `NgSwitchCase` and `NgSwitchDefault` directives are _structural_ directives
because they add or remove elements from the DOM.

**绑定到 `*ngSwitchCase` 和 `*ngSwitchDefault`**
`NgSwitchCase` 和 `NgSwitchDefault` 指令都是*结构型指令*，因为它们会从 DOM 中添加或移除元素。

* `NgSwitchCase` adds its element to the DOM when its bound value equals the switch value.

   `NgSwitchCase` 会在它绑定到的值等于候选值时，把它所在的元素加入到 DOM 中。

* `NgSwitchDefault` adds its element to the DOM when there is no selected `NgSwitchCase`.

   `NgSwitchDefault` 会在没有任何一个 `NgSwitchCase` 被选中时把它所在的元素加入 DOM 中。

The switch directives are particularly useful for adding and removing *component elements*.
This example switches among four "emotional hero" components defined in the `hero-switch.components.ts` file.
Each component has a `hero` [input property](guide/template-syntax#inputs-outputs "Input property")
which is bound to the `currentHero` of the parent component.

这组指令在要添加或移除*组件元素*时会非常有用。
这个例子会在 `hero-switch.components.ts` 中定义的四个“感人英雄”组件之间选择。
每个组件都有一个[输入属性](guide/template-syntax#inputs-outputs "Input property")`hero`，它绑定到父组件的 `currentHero` 上。

Switch directives work as well with native elements and web components too.
For example, you could replace the `<confused-hero>` switch case with the following.

这组指令在原生元素和<a href="https://developer.mozilla.org/en-US/docs/Web/Web_Components" target="_blank" title="MDN: Web Components">Web Component</a>上都可以正常工作。
比如，你可以把 `<confused-hero>` 分支改成这样：

<code-example path="template-syntax/src/app/app.component.html" region="NgSwitch-div" title="src/app/app.component.html" linenums="false">

</code-example>

<hr/>

{@a template-reference-variable}

{@a ref-vars}

{@a ref-var}

## Template reference variables ( <span class="syntax">#var</span> )

## 模板引用变量 ( <span class="syntax">#var</span> )

A **template reference variable** is often a reference to a DOM element within a template.
It can also be a reference to an Angular component or directive or a
<a href="https://developer.mozilla.org/en-US/docs/Web/Web_Components" title="MDN: Web Components">web component</a>.

**模板引用变量**通常用来引用模板中的某个 DOM 元素，它还可以引用 Angular 组件或指令或<a href="https://developer.mozilla.org/en-US/docs/Web/Web_Components" target="_blank" title="MDN: Web Components">Web Component</a>。

Use the hash symbol (#) to declare a reference variable.
The `#phone` declares a `phone` variable on an `<input>` element.

使用井号 (#) 来声明引用变量。
`#phone` 的意思就是声明一个名叫 `phone` 的变量来引用 `<input>` 元素。

<code-example path="template-syntax/src/app/app.component.html" region="ref-var" title="src/app/app.component.html" linenums="false">

</code-example>

You can refer to a template reference variable _anywhere_ in the template.
The `phone` variable declared on this `<input>` is
consumed in a `<button>` on the other side of the template

我们可以在模板中的任何地方引用模板引用变量。
比如声明在 `<input>` 上的 `phone` 变量就是在模板另一侧的 `<button>` 上使用的。

<code-example path="template-syntax/src/app/app.component.html" region="ref-phone" title="src/app/app.component.html" linenums="false">

</code-example>

<h3 class="no-toc">How a reference variable gets its value</h3>

<h3 class="no-toc">模板引用变量怎么得到它的值？</h3>

In most cases, Angular sets the reference variable's value to the element on which it was declared.
In the previous example, `phone` refers to the _phone number_ `<input>` box.
The phone button click handler passes the _input_ value to the component's `callPhone` method.
But a directive can change that behavior and set the value to something else, such as itself.
The `NgForm` directive does that.

大多数情况下，Angular 会把模板引用变量的值设置为声明它的那个元素。
在上一个例子中，`phone` 引用的是表示*电话号码*的 `<input>` 框。
"拨号"按钮的点击事件处理器把这个*input*值传给了组件的 `callPhone` 方法。
不过，指令也可以修改这种行为，让这个值引用到别处，比如它自身。
`NgForm` 指令就是这么做的。

The following is a *simplified* version of the form example in the [Forms](guide/forms) guide.

下面是[表单](guide/forms)一章中表单范例的*简化版*。

<code-example path="template-syntax/src/app/hero-form.component.html" title="src/app/hero-form.component.html" linenums="false">

</code-example>

A template reference variable, `heroForm`, appears three times in this example, separated
by a large amount of HTML.
What is the value of `heroForm`?

模板引用变量 `heroForm` 在这个例子中出现了三次，中间隔着一大堆 HTML。
`heroForm` 的值是什么？

If Angular hadn't taken it over when you imported the `FormsModule`,
it would be the [HTMLFormElement](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement).
The `heroForm` is actually a reference to an Angular [NgForm](api/forms/NgForm "API: NgForm")
directive with the ability to track the value and validity of every control in the form.

如果你没有导入过 `FormsModule`，Angular 就不会控制这个表单，那么它就是一个[HTMLFormElement](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement)实例。
这里的 `heroForm` 实际上是一个 Angular [NgForm](api/forms/NgForm "API: NgForm") 指令的引用，
因此具备了跟踪表单中的每个控件的值和有效性的能力。

The native `<form>` element doesn't have a `form` property.
But the `NgForm` directive does, which explains how you can disable the submit button
if the `heroForm.form.valid` is invalid and pass the entire form control tree
to the parent component's `onSubmit` method.

原生的 `<form>` 元素没有 `form` 属性，但 `NgForm` 指令有。这就解释了为何当 `heroForm.form.valid` 是无效时我们可以禁用提交按钮，
并能把整个表单控件树传给父组件的 `onSubmit` 方法。

<h3 class="no-toc">Template reference variable warning notes</h3>

<h3 class="no-toc">关于模板引用变量的注意事项</h3>

A template _reference_ variable (`#phone`) is _not_ the same as a template _input_ variable (`let phone`)
such as you might see in an [`*ngFor`](guide/template-syntax#template-input-variable).
Learn the difference in the [_Structural Directives_](guide/structural-directives#template-input-variable) guide.

模板*引用*变量 (`#phone`) 和[`*ngFor`](guide/template-syntax#template-input-variable)部分看到过的模板*输入*变量 (`let phone`) 是不同的。
要了解详情，参见[结构型指令](guide/structural-directives#template-input-variable)一章。

The scope of a reference variable is the _entire template_.
Do not define the same variable name more than once in the same template.
The runtime value will be unpredictable.

模板引用变量的作用范围是*整个模板*。
不要在同一个模板中多次定义同一个变量名，否则它在运行期间的值是无法确定的。

You can use the `ref-` prefix alternative to `#`.
This example declares the `fax` variable as `ref-fax` instead of `#fax`.

我们也可以用 `ref-` 前缀代替 `#`。
下面的例子中就用把 `fax` 变量声明成了 `ref-fax` 而不是 `#fax`。

<code-example path="template-syntax/src/app/app.component.html" region="ref-fax" title="src/app/app.component.html" linenums="false">

</code-example>

<hr/>

{@a inputs-outputs}

## Input and Output properties

## 输入和输出属性

An _Input_ property is a _settable_ property annotated with an `@Input` decorator.
Values flow _into_ the property when it is data bound with a [property binding](#property-binding)

**输入**属性是一个带有 `@Input` 装饰器的**可设置**属性。当它通过[属性绑定](#property-binding)的形式被绑定时，值会“流入”这个属性。

An _Output_ property is an _observable_ property annotated with an `@Output` decorator.
The property almost always returns an Angular [`EventEmitter`](api/core/EventEmitter).
Values flow _out_ of the component as events bound with an [event binding](#event-binding).

**输出**属性是一个带有 `@Output` 装饰器的**可观察对象**型的属性。
这个属性几乎总是返回 Angular 的[`EventEmitter`](api/core/EventEmitter)。
当它通过[事件绑定](#event-binding)的形式被绑定时，值会“流出”这个属性。

You can only bind to _another_ component or directive through its _Input_ and _Output_ properties.

我们只能通过它的**输入**和**输出**属性将其绑定到**其它**组件。

<div class="alert is-important">

Remember that all **components** are **directives**.

记住，所有的**组件**都是**指令**。

The following discussion refers to _components_ for brevity and 
because this topic is mostly a concern for component authors. 

为简洁起见，以下讨论会涉及到**组件**，因为这个主题主要是组件作者所关心的问题。

</div>

<h3 class="no-toc">Discussion</h3>

<h3 class="no-toc">讨论</h3>

You are usually binding a template to its _own component class_.
In such binding expressions, the component's property or method is to the _right_ of the (`=`).

在下面的例子中，`iconUrl` 和 `onSave` 是组件的成员，它们在 `=` 右侧引号语法中被引用了。

<code-example path="template-syntax/src/app/app.component.html" region="io-1" title="src/app/app.component.html" linenums="false">

</code-example>

The `iconUrl` and `onSave` are members of the `AppComponent` class.
They are _not_ decorated with `@Input()` or `@Output`.
Angular does not object.

`iconUrl` 和 `onSave` 是 `AppComponent` 类的成员。但它们并没有带 `@Input()` 或 `@Output()` 装饰器。
Angular 不在乎。

**You can always bind to a public property of a component in its own template.**
It doesn't have to be an _Input_ or _Output_ property

**你总是可以在组件自己的模板中绑定到组件的公共属性，**而不用管它们是否输入（Input）属性或输出（Output）属性。

A component's class and template are closely coupled.
They are both parts of the same thing.
Together they _are_ the component.
Exchanges between a component class and its template are internal implementation details.

这是因为组件类和模板是紧耦合的，它们是同一个东西的两个部分，合起来构成组件。
组件类及其模板之间的交互属于实现细节。

### Binding to a different component

### 绑定到其它组件

You can also bind to a property of a _different_ component.
In such bindings, the _other_ component's property is to the _left_ of the (`=`).

你也可以绑定到*其它*组件的属性。
这种绑定形式下，*其它*组件的属性位于等号（`=`）的*左侧*。

In the following example, the `AppComponent` template binds `AppComponent` class members to properties of the `HeroDetailComponent` whose selector is `'app-hero-detail'`.

下面的例子中，`AppComponent` 的模板把 `AppComponent` 类的成员绑定到了 `HeroDetailComponent`（选择器为 `'app-hero-detail'`） 的属性上。

<code-example path="template-syntax/src/app/app.component.html" region="io-2" title="src/app/app.component.html" linenums="false">

</code-example>

The Angular compiler _may_ reject these bindings with errors like this one:

Angular 的编译器*可能*会对这些绑定报错，就像这样：

<code-example language="sh" class="code-shell">

Uncaught Error: Template parse errors:
Can't bind to 'hero' since it isn't a known property of 'app-hero-detail'

</code-example>

You know that `HeroDetailComponent` has `hero` and `deleteRequest` properties.
But the Angular compiler refuses to recognize them.

你自己知道 `HeroDetailComponent` 有两个属性 `hero` 和 `detectRequest`，但 Angular 编译器并不知道。

**The Angular compiler won't bind to properties of a different component
unless they are Input or Output properties**.

**Angular 编译器不会绑定到其它组件的属性上  —— 除非这些属性是输入或输出属性。**

There's a good reason for this rule.

这条规则是有充分理由的。

It's OK for a component to bind to its _own_ properties.
The component author is in complete control of those bindings.

组件绑定到它*自己*的属性当然没问题。
该组件的作者对这些绑定有完全的控制权。

But other components shouldn't have that kind of unrestricted access.
You'd have a hard time supporting your component if anyone could bind to any of its properties.
Outside components should only be able to bind to the component's public binding API.

但是，其它组件不应该进行这种毫无限制的访问。
如果任何人都可以绑定到你的组件的任何属性上，那么这个组件就很难维护。
所以，外部组件应该只能绑定到组件的公共（允许绑定） API 上。

Angular asks you to be _explicit_ about that API.
It's up to _you_ to decide which properties are available for binding by
external components.

Angular 要求你*显式声明*那些 API。
它让*你*可以自己决定哪些属性是可以被外部组件绑定的。

#### TypeScript _public_ doesn't matter

#### TypeScript 的 `public` 是没用的

You can't use the TypeScript _public_ and _private_ access modifiers to
shape the component's public binding API.

你不能用 TypeScript 的 `public` 和 `private` 访问控制符来标明组件的公共 API。

<div class="alert is-important">

All data bound properties must be TypeScript _public_ properties.
Angular never binds to a TypeScript _private_ property.

所有数据绑定属性必须是 TypeScript 的公共属性，Angular 永远不会绑定到 TypeScript 中的私有属性。

</div>

Angular requires some other way to identify properties that _outside_ components are allowed to bind to.
That _other way_ is the `@Input()` and `@Output()` decorators.

因此，Angular 需要一些其它方式来标记出那些允许被*外部*组件绑定到的属性。
这种*其它方式*，就是 `@Input()` 和 `@Output()` 装饰器。

### Declaring Input and Output properties

### 声明输入与输出属性

In the sample for this guide, the bindings to `HeroDetailComponent` do not fail
because the data bound properties are annotated with `@Input()` and `@Output()` decorators.

在本章的例子中，绑定到 `HeroDetailComponent` 不会失败，这是因为这些要进行数据绑定的属性都带有 `@Input()` 和 `@Output()` 装饰器。

<code-example path="template-syntax/src/app/hero-detail.component.ts" region="input-output-1" title="src/app/hero-detail.component.ts" linenums="false">

</code-example>

<div class="l-sub-section">

Alternatively, you can identify members in the `inputs` and `outputs` arrays
of the directive metadata, as in this example:

另外，还可以在指令元数据的 `inputs` 或 `outputs` 数组中标记出这些成员。比如这个例子：

<code-example path="template-syntax/src/app/hero-detail.component.ts" region="input-output-2" title="src/app/hero-detail.component.ts" linenums="false">

</code-example>

</div>

### Input or output?

### 输入还是输出？

*Input* properties usually receive data values.
*Output* properties expose event producers, such as `EventEmitter` objects.

*输入*属性通常接收数据值。
*输出*属性暴露事件生产者，如 `EventEmitter` 对象。

The terms _input_ and _output_ reflect the perspective of the target directive.

_输入_和_输出_这两个词是从目标指令的角度来说的。

<figure>
  <img src="generated/images/guide/template-syntax/input-output.png" alt="Inputs and outputs">
</figure>

`HeroDetailComponent.hero` is an **input** property from the perspective of `HeroDetailComponent`
because data flows *into* that property from a template binding expression.

从 `HeroDetailComponent` 角度来看，`HeroDetailComponent.hero` 是个**输入**属性，
因为数据流从模板绑定表达式流*入*那个属性。

`HeroDetailComponent.deleteRequest` is an **output** property from the perspective of `HeroDetailComponent`
because events stream *out* of that property and toward the handler in a template binding statement.

从 `HeroDetailComponent` 角度来看，`HeroDetailComponent.deleteRequest` 是个**输出**属性，
因为事件从那个属性流*出*，流向模板绑定语句中的处理器。

<h3 id='aliasing-io'>Aliasing input/output properties</h3>

<h3 id='aliasing-io'>给输入/输出属性起别名</h3>

Sometimes the public name of an input/output property should be different from the internal name.

有时需要让输入/输出属性的公共名字不同于内部名字。

This is frequently the case with [attribute directives](guide/attribute-directives).
Directive consumers expect to bind to the name of the directive.
For example, when you apply a directive with a `myClick` selector to a `<div>` tag,
you expect to bind to an event property that is also called `myClick`.

这是使用 [attribute 指令](guide/attribute-directives)时的常见情况。
指令的使用者期望绑定到指令名。例如，在 `<div>` 上用 `myClick` 选择器应用指令时，
希望绑定的事件属性也叫 `myClick`。

<code-example path="template-syntax/src/app/app.component.html" region="myClick" title="src/app/app.component.html" linenums="false">

</code-example>

However, the directive name is often a poor choice for the name of a property within the directive class.
The directive name rarely describes what the property does.
The `myClick` directive name is not a good name for a property that emits click messages.

然而，在指令类中，直接用指令名作为自己的属性名通常都不是好的选择。
指令名很少能描述这个属性是干嘛的。
`myClick` 这个指令名对于用来发出 click 消息的属性就算不上一个好名字。

Fortunately, you can have a public name for the property that meets conventional expectations,
while using a different name internally.
In the example immediately above, you are actually binding *through the* `myClick` *alias* to
the directive's own `clicks` property.

幸运的是，可以使用约定俗成的公共名字，同时在内部使用不同的名字。
在上面例子中，实际上是把 `myClick` 这个别名指向了指令自己的 `clicks` 属性。

You can specify the alias for the property name by passing it into the input/output decorator like this:

把别名传进@Input/@Output 装饰器，就可以为属性指定别名，就像这样：

<code-example path="template-syntax/src/app/click.directive.ts" region="output-myClick" title="src/app/click.directive.ts" linenums="false">

</code-example>

<div class="l-sub-section">

You can also alias property names in the `inputs` and `outputs` arrays.
You write a colon-delimited (`:`) string with
the directive property name on the *left* and the public alias on the *right*:

也可在 `inputs` 和 `outputs` 数组中为属性指定别名。
可以写一个冒号 (`:`) 分隔的字符串，*左侧*是指令中的属性名，*右侧*则是公共别名。

<code-example path="template-syntax/src/app/click.directive.ts" region="output-myClick2" title="src/app/click.directive.ts" linenums="false">

</code-example>

</div>

<hr/>

{@a expression-operators}

## Template expression operators

## 模板表达式操作符

The template expression language employs a subset of JavaScript syntax supplemented with a few special operators
for specific scenarios. The next sections cover two of these operators: _pipe_ and _safe navigation operator_.

模板表达式语言使用了 JavaScript 语法的子集，并补充了几个用于特定场景的特殊操作符。
  下面介绍其中的两个：_管道_和_安全导航操作符_。

{@a pipe}

### The pipe operator ( <span class="syntax">|</span> )

### 管道操作符 ( | )

The result of an expression might require some transformation before you're ready to use it in a binding.
For example, you might display a number as a currency, force text to uppercase, or filter a list and sort it.

在绑定之前，表达式的结果可能需要一些转换。例如，可能希望把数字显示成金额、强制文本变成大写，或者过滤列表以及进行排序。

Angular [pipes](guide/pipes) are a good choice for small transformations such as these.
Pipes are simple functions that accept an input value and return a transformed value.
They're easy to apply within template expressions, using the **pipe operator (`|`)**:

Angular [管道](guide/pipes)对像这样的小型转换来说是个明智的选择。
管道是一个简单的函数，它接受一个输入值，并返回转换结果。
它们很容易用于模板表达式中，只要使用**管道操作符 (`|`) **就行了。

<code-example path="template-syntax/src/app/app.component.html" region="pipes-1" title="src/app/app.component.html" linenums="false">

</code-example>

The pipe operator passes the result of an expression on the left to a pipe function on the right.

管道操作符会把它左侧的表达式结果传给它右侧的管道函数。

You can chain expressions through multiple pipes:

还可以通过多个管道串联表达式：

<code-example path="template-syntax/src/app/app.component.html" region="pipes-2" title="src/app/app.component.html" linenums="false">

</code-example>

And you can also [apply parameters](guide/pipes#parameterizing-a-pipe) to a pipe:

还能对它们使用参数：

<code-example path="template-syntax/src/app/app.component.html" region="pipes-3" title="src/app/app.component.html" linenums="false">

</code-example>

The `json` pipe is particularly helpful for debugging bindings:

`json` 管道对调试绑定特别有用：

<code-example path="template-syntax/src/app/app.component.html" linenums="false" title="src/app/app.component.html (pipes-json)" region="pipes-json">

</code-example>

The generated output would look something like this

它生成的输出是这样的：

<code-example language="json">

  { "id": 0, "name": "Hercules", "emotion": "happy",
    "birthdate": "1970-02-25T08:00:00.000Z",
    "url": "http://www.imdb.com/title/tt0065832/",
    "rate": 325 }

</code-example>

<hr/>

{@a safe-navigation-operator}

### The safe navigation operator ( <span class="syntax">?.</span> ) and null property paths

### 安全导航操作符 ( ?. ) 和空属性路径

The Angular **safe navigation operator (`?.`)** is a fluent and convenient way to
guard against null and undefined values in property paths.
Here it is, protecting against a view render failure if the `currentHero` is null.

Angular 的**安全导航操作符 (`?.`) **是一种流畅而便利的方式，用来保护出现在属性路径中 null 和 undefined 值。
下例中，当 `currentHero` 为空时，保护视图渲染器，让它免于失败。

<code-example path="template-syntax/src/app/app.component.html" region="safe-2" title="src/app/app.component.html" linenums="false">

</code-example>

What happens when the following data bound `title` property is null?

如果下列数据绑定中 `title` 属性为空，会发生什么？

<code-example path="template-syntax/src/app/app.component.html" region="safe-1" title="src/app/app.component.html" linenums="false">

</code-example>

The view still renders but the displayed value is blank; you see only "The title is" with nothing after it.
That is reasonable behavior. At least the app doesn't crash.

这个视图仍然被渲染出来，但是显示的值是空；只能看到 “The title is”，它后面却没有任何东西。
这是合理的行为。至少应用没有崩溃。

Suppose the template expression involves a property path, as in this next example
that displays the `name` of a null hero.

假设模板表达式涉及属性路径，在下例中，显示一个空 (null) 英雄的 `firstName`。

<code-example language="html">

  The null hero's name is {{nullHero.name}}

</code-example>

JavaScript throws a null reference error, and so does Angular:

JavaScript 抛出了空引用错误，Angular 也是如此：

<code-example format="nocode">

  TypeError: Cannot read property 'name' of null in [null].

</code-example>

Worse, the *entire view disappears*.

晕，*整个视图都不见了*。

This would be reasonable behavior if the `hero` property could never be null.
If it must never be null and yet it is null,
that's a programming error that should be caught and fixed.
Throwing an exception is the right thing to do.

如果确信 `hero` 属性永远不可能为空，可以声称这是合理的行为。
如果它必须不能为空，但它仍然是空值，实际上是制造了一个编程错误，它应该被捕获和修复。
这种情况应该抛出异常。

On the other hand, null values in the property path may be OK from time to time,
especially when the data are null now and will arrive eventually.

另一方面，属性路径中的空值可能会时常发生，特别是当我们知道数据最终会出现。

While waiting for data, the view should render without complaint, and
the null property path should display as blank just as the `title` property does.

当等待数据的时候，视图渲染器不应该抱怨，而应该把这个空属性路径显示为空白，就像上面 `title` 属性那样。

Unfortunately, the app crashes when the `currentHero` is null.

不幸的是，当 `currentHero` 为空的时候，应用崩溃了。

You could code around that problem with [*ngIf](guide/template-syntax#ngIf).

可以通过用[NgIf](guide/template-syntax#ngIf)代码环绕它来解决这个问题。

<code-example path="template-syntax/src/app/app.component.html" region="safe-4" title="src/app/app.component.html" linenums="false">

</code-example>

You could try to chain parts of the property path with `&&`, knowing that the expression bails out
when it encounters the first null.

或者可以尝试通过 `&&` 来把属性路径的各部分串起来，让它在遇到第一个空值的时候，就返回空。

<code-example path="template-syntax/src/app/app.component.html" region="safe-5" title="src/app/app.component.html" linenums="false">

</code-example>

These approaches have merit but can be cumbersome, especially if the property path is long.
Imagine guarding against a null somewhere in a long property path such as `a.b.c.d`.

这些方法都有价值，但是会显得笨重，特别是当这个属性路径非常长的时候。
想象一下在一个很长的属性路径（如 `a.b.c.d`）中对空值提供保护。

The Angular safe navigation operator (`?.`) is a more fluent and convenient way to guard against nulls in property paths.
The expression bails out when it hits the first null value.
The display is blank, but the app keeps rolling without errors.

Angular 安全导航操作符 (`?.`) 是在属性路径中保护空值的更加流畅、便利的方式。
表达式会在它遇到第一个空值的时候跳出。
显示是空的，但应用正常工作，而没有发生错误。

<code-example path="template-syntax/src/app/app.component.html" region="safe-6" title="src/app/app.component.html" linenums="false">

</code-example>

It works perfectly with long property paths such as `a?.b?.c?.d`.

在像 `a?.b?.c?.d` 这样的长属性路径中，它工作得很完美。<a href="#top-of-page">back to top</a>

<hr/>

{@a non-null-assertion-operator}

### The non-null assertion operator ( <span class="syntax">!</span> )

### 非空断言操作符（<span class="syntax">!</span>）

As of Typescript 2.0, you can enforce [strict null checking](http://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-0.html "Strict null checking in TypeScript") with the `--strictNullChecks` flag. TypeScript then ensures that no variable is _unintentionally_ null or undefined.

在 TypeScript 2.0 中，我们可以使用 `--strictNullChecks` 标志强制开启[严格空值检查](http://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-0.html "Strict null checking in TypeScript")。TypeScript 就会确保不存在意料之外的 null 或 undefined。

In this mode, typed variables disallow null and undefined by default. The type checker throws an error if you leave a variable unassigned or try to assign null or undefined to a variable whose type disallows null and undefined.

在这种模式下，有类型的变量默认是不允许 null 或 undefined 值的，如果有未赋值的变量，或者试图把 null 或 undefined 赋值给不允许为空的变量，类型检查器就会抛出一个错误。

The type checker also throws an error if it can't determine whether a variable will be null or undefined at runtime.
You may know that can't happen but the type checker doesn't know.
You tell the type checker that it can't happen by applying the post-fix
[_non-null assertion operator (!)_](http://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-0.html#non-null-assertion-operator "Non-null assertion operator").

如果类型检查器在运行期间无法确定一个变量是 null 或 undefined，那么它也会抛出一个错误。
我们自己可能知道它不会为空，但类型检查器不知道。
所以我们要告诉类型检查器，它不会为空，这时就要用到[*非空断言操作符*](http://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-0.html#non-null-assertion-operator "Non-null assertion operator")。

The _Angular_ **non-null assertion operator (`!`)** serves the same purpose in an Angular template.

*Angular* 模板中的**非空断言操作符（`!`）也是同样的用途。

For example, after you use [*ngIf](guide/template-syntax#ngIf) to check that `hero` is defined, you can assert that
`hero` properties are also defined.

例如，在用[*ngIf](guide/template-syntax#ngIf)来检查过 `hero` 是已定义的之后，就可以断言 `hero` 属性一定是已定义的。

<code-example path="template-syntax/src/app/app.component.html" region="non-null-assertion-1" title="src/app/app.component.html" linenums="false">

</code-example>

When the Angular compiler turns your template into TypeScript code,
it prevents TypeScript from reporting that `hero.name` might be null or undefined.

在 Angular 编译器把你的模板转换成 TypeScript 代码时，这个操作符会防止 TypeScript 报告 "`hero.name` 可能为 null 或 undefined"的错误。

Unlike the [_safe navigation operator_](guide/template-syntax#safe-navigation-operator "Safe navigation operator (?.)"),
the **non-null assertion operator** does not guard against null or undefined.
Rather it tells the TypeScript type checker to suspend strict null checks for a specific property expression.

与[_安全导航操作符_](guide/template-syntax#safe-navigation-operator "Safe naviation operator (?.)")不同的是，**非空断言操作符**不会防止出现 null 或 undefined。
它只是告诉 TypeScript 的类型检查器对特定的属性表达式，不做 "严格空值检测"。

You'll need this template operator when you turn on strict null checks. It's optional otherwise.

如果我们打开了严格控制检测，那就要用到这个模板操作符，而其它情况下则是可选的。

<a href="#top-of-page">back to top</a>

<a href="#top-of-page">回到顶部</a>

<hr/>

{@a any-type-cast-function}

## The `$any` type cast function (`$any( <expression> )`) 

## 类型转换函数 `$any` （$any( <表达式> )）

Sometimes a binding expression will be reported as a type error and it is not possible or difficult
to fully specify the type. To silence the error, you can use the `$any` cast function to cast
the expression to [the `any` type](http://www.typescriptlang.org/docs/handbook/basic-types.html#any).

有时候，绑定表达式可能会报类型错误，并且它不能或很难指定类型。要消除这种报错，你可以使用 `$any` 转换函数来把表达式转换成 [`any` 类型](http://www.typescriptlang.org/docs/handbook/basic-types.html#any)。

<code-example path="template-syntax/src/app/app.component.html" region="any-type-cast-function-1" title="src/app/app.component.html" linenums="false">

</code-example>

In this example, when the Angular compiler turns your template into TypeScript code, 
it prevents TypeScript from reporting that `marker` is not a member of the `Hero`
interface.

在这个例子中，当 Angular 编译器把模板转换成 TypeScript 代码时，`$any` 表达式可以防止 TypeScript 编译器报错说 `marker` 不是 `Hero` 接口的成员。

The `$any` cast function can be used in conjunction with `this` to allow access to undeclared members of
the component.

`$any` 转换函数可以和 `this` 联合使用，以便访问组件中未声明过的成员。

<code-example path="template-syntax/src/app/app.component.html" region="any-type-cast-function-2" title="src/app/app.component.html" linenums="false">

</code-example>

The `$any` cast function can be used anywhere in a binding expression where a method call is valid.

`$any` 转换函数可以在绑定表达式中任何可以进行方法调用的地方使用。

## Summary

## 小结

You've completed this survey of template syntax.
Now it's time to put that knowledge to work on your own components and directives.


我们完成了模板语法的概述。现在，该把如何写组件和指令的知识投入到实际工作当中了。
-												docs(aio): doc guide tweaks (GS thru Components)

Working through obvious non-image content defects, from top of menu (Getting Started) through Fundamentals/Components.

											
										
										
											2017-05-08 23:47:34 -04:00
+								# Template Syntax
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												Merge remote-tracking branch 'en/master' into aio

# Conflicts:
#	aio/content/guide/ajs-quick-reference.md
#	aio/content/guide/animations.md
#	aio/content/guide/aot-compiler.md
#	aio/content/guide/architecture.md
#	aio/content/guide/attribute-directives.md
#	aio/content/guide/bootstrapping.md
#	aio/content/guide/browser-support.md
#	aio/content/guide/cb-index.md
#	aio/content/guide/change-log.md
#	aio/content/guide/cheatsheet.md
#	aio/content/guide/cli-quickstart.md
#	aio/content/guide/component-interaction.md
#	aio/content/guide/component-styles.md
#	aio/content/guide/dependency-injection-in-action.md
#	aio/content/guide/dependency-injection.md
#	aio/content/guide/deployment.md
#	aio/content/guide/displaying-data.md
#	aio/content/guide/dynamic-component-loader.md
#	aio/content/guide/dynamic-form.md
#	aio/content/guide/form-validation.md
#	aio/content/guide/forms.md
#	aio/content/guide/glossary.md
#	aio/content/guide/hierarchical-dependency-injection.md
#	aio/content/guide/i18n.md
#	aio/content/guide/index.md
#	aio/content/guide/learning-angular.md
#	aio/content/guide/lifecycle-hooks.md
#	aio/content/guide/ngmodule-faq.md
#	aio/content/guide/ngmodule.md
#	aio/content/guide/npm-packages.md
#	aio/content/guide/pipes.md
#	aio/content/guide/quickstart.md
#	aio/content/guide/reactive-forms.md
#	aio/content/guide/router.md
#	aio/content/guide/security.md
#	aio/content/guide/server-communication.md
#	aio/content/guide/set-document-title.md
#	aio/content/guide/setup-systemjs-anatomy.md
#	aio/content/guide/setup.md
#	aio/content/guide/structural-directives.md
#	aio/content/guide/styleguide.md
#	aio/content/guide/template-syntax.md
#	aio/content/guide/testing.md
#	aio/content/guide/ts-to-js.md
#	aio/content/guide/typescript-configuration.md
#	aio/content/guide/upgrade.md
#	aio/content/guide/user-input.md
#	aio/content/guide/visual-studio-2015.md
#	aio/content/guide/webpack.md
#	aio/content/navigation.json
#	aio/content/tutorial/index.md
#	aio/content/tutorial/toh-pt1.md
#	aio/content/tutorial/toh-pt2.md
#	aio/content/tutorial/toh-pt3.md
#	aio/content/tutorial/toh-pt4.md
#	aio/content/tutorial/toh-pt5.md
#	aio/content/tutorial/toh-pt6.md
#	aio/package.json
#	aio/src/styles/main.scss
#	aio/transforms/angular.io-package/index.js

											
										
										
											2017-07-29 12:03:22 -04:00
+								# 模板语法
-												docs(aio): ensure blank lines before HTML blocks in markdown

											
										
										
											2017-03-30 15:04:18 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
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+								<style>
-												build(aio): new migration

											
										
										
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+								  h4 {font-size: 17px !important; text-transform: none !important;}
 								  .syntax { font-family: Consolas, 'Lucida Sans', Courier, sans-serif; color: black; font-size: 85%; }
 								  h4 .syntax { font-size: 100%; }
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
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+								</style>
-												refactor(aio): move content-related images to `content/images/`

											
										
										
											2017-04-26 08:11:02 -04:00
+								The Angular application manages what the user sees and can do, achieving this through the interaction of a
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								component class instance (the *component*) and its user-facing template.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								Angular 应用管理着用户之所见和所为，并通过 Component 类的实例（*组件*）和面向用户的模板来与用户交互。
-												refactor(aio): move content-related images to `content/images/`

											
										
										
											2017-04-26 08:11:02 -04:00
+								You may be familiar with the component/template duality from your experience with model-view-controller (MVC) or model-view-viewmodel (MVVM).
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								In Angular, the component plays the part of the controller/viewmodel, and the template represents the view.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								从使用模型-视图-控制器 (MVC) 或模型-视图-视图模型 (MVVM) 的经验中，很多开发人员都熟悉了组件和模板这两个概念。
 								  在 Angular 中，组件扮演着控制器或视图模型的角色，模板则扮演视图的角色。
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): fix dangling links

											
										
										
											2017-07-10 05:01:54 -04:00
+								This page is a comprehensive technical reference to the Angular template language.
 								It explains basic principles of the template language and describes most of the syntax that you'll encounter elsewhere in the documentation.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
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-												fix: translate more

											
										
										
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+								这是一篇关于 Angular 模板语言的技术大全。
 								它解释了模板语言的基本原理，并描述了我们将在文档中其它地方遇到的大部分语法。
-												fix(aio): fix trackBy demo in template-syntax article

											
										
										
											2017-06-09 04:05:16 -04:00
+								Many code snippets illustrate the points and concepts, all of them available
 								in the <live-example title="Template Syntax Live Code"></live-example>.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
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-												fix: translate more

											
										
										
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+								这里还有很多代码片段用来解释技术点和概念，它们全都在<live-example title="模板语法的在线例子"></live-example>中。
-												docs(aio): migrate content docs from angular.io

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 								{@a html}
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## HTML in templates
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								## 模板中的 HTML
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								HTML is the language of the Angular template.
-												refactor(aio): move content-related images to `content/images/`

											
										
										
											2017-04-26 08:11:02 -04:00
+								Almost all HTML syntax is valid template syntax.
 								The `<script>` element is a notable exception;
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
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+								it is forbidden, eliminating the risk of script injection attacks.
 								In practice, `<script>` is ignored and a warning appears in the browser console.
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								See the [Security](guide/security) page for details.
-												docs(aio): migrate content docs from angular.io

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-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								HTML 是 Angular 模板的语言。几乎所有的 HTML 语法都是有效的模板语法。
 								但值得注意的例外是 `<script>` 元素，它被禁用了，以阻止脚本注入攻击的风险。（实际上，`<script>` 只是被忽略了。）
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								参见[安全](guide/security)页了解详情。
-												refactor(aio): move content-related images to `content/images/`

											
										
										
											2017-04-26 08:11:02 -04:00
+								Some legal HTML doesn't make much sense in a template.
 								The `<html>`, `<body>`, and `<base>` elements have no useful role.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Pretty much everything else is fair game.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								有些合法的 HTML 被用在模板中是没有意义的。`<html>`、`<body>` 和 `<base>` 元素这个舞台上中并没有扮演有用的角色。剩下的所有元素基本上就都一样用了。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												refactor(aio): move content-related images to `content/images/`

											
										
										
											2017-04-26 08:11:02 -04:00
+								You can extend the HTML vocabulary of your templates with components and directives that appear as new elements and attributes.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								In the following sections, you'll learn how to get and set DOM (Document Object Model) values dynamically through data binding.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								可以通过组件和指令来扩展模板中的 HTML 词汇。它们看上去就是新元素和属性。接下来将学习如何通过数据绑定来动态获取/设置 DOM（文档对象模型）的值。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								Begin with the first form of data binding&mdash;interpolation&mdash;to see how much richer template HTML can be.
-												fix: many of broken links

											
										
										
											2017-07-30 00:32:56 -04:00
 								我们首先看看数据绑定的第一种形式 —— 插值表达式，它展示了模板的 HTML 可以有多丰富。
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a interpolation}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## Interpolation ( <span class="syntax">{&#xfeff;{...}}</span> )
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 插值表达式 ( <span class="syntax">{&#xfeff;{...}}</span> )
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								You met the double-curly braces of interpolation, `{{` and `}}`, early in your Angular education.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								在以前的 Angular 教程中，我们遇到过由双花括号括起来的插值表达式，`{{` 和 `}}`。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="first-interpolation" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								You use interpolation to weave calculated strings into the text between HTML element tags and within attribute assignments.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								插值表达式可以把计算后的字符串插入到 HTML 元素标签内的文本或对标签的属性进行赋值。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="title+image" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The text between the braces is often the name of a component property. Angular replaces that name with the
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								string value of the corresponding component property. In the example above, Angular evaluates the `title` and `heroImageUrl` properties
 								and "fills in the blanks", first displaying a bold application title and then a heroic image.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								在括号之间的“素材”，通常是组件属性的名字。Angular 会用组件中相应属性的字符串值，替换这个名字。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								  上例中，Angular 计算 `title` 和 `heroImageUrl` 属性的值，并把它们填在空白处。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								  首先显示粗体的应用标题，然后显示英雄的图片。
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								More generally, the text between the braces is a **template expression** that Angular first **evaluates**
 								and then **converts to a string**. The following interpolation illustrates the point by adding the two numbers:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								一般来说，括号间的素材是一个**模板表达式**，Angular 先**对它求值**，再把它**转换成字符串**。
 								  下列插值表达式通过把括号中的两个数字相加说明了这一点：
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="sum-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The expression can invoke methods of the host component such as `getVal()`, seen here:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								这个表达式可以调用宿主组件的方法，就像下面用的 `getVal()`：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="sum-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Angular evaluates all expressions in double curly braces,
 								converts the expression results to strings, and links them with neighboring literal strings. Finally,
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								it assigns this composite interpolated result to an **element or directive property**.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								Angular 对所有双花括号中的表达式求值，把求值的结果转换成字符串，并把它们跟相邻的字符串字面量连接起来。最后，把这个组合出来的插值结果赋给**元素或指令的属性**。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								You appear to be inserting the result between element tags and assigning it to attributes.
 								It's convenient to think so, and you rarely suffer for this mistake.
 								Though this is not exactly true. Interpolation is a special syntax that Angular converts into a
-												docs(aio): fix lots of broken links

Closes #16317

											
										
										
											2017-04-30 16:10:32 -04:00
+								[property binding](guide/template-syntax#property-binding), as is explained [below](guide/template-syntax#property-binding-or-interpolation).
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								表面上看，我们在元素标签之间插入了结果和对标签的属性进行了赋值。
 								这样思考起来很方便，并且这个误解很少给我们带来麻烦。
-												fix: many of broken links

											
										
										
											2017-07-30 00:32:56 -04:00
+								但严格来讲，这是不对的。插值表达式是一个特殊的语法，Angular 把它转换成了[属性绑定](guide/template-syntax#property-binding)，[后面](guide/template-syntax#property-binding-or-interpolation)将会解释这一点。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								But first, let's take a closer look at template expressions and statements.
-												fix: minor improvements

											
										
										
											2017-07-30 05:40:53 -04:00
 								讲解属性绑定之前，先深入了解一下模板表达式和模板语句。
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								{@a template-expressions}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## Template expressions
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 模板表达式
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								A template **expression** produces a value.
 								Angular executes the expression and assigns it to a property of a binding target;
 								the target might be an HTML element, a component, or a directive.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								模板**表达式**产生一个值。
 								  Angular 执行这个表达式，并把它赋值给绑定目标的属性，这个绑定目标可能是 HTML 元素、组件或指令。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The interpolation braces in `{{1 + 1}}` surround the template expression `1 + 1`.
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								In the [property binding](guide/template-syntax#property-binding) section below,
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								a template expression appears in quotes to the right of the&nbsp;`=` symbol as in `[property]="expression"`.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`{{1 + 1}}` 中所包含的模板表达式是 `1 + 1`。
 								  在[属性绑定](guide/template-syntax#property-binding)中会再次看到模板表达式，它出现在 `=` 右侧的引号中，就像这样：`[property]="expression"`。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								You write these template expressions in a language that looks like JavaScript.
 								Many JavaScript expressions are legal template expressions, but not all.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								编写模板表达式所用的语言看起来很像 JavaScript。
 								  很多 JavaScript 表达式也是合法的模板表达式，但不是全部。
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								JavaScript expressions that have or promote side effects are prohibited,
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								including:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								JavaScript 中那些具有或可能引发副作用的表达式是被禁止的，包括：
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								* assignments (`=`, `+=`, `-=`, ...)
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   赋值 (`=`, `+=`, `-=`, ...)
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								* <code>new</code>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   `new` 运算符
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								* chaining expressions with <code>;</code> or <code>,</code>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   使用 `;` 或 `,` 的链式表达式
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								* increment and decrement operators (`++` and `--`)
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   自增或自减操作符 (`++` 和 `--`)
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								Other notable differences from JavaScript syntax include:
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								和 JavaScript 语 法的其它显著不同包括：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								* no support for the bitwise operators `|` and `&`
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   不支持位运算 `|` 和 `&`
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								* new [template expression operators](guide/template-syntax#expression-operators), such as `|`, `?.` and `!`.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   具有新的[模板表达式运算符](guide/template-syntax#expression-operators)，比如 `|`、`?.` 和 `!`。
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
 								{@a expression-context}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								### Expression context
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 表达式上下文
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The *expression context* is typically the _component_ instance.
 								In the following snippets, the `title`  within double-curly braces and the
 								`isUnchanged` in quotes refer to properties of the `AppComponent`.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								典型的*表达式上下文*就是这个**组件实例**，它是各种绑定值的来源。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								在下面的代码片段中，双花括号中的 `title` 和引号中的 `isUnchanged` 所引用的都是 `AppComponent` 中的属性。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="context-component-expression" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								An expression may also refer to properties of the _template's_ context
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								such as a [template input variable](guide/template-syntax#template-input-variable) (`let hero`)
 								or a [template reference variable](guide/template-syntax#ref-vars) (`#heroInput`).
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								表达式的上下文可以包括组件之外的对象。
 								  比如[模板输入变量](guide/template-syntax#template-input-variable) (`let hero`)和[模板引用变量](guide/template-syntax#ref-vars)(`#heroInput`)就是备选的上下文对象之一。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="context-var" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The context for terms in an expression is a blend of the _template variables_,
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								the directive's _context_ object (if it has one), and the component's _members_.
 								If you reference a name that belongs to more than one of these namespaces,
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								the template variable name takes precedence, followed by a name in the directive's _context_,
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								and, lastly, the component's member names.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								表达式中的上下文变量是由*模板变量*、指令的*上下文变量*（如果有）和组件的*成员*叠加而成的。
 								如果我们要引用的变量名存在于一个以上的命名空间中，那么，模板变量是最优先的，其次是指令的上下文变量，最后是组件的成员。
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The previous example presents such a name collision. The component has a `hero`
 								property and the `*ngFor` defines a `hero` template variable.
 								The `hero` in `{{hero.name}}`
 								refers to the template input variable, not the component's property.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								上一个例子中就体现了这种命名冲突。组件具有一个名叫 `hero` 的属性，而 `*ngFor` 声明了一个也叫 `hero` 的模板变量。
 								在 `{{hero.name}}` 表达式中的 `hero` 实际引用的是模板变量，而不是组件的属性。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Template expressions cannot refer to anything in
-												docs(aio): document the special treatment of undefined
											
										
										
											2017-09-23 22:15:46 -04:00
+								the global namespace (except `undefined`). They can't refer to `window` or `document`. They
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								can't call `console.log` or `Math.max`. They are restricted to referencing
 								members of the expression context.
-												fix: minor improvements

											
										
										
											2017-07-30 05:40:53 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								模板表达式不能引用全局命名空间中的任何东西，比如 `window` 或 `document`。它们也不能调用 `console.log` 或 `Math.max`。
-												fix: minor improvements

											
										
										
											2017-07-30 05:40:53 -04:00
+								它们只能引用表达式上下文中的成员。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								{@a no-side-effects}
 								{@a expression-guidelines}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								### Expression guidelines
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 表达式指南
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Template expressions can make or break an application.
 								Please follow these guidelines:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								模板表达式能成就或毁掉一个应用。请遵循下列指南：
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								* [No visible side effects](guide/template-syntax#no-visible-side-effects)
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   [没有可见的副作用](guide/template-syntax#no-visible-side-effects)
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								* [Quick execution](guide/template-syntax#quick-execution)
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   [执行迅速](guide/template-syntax#quick-execution)
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								* [Simplicity](guide/template-syntax#simplicity)
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   [非常简单](guide/template-syntax#simplicity)
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								* [Idempotence](guide/template-syntax#idempotence)
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   [幂等性](guide/template-syntax#idempotence)
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The only exceptions to these guidelines should be in specific circumstances that you thoroughly understand.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								超出上面指南外的情况应该只出现在那些你确信自己已经彻底理解的特定场景中。
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+								#### No visible side effects
-												docs(aio): merge latest chinese translations

											
										
										
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+								#### 没有可见的副作用
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								A template expression should not change any application state other than the value of the
 								target property.
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											2017-07-22 23:51:25 -04:00
+								模板表达式除了目标属性的值以外，不应该改变应用的任何状态。
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											2017-02-22 13:09:39 -05:00
+								This rule is essential to Angular's "unidirectional data flow" policy.
 								You should never worry that reading a component value might change some other displayed value.
 								The view should be stable throughout a single rendering pass.
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											2017-07-22 23:51:25 -04:00
+								这条规则是 Angular “单向数据流”策略的基础。
 								永远不用担心读取组件值可能改变另外的显示值。
 								在一次单独的渲染过程中，视图应该总是稳定的。
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											2017-02-22 13:09:39 -05:00
+								#### Quick execution
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								#### 执行迅速
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								Angular executes template expressions after every change detection cycle.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Change detection cycles are triggered by many asynchronous activities such as
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								promise resolutions, http results, timer events, keypresses and mouse moves.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								Angular 执行模板表达式比我们想象的频繁。
 								它们可能在每一次按键或鼠标移动后被调用。
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
 								Expressions should finish quickly or the user experience may drag, especially on slower devices.
 								Consider caching values when their computation is expensive.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								表达式应该快速结束，否则用户就会感到拖沓，特别是在较慢的设备上。
 								当计算代价较高时，应该考虑缓存那些从其它值计算得出的值。
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											2017-02-22 13:09:39 -05:00
+								#### Simplicity
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								#### 非常简单
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

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+								Although it's possible to write quite complex template expressions, you should avoid them.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								虽然也可以写出相当复杂的模板表达式，但不要那么写。
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											2017-02-22 13:09:39 -05:00
+								A property name or method call should be the norm.
 								An occasional Boolean negation (`!`) is OK.
 								Otherwise, confine application and business logic to the component itself,
 								where it will be easier to develop and test.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								常规是属性名或方法调用。偶尔的逻辑取反 (`!`) 也还凑合。
 								其它情况下，应在组件中实现应用和业务逻辑，使开发和测试变得更容易。
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											2017-02-22 13:09:39 -05:00
+								#### Idempotence
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								#### 幂等性
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											2017-02-22 13:09:39 -05:00
+								An [idempotent](https://en.wikipedia.org/wiki/Idempotence) expression is ideal because
 								it is free of side effects and improves Angular's change detection performance.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								最好使用[幂等的](https://en.wikipedia.org/wiki/Idempotence)表达式，因为它没有副作用，并且能提升 Angular 变更检测的性能。
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											2017-02-22 13:09:39 -05:00
+								In Angular terms, an idempotent expression always returns *exactly the same thing* until
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								one of its dependent values changes.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								在 Angular 的术语中，幂等的表达式应该总是返回*完全相同的东西*，直到某个依赖值发生改变。
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Dependent values should not change during a single turn of the event loop.
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								If an idempotent expression returns a string or a number, it returns the same string or number
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								when called twice in a row. If the expression returns an object (including an `array`),
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								it returns the same object *reference* when called twice in a row.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
 								在单独的一次事件循环中，被依赖的值不应该改变。
 								  如果幂等的表达式返回一个字符串或数字，连续调用它两次，也应该返回相同的字符串或数字。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								  如果幂等的表达式返回一个对象（包括 `Date` 或 `Array`），连续调用它两次，也应该返回同一个对象的*引用*。
-												fix: all "back to top" links

											
										
										
											2017-07-30 10:11:36 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
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 								{@a template-statements}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								## Template statements
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 模板语句
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											2017-02-22 13:09:39 -05:00
+								A template **statement** responds to an **event** raised by a binding target
 								such as an element, component, or directive.
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								You'll see template statements in the [event binding](guide/template-syntax#event-binding) section,
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											2017-02-22 13:09:39 -05:00
+								appearing in quotes to the right of the `=`&nbsp;symbol as in `(event)="statement"`.
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											2017-07-22 23:51:25 -04:00
+								模板**语句**用来响应由绑定目标（如 HTML 元素、组件或指令）触发的**事件**。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								模板语句将在[事件绑定](guide/template-syntax#event-binding)一节看到，它出现在 `=` 号右侧的引号中，就像这样：`(event)="statement"`。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="context-component-statement" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								A template statement *has a side effect*.
 								That's the whole point of an event.
 								It's how you update application state from user action.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								模板语句*有副作用*。
 								这是事件处理的关键。因为我们要根据用户的输入更新应用状态。
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											2017-02-22 13:09:39 -05:00
+								Responding to events is the other side of Angular's "unidirectional data flow".
 								You're free to change anything, anywhere, during this turn of the event loop.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								响应事件是 Angular 中“单向数据流”的另一面。
 								    在一次事件循环中，可以随意改变任何地方的任何东西。
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								Like template expressions, template *statements* use a language that looks like JavaScript.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The template statement parser differs from the template expression parser and
 								specifically supports both basic assignment (`=`) and chaining expressions
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								(with <code>;</code> or <code>,</code>).
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								和模板表达式一样，模板*语句*使用的语言也像 JavaScript。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								  模板语句解析器和模板表达式解析器有所不同，特别之处在于它支持基本赋值 (`=`) 和表达式链 (`;` 和 `,`)。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								However, certain JavaScript syntax is not allowed:
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								然而，某些 JavaScript 语法仍然是不允许的：
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								* <code>new</code>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   `new` 运算符
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								* increment and decrement operators, `++` and `--`
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   自增和自减运算符：`++` 和 `--`
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								* operator assignment, such as `+=` and `-=`
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   操作并赋值，例如 `+=` 和 `-=`
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								* the bitwise operators `|` and `&`
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   位操作符 `|` 和 `&`
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								* the [template expression operators](guide/template-syntax#expression-operators)
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   [模板表达式运算符](guide/template-syntax#expression-operators)
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								### Statement context
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 语句上下文
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											2017-02-22 13:09:39 -05:00
+								As with expressions, statements can refer only to what's in the statement context
 								such as an event handling method of the component instance.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								和表达式中一样，语句只能引用语句上下文中 —— 通常是正在绑定事件的那个**组件实例**。
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The *statement context* is typically the component instance.
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											2017-02-22 13:09:39 -05:00
+								The *deleteHero* in `(click)="deleteHero()"` is a method of the data-bound component.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								典型的*语句上下文*就是当前组件的实例。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`(click)="deleteHero()"` 中的*deleteHero*就是这个数据绑定组件上的一个方法。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="context-component-statement" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								The statement context may also refer to properties of the template's own context.
 								In the following examples, the template `$event` object,
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								a [template input variable](guide/template-syntax#template-input-variable) (`let hero`),
 								and a [template reference variable](guide/template-syntax#ref-vars) (`#heroForm`)
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								are passed to an event handling method of the component.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								语句上下文可以引用模板自身上下文中的属性。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								在下面的例子中，就把模板的 `$event` 对象、[模板输入变量](guide/template-syntax#template-input-variable) (`let hero`)和[模板引用变量](guide/template-syntax#ref-vars) (`#heroForm`)传给了组件中的一个事件处理器方法。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="context-var-statement" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Template context names take precedence over component context names.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								In `deleteHero(hero)` above, the `hero` is the template input variable,
 								not the component's `hero` property.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								模板上下文中的变量名的优先级高于组件上下文中的变量名。在上面的 `deleteHero(hero)` 中，`hero` 是一个模板输入变量，而不是组件中的 `hero` 属性。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Template statements cannot refer to anything in the global namespace. They
 								can't refer to `window` or `document`.
 								They can't call `console.log` or `Math.max`.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								模板语句不能引用全局命名空间的任何东西。比如不能引用 `window` 或 `document`，也不能调用 `console.log` 或 `Math.max`。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
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+								### Statement guidelines
-												docs(aio): merge latest chinese translations

											
										
										
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+								### 语句指南
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								As with expressions, avoid writing complex template statements.
 								A method call or simple property assignment should be the norm.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								和表达式一样，避免写复杂的模板语句。
 								常规是函数调用或者属性赋值。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
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+								Now that you have a feel for template expressions and statements,
 								you're ready to learn about the varieties of data binding syntax beyond interpolation.
-												fix: minor improvements

											
										
										
											2017-07-30 05:40:53 -04:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								现在，对模板表达式和语句有了一点感觉了吧。
-												fix: minor improvements

											
										
										
											2017-07-30 05:40:53 -04:00
+								  除插值表达式外，还有各种各样的数据绑定语法，是学习它们是时候了。
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update to remark syntax

											
										
										
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+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
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 								{@a binding-syntax}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								## Binding syntax: An overview
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 绑定语法：概览
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Data binding is a mechanism for coordinating what users see, with application data values.
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								While you could push values to and pull values from HTML,
 								the application is easier to write, read, and maintain if you turn these chores over to a binding framework.
 								You simply declare bindings between binding sources and target HTML elements and let the framework do the work.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
 								数据绑定是一种机制，用来协调用户所见和应用数据。
 								  虽然我们能往 HTML 推送值或者从 HTML 拉取值，
 								  但如果把这些琐事交给数据绑定框架处理，
 								  应用会更容易编写、阅读和维护。
 								  只要简单地在绑定源和目标 HTML 元素之间声明绑定，框架就会完成这项工作。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Angular provides many kinds of data binding.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								This guide covers most of them, after a high-level view of Angular data binding and its syntax.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								Angular 提供了各种各样的数据绑定，本章将逐一讨论。
 								不过我们要先从高层视角来看看 Angular 数据绑定及其语法。
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Binding types can be grouped into three categories distinguished by the direction of data flow:
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								from the _source-to-view_, from _view-to-source_, and in the two-way sequence: _view-to-source-to-view_:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								绑定的类型可以根据数据流的方向分成三类：
 								*从数据源到视图*、*从视图到数据源*以及双向的*从视图到数据源再到视图*。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								<style>
 								  td, th {vertical-align: top}
 								</style>
 								<table width="100%">
 								  <col width="30%">
 								  </col>
 								  <col width="50%">
 								  </col>
 								  <col width="20%">
 								  </col>
-												fix: 人工修订自动翻译

											
										
										
											2018-03-06 23:26:05 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								  <tr>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								    <th>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Data direction
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      数据方向
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								    </th>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								    <th>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Syntax
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      语法
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								    </th>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <th>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Type
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      绑定类型
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </th>
 								  </tr>
-												fix: 人工修订自动翻译

											
										
										
											2018-03-06 23:26:05 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								  <tr>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								    <td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      One-way<br>from data source<br>to view target
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
 								      <code-example>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								        {{expression}}
 								        [target]="expression"
 								        bind-target="expression"
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								      </code-example>
 								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正自动翻译结果

											
										
										
											2018-03-06 22:25:56 -05:00
+								      Interpolation<br>
 								      Property<br>
 								      Attribute<br>
 								      Class<br>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Style
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正自动翻译结果

											
										
										
											2018-03-06 22:25:56 -05:00
+								      插值表达式<br>
 								      属性<br>
 								      Attribute<br>
 								      CSS 类<br>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      样式
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								    </td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
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+								    <tr>
-												docs(aio): merge latest chinese translations

											
										
										
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-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      <td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								        One-way<br>from view target<br>to data source
 								        从视图到数据源的单向绑定
 								      </td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								      <td>
-												docs(aio): merge latest chinese translations

											
										
										
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-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								        <code-example>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
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+								          (target)="statement"
 								          on-target="statement"
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								        </code-example>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

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+								      </td>
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+								      <td>
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+								        Event
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 								        事件
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+								      </td>
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+								    </tr>
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+								    <tr>
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+								      <td>
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+								        Two-way
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 								        双向
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+								      </td>
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 								      <td>
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+								        <code-example>
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+								          [(target)]="expression"
 								          bindon-target="expression"
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+								        </code-example>
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+								      </td>
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+								      <td>
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+								        Two-way
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+								        双向
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+								      </td>
 								    </tr>
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+								  </tr>
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+								</table>
-												build(aio): new migration

											
										
										
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+								<div class="alert is-important">
 								译注：由于 HTML attribute 和 DOM property 在中文中都被翻译成了“属性”，无法区分，
 								而接下来的部分重点是对它们进行比较。
 								我们无法改变历史，因此，在本章的翻译中，保留了它们的英文形式，不加翻译，以免混淆。
 								本章中，如果提到“属性”的地方，一定是指 property，因为在 Angular 中，实际上很少涉及 attribute。
 								但在其它章节中，为简单起见，凡是能通过上下文明显区分开的，就仍统一译为“属性”，
 								区分不明显的，会加注英文。
 								</div>
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+								Binding types other than interpolation have a **target name** to the left of the equal sign,
 								either surrounded by punctuation (`[]`, `()`) or preceded by a prefix (`bind-`, `on-`, `bindon-`).
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+								除了插值表达式之外的绑定类型，在等号左边是**目标名**，
 								  无论是包在括号中 (`[]`、`()`) 还是用前缀形式 (`bind-`、`on-`、`bindon-`) 。
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+								The target name is the name of a _property_. It may look like the name of an _attribute_ but it never is.
 								To appreciate the difference, you must develop a new way to think about template HTML.
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+								这个目标名就是*属性（Property）*的名字。它可能看起来像是*元素属性（Attribute）*的名字，但它不是。
 								要理解它们的不同点，我们必须尝试用另一种方式来审视模板中的 HTML。
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+								### A new mental model
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+								### 新的思维模型
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+								With all the power of data binding and the ability to extend the HTML vocabulary
 								with custom markup, it is tempting to think of template HTML as *HTML Plus*.
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+								数据绑定的威力和允许用自定义标记扩展 HTML 词汇的能力，容易误导我们把模板 HTML 当成 *HTML+*。
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+								It really *is* HTML Plus.
 								But it's also significantly different than the HTML you're used to.
 								It requires a new mental model.
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+								它其实*就是* HTML+。
 								但它也跟我们熟悉的 HTML 有着显著的不同。
 								我们需要一种新的思维模型。
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+								In the normal course of HTML development, you create a visual structure with HTML elements, and
 								you modify those elements by setting element attributes with string constants.
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+								在正常的 HTML 开发过程中，我们使用 HTML 元素创建视觉结构，
 								通过把字符串常量设置到元素的 attribute 来修改那些元素。
-												build(aio): new migration

											
										
										
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+								<code-example path="template-syntax/src/app/app.component.html" region="img+button" title="src/app/app.component.html" linenums="false">
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+								</code-example>
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 								You still create a structure and initialize attribute values this way in Angular templates.
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+								在 Angular 模板中，我们仍使用同样的方式来创建结构和初始化 attribute 值。
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+								Then you learn to create new elements with components that encapsulate HTML
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+								and drop them into templates as if they were native HTML elements.
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 								然后，用封装了 HTML 的组件创建新元素，并把它们当作原生 HTML 元素在模板中使用。
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+								<code-example path="template-syntax/src/app/app.component.html" region="hero-detail-1" title="src/app/app.component.html" linenums="false">
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+								</code-example>
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 								That's HTML Plus.
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+								这就是 HTML+。
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+								Then you learn about data binding. The first binding you meet might look like this:
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+								现在开始学习数据绑定。我们碰到的第一种数据绑定是这样的：
-												build(aio): new migration

											
										
										
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+								<code-example path="template-syntax/src/app/app.component.html" region="disabled-button-1" title="src/app/app.component.html" linenums="false">
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+								</code-example>
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 								You'll get to that peculiar bracket notation in a moment. Looking beyond it,
 								your intuition suggests that you're binding to the button's `disabled` attribute and setting
 								it to the current value of the component's `isUnchanged` property.
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+								过会儿再认识那个怪异的方括号记法。直觉告诉我们，我们正在绑定按钮的 `disabled` attribute。
 								  并把它设置为组件的 `isUnchanged` 属性的当前值。
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+								Your intuition is incorrect! Your everyday HTML mental model is misleading.
 								In fact, once you start data binding, you are no longer working with HTML *attributes*. You aren't setting attributes.
 								You are setting the *properties* of DOM elements, components, and directives.
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+								但我们的直觉是错的！日常的 HTML 思维模式在误导我们。
 								实际上，一旦开始数据绑定，就不再跟 HTML attribute 打交道了。
 								这里不是设置 attribute，而是设置 DOM 元素、组件和指令的 property。
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+								<div class="l-sub-section">
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+								### HTML attribute vs. DOM property
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+								### HTML attribute 与 DOM property 的对比
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+								The distinction between an HTML attribute and a DOM property is crucial to understanding how Angular binding works.
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+								要想理解 Angular 绑定如何工作，重点是搞清 HTML attribute 和 DOM property 之间的区别。
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+								**Attributes are defined by HTML. Properties are defined by the DOM (Document Object Model).**
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+								**attribute 是由 HTML 定义的。property 是由 DOM (Document Object Model) 定义的。**
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+								* A few HTML attributes have 1:1 mapping to properties. `id` is one example.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   少量 HTML attribute 和 property 之间有着 1:1 的映射，如 `id`。
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+								* Some HTML attributes don't have corresponding properties. `colspan` is one example.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   有些 HTML attribute 没有对应的 property，如 `colspan`。
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+								* Some DOM properties don't have corresponding attributes. `textContent` is one example.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   有些 DOM property 没有对应的 attribute，如 `textContent`。
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+								* Many HTML attributes appear to map to properties ... but not in the way you might think!
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   大量 HTML attribute 看起来映射到了 property…… 但却不像我们想的那样！
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+								That last category is confusing until you grasp this general rule:
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+								最后一类尤其让人困惑…… 除非我们能理解这个普遍原则：
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+								**Attributes *initialize* DOM properties and then they are done.
 								Property values can change; attribute values can't.**
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											2017-07-22 23:51:25 -04:00
+								**attribute *初始化* DOM property，然后它们的任务就完成了。property 的值可以改变；attribute 的值不能改变。**
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+								For example, when the browser renders `<input type="text" value="Bob">`, it creates a
 								corresponding DOM node with a `value` property *initialized* to "Bob".
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											2018-03-20 05:09:18 -04:00
+								例如，当浏览器渲染 `<input type="text" value="Bob">` 时，它将创建相应 DOM 节点，
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								它的 `value` 这个 property 被*初始化为* “Bob”。
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+								When the user enters "Sally" into the input box, the DOM element `value` *property* becomes "Sally".
 								But the HTML `value` *attribute* remains unchanged as you discover if you ask the input element
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								about that attribute: `input.getAttribute('value')` returns "Bob".
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-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								当用户在输入框中输入 “Sally” 时，DOM 元素的 `value` 这个 *property* 变成了 “Sally”。
 								但是该 HTML 的 `value` 这个 *attribute* 保持不变。如果我们读取 input 元素的 attribute，就会发现确实没变：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								`input.getAttribute('value') // 返回 "Bob"`。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								The HTML attribute `value` specifies the *initial* value; the DOM `value` property is the *current* value.
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								HTML 的 `value` 这个 attribute 指定了*初始*值；DOM 的 `value` 这个 property 是*当前*值。
-												docs(aio): merge latest chinese translations

											
										
										
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											2017-02-22 13:09:39 -05:00
+								The `disabled` attribute is another peculiar example. A button's `disabled` *property* is
 								`false` by default so the button is enabled.
 								When you add the `disabled` *attribute*, its presence alone initializes the  button's `disabled` *property* to `true`
 								so the button is disabled.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`disabled` 这个 attribute 是另一种特例。按钮的 `disabled` 这个 *property* 是 `false`，因为默认情况下按钮是可用的。
 								当我们添加 `disabled` 这个 *attribute* 时，只要它出现了按钮的 `disabled` 这个 *property* 就初始化为 `true`，于是按钮就被禁用了。
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											2017-02-22 13:09:39 -05:00
+								Adding and removing the `disabled` *attribute* disables and enables the button. The value of the *attribute* is irrelevant,
 								which is why you cannot enable a button by writing `<button disabled="false">Still Disabled</button>`.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								添加或删除 `disabled` 这个 *attribute*会禁用或启用这个按钮。但 *attribute* 的值无关紧要，这就是我们为什么没法通过
 								`<button disabled="false">仍被禁用</button>` 这种写法来启用按钮。
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											2017-07-22 23:51:25 -04:00
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											2017-02-22 13:09:39 -05:00
+								Setting the button's `disabled` *property*  (say, with an Angular binding) disables or enables the button.
 								The value of the *property* matters.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								设置按钮的 `disabled` 这个 *property*（如，通过 Angular 绑定）可以禁用或启用这个按钮。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								这就是 *property* 的价值。
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											2017-02-22 13:09:39 -05:00
+								**The HTML attribute and the DOM property are not the same thing, even when they have the same name.**
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								**就算名字相同，HTML attribute 和 DOM property 也不是同一样东西。**
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
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											2017-02-22 13:09:39 -05:00
+								This fact bears repeating:
 								**Template binding works with *properties* and *events*, not *attributes*.**
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								这句话值得再强调一次：
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											2017-07-22 23:51:25 -04:00
+								**模板绑定是通过 *property* 和*事件*来工作的，而不是 *attribute*。**
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="callout is-helpful">
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											2017-02-22 13:09:39 -05:00
-												fix: 翻译《路由与导航》中遗漏的部分
fix: 把 header 修复成双行对照的格式

											
										
										
											2018-03-13 21:13:52 -04:00
+								<header>A world without attributes</header>
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												fix: 翻译《路由与导航》中遗漏的部分
fix: 把 header 修复成双行对照的格式

											
										
										
											2018-03-13 21:13:52 -04:00
+								<header>没有 attribute 的世界</header>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
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											2017-02-22 13:09:39 -05:00
+								In the world of Angular, the only role of attributes is to initialize element and directive state.
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								When you write a data binding, you're dealing exclusively with properties and events of the target object.
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											2017-02-22 13:09:39 -05:00
+								HTML attributes effectively disappear.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								在 Angular 的世界中，attribute 唯一的作用是用来初始化元素和指令的状态。
 								当进行数据绑定时，只是在与元素和指令的 property 和事件打交道，而 attribute 就完全靠边站了。
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
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											2017-02-22 13:09:39 -05:00
 								With this model firmly in mind, read on to learn about binding targets.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								把这个思维模型牢牢的印在脑子里，接下来，学习什么是绑定目标。
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											2017-02-22 13:09:39 -05:00
+								### Binding targets
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 绑定目标
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											2017-02-22 13:09:39 -05:00
+								The **target of a data binding** is something in the DOM.
 								Depending on the binding type, the target can be an
 								(element | component | directive) property, an
 								(element | component | directive) event, or (rarely) an attribute name.
 								The following table summarizes:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								**数据绑定的目标**是 DOM 中的某些东西。
 								这个目标可能是（元素 | 组件 | 指令的）property、（元素 | 组件 | 指令的）事件，或(极少数情况下) attribute 名。
 								下面是的汇总表：
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											2017-02-22 13:09:39 -05:00
+								<style>
 								  td, th {vertical-align: top}
 								</style>
 								<table width="100%">
 								  <col width="10%">
 								  </col>
 								  <col width="15%">
 								  </col>
 								  <col width="75%">
 								  </col>
-												fix: 人工修订自动翻译

											
										
										
											2018-03-06 23:26:05 -05:00
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											2017-02-22 13:09:39 -05:00
+								  <tr>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
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+								    <th>
-												docs(aio): merge latest chinese translations

											
										
										
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-												fix: 修正最后一版的全部翻译

											
										
										
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+								      Type
-												docs(aio): merge latest chinese translations

											
										
										
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-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      绑定类型
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+								    </th>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
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+								    <th>
-												docs(aio): merge latest chinese translations

											
										
										
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-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Target
-												docs(aio): merge latest chinese translations

											
										
										
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-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      目标
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+								    </th>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
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+								    <th>
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-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Examples
-												docs(aio): merge latest chinese translations

											
										
										
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-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      范例
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+								    </th>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
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+								  </tr>
-												fix: 人工修订自动翻译

											
										
										
											2018-03-06 23:26:05 -05:00
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+								  <tr>
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+								    <td>
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-												fix: 修正最后一版的全部翻译

											
										
										
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+								      Property
 								      属性
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											2017-07-22 23:51:25 -04:00
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+								    </td>
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											2018-03-03 08:06:01 -05:00
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+								    <td>
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-												fix: 修正自动翻译结果

											
										
										
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+								      Element&nbsp;property<br>
 								      Component&nbsp;property<br>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Directive&nbsp;property
-												fix: 修正自动翻译结果

											
										
										
											2018-03-06 22:25:56 -05:00
+								      元素的 property<br>
 								      组件的 property<br>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      指令的 property
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+								    </td>
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+								    <td>
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-												build(aio): new migration

											
										
										
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+								      <code-example path="template-syntax/src/app/app.component.html" region="property-binding-syntax-1" title="src/app/app.component.html" linenums="false">
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-												docs(aio): update migrated content from anguar.io

											
										
										
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+								      </code-example>
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+								    </td>
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+								  </tr>
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+								  <tr>
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+								    <td>
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+								      Event
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+								      事件
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+								    </td>
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+								    <td>
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+								      Element&nbsp;event<br>
 								      Component&nbsp;event<br>
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+								      Directive&nbsp;event
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正自动翻译结果

											
										
										
											2018-03-06 22:25:56 -05:00
+								      元素的事件<br>
 								      组件的事件<br>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      指令的事件
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								      <code-example path="template-syntax/src/app/app.component.html" region="event-binding-syntax-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								      </code-example>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								  </tr>
-												fix: 人工修订自动翻译

											
										
										
											2018-03-06 23:26:05 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								  <tr>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Two-way
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      双向
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Event and property
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      事件与 property
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								      <code-example path="template-syntax/src/app/app.component.html" region="2-way-binding-syntax-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								      </code-example>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								  </tr>
-												fix: 人工修订自动翻译

											
										
										
											2018-03-06 23:26:05 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								  <tr>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								      Attribute
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Attribute
 								      (the&nbsp;exception)
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      attribute（例外情况）
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								      <code-example path="template-syntax/src/app/app.component.html" region="attribute-binding-syntax-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								      </code-example>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								  </tr>
-												fix: 人工修订自动翻译

											
										
										
											2018-03-06 23:26:05 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								  <tr>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Class
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      CSS 类
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      <code>class</code> property
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								      <code-example path="template-syntax/src/app/app.component.html" region="class-binding-syntax-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								      </code-example>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								  </tr>
-												fix: 人工修订自动翻译

											
										
										
											2018-03-06 23:26:05 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								  <tr>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      Style
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      样式
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								      <code>style</code> property
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    <td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								      <code-example path="template-syntax/src/app/app.component.html" region="style-binding-syntax-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								      </code-example>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								    </td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								  </tr>
-												fix: 人工修订自动翻译

											
										
										
											2018-03-06 23:26:05 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								</table>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								With this broad view in mind, you're ready to look at binding types in detail.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
 								放开眼界，我们来看看每种绑定类型的具体情况。
-												fix: all "back to top" links

											
										
										
											2017-07-30 10:11:36 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a property-binding}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## Property binding ( <span class="syntax">[property]</span> )
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 属性绑定 ( <span class="syntax">[属性名]</span> )
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Write a template **property binding** to set a property of a view element.
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								The binding sets the property to the value of a [template expression](guide/template-syntax#template-expressions).
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								当要把视图元素的属性 (property) 设置为[模板表达式](guide/template-syntax#template-expressions)时，就要写模板的**属性 (property) 绑定**。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The most common property binding sets an element property to a component property value. An example is
 								binding the `src` property of an image element to a component's `heroImageUrl` property:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								最常用的属性绑定是把元素属性设置为组件属性的值。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								下面这个例子中，image 元素的 `src` 属性会被绑定到组件的 `heroImageUrl` 属性上：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Another example is disabling a button when the component says that it `isUnchanged`:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								另一个例子是当组件说它 `isUnchanged`（未改变）时禁用按钮：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Another is setting a property of a directive:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								另一个例子是设置指令的属性：
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-3" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Yet another is setting the model property of a custom component (a great way
 								for parent and child components to communicate):
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								还有另一个例子是设置自定义组件的模型属性（这是父子组件之间通讯的重要途径）：
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-4" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								### One-way *in*
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 单向*输入*
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								People often describe property binding as *one-way data binding* because it flows a value in one direction,
 								from a component's data property into a target element property.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								人们经常把属性绑定描述成*单向数据绑定*，因为值的流动是单向的，从组件的数据属性流动到目标元素的属性。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You cannot use property binding to pull values *out* of the target element.
 								You can't bind to a property of the target element to _read_ it. You can only _set_ it.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								不能使用属性绑定来从目标元素拉取值，也不能绑定到目标元素的属性来读取它。只能设置它。
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Similarly, you cannot use property binding to *call* a method on the target element.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								也不能使用属性 绑定 来*调用*目标元素上的方法。
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								If the element raises events, you can listen to them with an [event binding](guide/template-syntax#event-binding).
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								如果这个元素触发了事件，可以通过[事件绑定](guide/template-syntax#event-binding)来监听它们。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								If you must read a target element property or call one of its methods,
 								you'll need a different technique.
 								See the API reference for
-												docs(aio): fix lots of broken links

Closes #16317

											
										
										
											2017-04-30 16:10:32 -04:00
+								[ViewChild](api/core/ViewChild) and
 								[ContentChild](api/core/ContentChild).
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								如果必须读取目标元素上的属性或调用它的某个方法，得用另一种技术。
 								参见 API 参考手册中的
-												Merge remote-tracking branch 'en/master' into aio

# Conflicts:
#	aio/content/guide/ajs-quick-reference.md
#	aio/content/guide/animations.md
#	aio/content/guide/aot-compiler.md
#	aio/content/guide/architecture.md
#	aio/content/guide/attribute-directives.md
#	aio/content/guide/bootstrapping.md
#	aio/content/guide/browser-support.md
#	aio/content/guide/cb-index.md
#	aio/content/guide/change-log.md
#	aio/content/guide/cheatsheet.md
#	aio/content/guide/cli-quickstart.md
#	aio/content/guide/component-interaction.md
#	aio/content/guide/component-styles.md
#	aio/content/guide/dependency-injection-in-action.md
#	aio/content/guide/dependency-injection.md
#	aio/content/guide/deployment.md
#	aio/content/guide/displaying-data.md
#	aio/content/guide/dynamic-component-loader.md
#	aio/content/guide/dynamic-form.md
#	aio/content/guide/form-validation.md
#	aio/content/guide/forms.md
#	aio/content/guide/glossary.md
#	aio/content/guide/hierarchical-dependency-injection.md
#	aio/content/guide/i18n.md
#	aio/content/guide/index.md
#	aio/content/guide/learning-angular.md
#	aio/content/guide/lifecycle-hooks.md
#	aio/content/guide/ngmodule-faq.md
#	aio/content/guide/ngmodule.md
#	aio/content/guide/npm-packages.md
#	aio/content/guide/pipes.md
#	aio/content/guide/quickstart.md
#	aio/content/guide/reactive-forms.md
#	aio/content/guide/router.md
#	aio/content/guide/security.md
#	aio/content/guide/server-communication.md
#	aio/content/guide/set-document-title.md
#	aio/content/guide/setup-systemjs-anatomy.md
#	aio/content/guide/setup.md
#	aio/content/guide/structural-directives.md
#	aio/content/guide/styleguide.md
#	aio/content/guide/template-syntax.md
#	aio/content/guide/testing.md
#	aio/content/guide/ts-to-js.md
#	aio/content/guide/typescript-configuration.md
#	aio/content/guide/upgrade.md
#	aio/content/guide/user-input.md
#	aio/content/guide/visual-studio-2015.md
#	aio/content/guide/webpack.md
#	aio/content/navigation.json
#	aio/content/tutorial/index.md
#	aio/content/tutorial/toh-pt1.md
#	aio/content/tutorial/toh-pt2.md
#	aio/content/tutorial/toh-pt3.md
#	aio/content/tutorial/toh-pt4.md
#	aio/content/tutorial/toh-pt5.md
#	aio/content/tutorial/toh-pt6.md
#	aio/package.json
#	aio/src/styles/main.scss
#	aio/transforms/angular.io-package/index.js

											
										
										
											2017-07-29 12:03:22 -04:00
+								[ViewChild](api/core/ViewChild) 和
 								[ContentChild](api/core/ContentChild)。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								### Binding target
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								### 绑定目标
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								An element property between enclosing square brackets identifies the target property.
 								The target property in the following code is the image element's `src` property.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								包裹在方括号中的元素属性名标记着目标属性。下列代码中的目标属性是 image 元素的 `src` 属性。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Some people prefer the `bind-` prefix alternative, known as the *canonical form*:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								有些人喜欢用 `bind-` 前缀的可选形式，并称之为*规范形式*：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-5" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The target name is always the name of a property, even when it appears to be the name of something else.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You see `src` and may think it's the name of an attribute. No. It's the name of an image element property.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								目标的名字总是 property 的名字。即使它看起来和别的名字一样。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								看到 `src` 时，可能会把它当做 attribute。不！它不是！它是 image 元素的 property 名。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Element properties may be the more common targets,
 								but Angular looks first to see if the name is a property of a known directive,
 								as it is in the following example:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								元素属性可能是最常见的绑定目标，但 Angular 会先去看这个名字是否是某个已知指令的属性名，就像下面的例子中一样：
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-3" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								Technically, Angular is matching the name to a directive [input](guide/template-syntax#inputs-outputs),
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								one of the property names listed in the directive's `inputs` array or a property decorated with `@Input()`.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Such inputs map to the directive's own properties.
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								严格来说，Angular 正在匹配指令的[输入属性](guide/template-syntax#inputs-outputs)的名字。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								这个名字是指令的 `inputs` 数组中所列的名字，或者是带有 `@Input()` 装饰器的属性。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								这些输入属性被映射为指令自己的属性。
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
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-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
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+								If the name fails to match a property of a known directive or element, Angular reports an “unknown directive” error.
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+								如果名字没有匹配上已知指令或元素的属性，Angular 就会报告“未知指令”的错误。
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+								### Avoid side effects
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
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+								### 消除副作用
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
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+								As mentioned previously, evaluation of a template expression should have no visible side effects.
 								The expression language itself does its part to keep you safe.
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+								You can't assign a value to anything in a property binding expression nor use the increment and decrement operators.
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+								正如以前讨论过的，模板表达式的计算不能有可见的副作用。表达式语言本身可以提供一部分安全保障。
 								  不能在属性绑定表达式中对任何东西赋值，也不能使用自增、自减运算符。
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Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
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+								Of course, the expression might invoke a property or method that has side effects.
-												fix: 修正最后一版的全部翻译

											
										
										
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+								Angular has no way of knowing that or stopping you.
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 								当然，表达式可能会调用具有副作用的属性或方法。但 Angular 没法知道这一点，也没法阻止我们。
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 								The expression could call something like `getFoo()`. Only you know what `getFoo()` does.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								If `getFoo()` changes something and you happen to be binding to that something, you risk an unpleasant experience.
 								Angular may or may not display the changed value. Angular may detect the change and throw a warning error.
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+								In general, stick to data properties and to methods that return values and do no more.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
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+								表达式中可以调用像 `getFoo()` 这样的方法。只有我们知道 `getFoo()` 干了什么。
 								如果 `getFoo()` 改变了某个东西，恰好又绑定到个这个东西，我们就可能把自己坑了。
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+								Angular 可能显示也可能不显示变化后的值。Angular 还可能检测到变化，并抛出警告型错误。
 								一般建议是，只绑定数据属性和那些只返回值而不做其它事情的方法。
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+								### Return the proper type
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
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-												docs(aio): merge latest chinese translations

											
										
										
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+								### 返回恰当的类型
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+								The template expression should evaluate to the type of value expected by the target property.
 								Return a string if the target property expects a string.
 								Return a number if the target property expects a number.
 								Return an object if the target property expects an object.
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+								模板表达式应该返回目标属性所需类型的值。
 								如果目标属性想要个字符串，就返回字符串。
 								如果目标属性想要个数字，就返回数字。
 								如果目标属性想要个对象，就返回对象。
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+								The `hero` property of the `HeroDetail` component expects a `Hero` object, which is exactly what you're sending in the property binding:
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+								`HeroDetail` 组件的 `hero` 属性想要一个 `Hero` 对象，那就在属性绑定中精确地给它一个 `Hero` 对象：
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-												build(aio): new migration

											
										
										
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+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-4" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
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-												docs(aio): update migrated content from anguar.io

											
										
										
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+								</code-example>
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 								### Remember the brackets
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
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+								### 别忘了方括号
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+								The brackets tell Angular to evaluate the template expression.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								If you omit the brackets, Angular treats the string as a constant
 								and *initializes the target property* with that string.
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+								It does *not* evaluate the string!
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+								方括号告诉 Angular 要计算模板表达式。
 								如果忘了加方括号，Angular 会把这个表达式当做字符串常量看待，并用该字符串来*初始化目标属性*。
 								它*不会*计算这个字符串。
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+								Don't make the following mistake:
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+								不要出现这样的失误：
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+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-6" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
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-												docs(aio): update migrated content from anguar.io

											
										
										
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+								</code-example>
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 								{@a one-time-initialization}
-												build(aio): new migration

											
										
										
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+								### One-time string initialization
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
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-												docs(aio): merge latest chinese translations

											
										
										
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+								### 一次性字符串初始化
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+								You *should* omit the brackets when all of the following are true:
-												build(aio): new migration

											
										
										
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+								当满足下列条件时，*应该*省略括号：
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+								* The target property accepts a string value.
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-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   目标属性接受字符串值。
-												docs(aio): merge latest chinese translations

											
										
										
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+								* The string is a fixed value that you can bake into the template.
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-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   字符串是个固定值，可以直接合并到模块中。
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+								* This initial value never changes.
-												fix: 修正最后一版的全部翻译

											
										
										
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+								   这个初始值永不改变。
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+								You routinely initialize attributes this way in standard HTML, and it works
 								just as well for directive and component property initialization.
 								The following example initializes the `prefix` property of the `HeroDetailComponent` to a fixed string,
 								not a template expression. Angular sets it and forgets about it.
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+								我们经常这样在标准 HTML 中用这种方式初始化 attribute，这种方式也可以用在初始化指令和组件的属性。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								下面这个例子把 `HeroDetailComponent` 的 `prefix` 属性初始化为固定的字符串，而不是模板表达式。Angular 设置它，然后忘记它。
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-												build(aio): new migration

											
										
										
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+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-7" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
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+								</code-example>
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 								The `[hero]` binding, on the other hand, remains a live binding to the component's `currentHero` property.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								作为对比，`[hero]` 绑定是组件的 `currentHero` 属性的活绑定，它会一直随着更新。
-												docs(aio): merge latest chinese translations

											
										
										
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-												docs(aio): fix lots of broken links

Closes #16317

											
										
										
											2017-04-30 16:10:32 -04:00
+								{@a property-binding-or-interpolation}
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											2017-02-22 13:09:39 -05:00
+								### Property binding or interpolation?
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 属性绑定还是插值表达式？
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								You often have a choice between interpolation and property binding.
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+								The following binding pairs do the same thing:
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+								我们通常得在插值表达式和属性绑定之间做出选择。
 								下列这几对绑定做的事情完全相同：
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+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-vs-interpolation" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
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-												docs(aio): update migrated content from anguar.io

											
										
										
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+								</code-example>
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 								_Interpolation_ is a convenient alternative to _property binding_ in many cases.
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+								在多数情况下，插值表达式是更方便的备选项。
 								实际上，在渲染视图之前，Angular 把这些插值表达式翻译成相应的属性绑定。
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								When rendering data values as strings, there is no technical reason to prefer one form to the other.
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+								You lean toward readability, which tends to favor interpolation.
 								You suggest establishing coding style rules and choosing the form that
 								both conforms to the rules and feels most natural for the task at hand.
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+								当要渲染的数据类型是字符串时，没有技术上的理由证明哪种形式更好。
 								我们倾向于可读性，所以倾向于插值表达式。
 								建议建立代码风格规则，选择一种形式，
 								这样，既遵循了规则，又能让手头的任务做起来更自然。
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+								When setting an element property to a non-string data value, you must use _property binding_.
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+								但数据类型不是字符串时，就必须使用*属性绑定*了。
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+								#### Content security
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
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-												docs(aio): merge latest chinese translations

											
										
										
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+								#### 内容安全
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+								Imagine the following *malicious content*.
-												docs(aio): merge latest chinese translations

											
										
										
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+								假设下面的*恶意内容*
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+								<code-example path="template-syntax/src/app/app.component.ts" region="evil-title" title="src/app/app.component.ts" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
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-												docs(aio): update migrated content from anguar.io

											
										
										
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+								</code-example>
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 								Fortunately, Angular data binding is on alert for dangerous HTML.
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+								It [*sanitizes*](guide/security#sanitization-and-security-contexts) the values before displaying them.
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+								It **will not** allow HTML with script tags to leak into the browser, neither with interpolation
 								nor property binding.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								幸运的是，Angular 数据绑定对危险 HTML 有防备。
 								在显示它们之前，它对内容先进行*消毒*。
 								不管是插值表达式还是属性绑定，都**不会**允许带有 script 标签的 HTML 泄漏到浏览器中。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="property-binding-vs-interpolation-sanitization" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Interpolation handles the script tags differently than property binding but both approaches render the
 								content harmlessly.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								插值表达式处理 script 标签与属性绑定有所不同，但是二者都只渲染没有危害的内容。
-												docs(aio): image sweep (#16609)

* fix(aio): allow code blocks to clear floated images

Previously the negative margin on the code headings were causing
floated images to overlay the start of a code block. Now all code block
successfully clear all floated elements.

* feat(aio): add a `.clear` class for clearing floating images

* fix(aio): tidy up image styles

The css rules for `img.right` and `img.left` allow authors easy
access to floating an image on the left or right, respectively.

The `.image-display` rule which was always found on a figure
has been simplified so that all figures have this styling. It is very
unlikely that a figure will be used outside the content area; and
at this time it seems like `figure` is as good an indicator that we
want this kind of styling as anything.

Now that images are all tagged with width and height values, we cannot
assume to modify these dimensions via CSS as it can cause the image to
lose its correct proportions.  Until we find a better solition we must set
`height` to `auto` when the screen width is below 1300px to ensure that
these images maintain their proportions as they get shrunk to fit.

* docs(aio): general tidy up of image HTML in guides

Previously, the guides have a lot of inline image styling and unnecessary
use of the `image-display` css class.
Images over 700px are problematic for guide docs, so those have been given
specific widths and associated heights.

* docs(aio): use correct anchor for "back to the top" link

The `#toc` anchor does not work when the page is
wide enough that the TOC is floating to the side.

* build(aio): add `#top-of-page` to path variants for link checking

Since the `#top-of-page` is outside the rendered docs
the `checkAnchorLinks` processor doesn't find them
as valid targets for links.
Adding them as a `pathVariant` solves this problem
but will still catch links to docs that do not actually exist.

* fix(aio): ensure that headings clear floated images

* fix(aio): do not force live-example embedded image to 100% size

This made them look too big, generally. Leaving them with no size means
that they will look reasonable in large viewports and switch to 100% width
in narrow viewports.

											
										
										
											2017-05-09 18:53:32 -04:00
+								<figure>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								  <img src='generated/images/guide/template-syntax/evil-title.png' alt="evil title made safe">
 								</figure>
-												docs(aio): ensure blank lines before HTML blocks in markdown

											
										
										
											2017-03-30 15:04:18 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								{@a other-bindings}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								## Attribute, class, and style bindings
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## attribute、class 和 style 绑定
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								The template syntax provides specialized one-way bindings for scenarios less well suited to property binding.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								模板语法为那些不太适合使用属性绑定的场景提供了专门的单向数据绑定形式。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								### Attribute binding
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### attribute 绑定
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								You can set the value of an attribute directly with an **attribute binding**.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								可以通过**attribute 绑定**来直接设置 attribute 的值。
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								This is the only exception to the rule that a binding sets a target property.
 								This is the only binding that creates and sets an attribute.
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								这是“绑定到目标属性 (property)”这条规则中唯一的例外。这是唯一的能创建和设置 attribute 的绑定形式。
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								This guide stresses repeatedly that setting an element property with a property binding
 								is always preferred to setting the attribute with a string. Why does Angular offer attribute binding?
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								本章中，通篇都在说通过属性绑定来设置元素的属性总是好于用字符串设置 attribute。为什么 Angular 还提供了 attribute 绑定呢？
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								**You must use attribute binding when there is no element property to bind.**
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								**因为当元素没有属性可绑的时候，就必须使用 attribute 绑定。**
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								Consider the [ARIA](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA),
 								[SVG](https://developer.mozilla.org/en-US/docs/Web/SVG), and
 								table span attributes. They are pure attributes.
 								They do not correspond to element properties, and they do not set element properties.
 								There are no property targets to bind to.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								考虑 [ARIA](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA)，
 								  [SVG](https://developer.mozilla.org/en-US/docs/Web/SVG) 和 table 中的 colspan/rowspan 等 attribute。
 								  它们是纯粹的 attribute，没有对应的属性可供绑定。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								This fact becomes painfully obvious when you write something like this.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								如果想写出类似下面这样的东西，现状会令我们痛苦：
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								<code-example language="html">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								  &lt;tr&gt;&lt;td colspan="{{1 + 1}}"&gt;Three-Four&lt;/td&gt;&lt;/tr&gt;
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								</code-example>
 								And you get this error:
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								会得到这个错误：
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								<code-example format="nocode">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								  Template parse errors:
 								  Can't bind to 'colspan' since it isn't a known native property
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								</code-example>
 								As the message says, the `<td>` element does not have a `colspan` property.
 								It has the "colspan" *attribute*, but
 								interpolation and property binding can set only *properties*, not attributes.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								正如提示中所说，`<td>` 元素没有 `colspan` 属性。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								  但是插值表达式和属性绑定只能设置*属性*，不能设置 attribute。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								You need attribute bindings to create and bind to such attributes.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								我们需要 attribute 绑定来创建和绑定到这样的 attribute。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								Attribute binding syntax resembles property binding.
 								Instead of an element property between brackets, start with the prefix **`attr`**,
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								followed by a dot (`.`) and the name of the attribute.
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								You then set the attribute value, using an expression that resolves to a string.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								attribute 绑定的语法与属性绑定类似。
 								  但方括号中的部分不是元素的属性名，而是由**`attr`**前缀，一个点 (`.`) 和 attribute 的名字组成。
 								  可以通过值为字符串的表达式来设置 attribute 的值。
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											2017-02-22 13:09:39 -05:00
+								Bind `[attr.colspan]` to a calculated value:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								这里把 `[attr.colspan]` 绑定到一个计算值：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="attrib-binding-colspan" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								Here's how the table renders:
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								这里是表格渲染出来的样子：
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								<table border="1px">
-												fix: 修正自动翻译结果

											
										
										
											2018-03-06 22:25:56 -05:00
-												fix: 人工修订自动翻译
fix: 标准化原文中的异常语句

											
										
										
											2018-03-07 00:28:58 -05:00
+								  <tr>
 								      <td colspan="2">
 								          One-Two
 								      </td>
-												fix: 修正自动翻译结果

											
										
										
											2018-03-06 22:25:56 -05:00
-												fix: 人工修订自动翻译
fix: 标准化原文中的异常语句

											
										
										
											2018-03-07 00:28:58 -05:00
+								  </tr>
-												fix: 修正自动翻译结果

											
										
										
											2018-03-06 22:25:56 -05:00
-												fix: 人工修订自动翻译
fix: 标准化原文中的异常语句

											
										
										
											2018-03-07 00:28:58 -05:00
+								  <tr>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												fix: 人工修订自动翻译
fix: 标准化原文中的异常语句

											
										
										
											2018-03-07 00:28:58 -05:00
+								      <td>
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												fix: 人工修订自动翻译
fix: 标准化原文中的异常语句

											
										
										
											2018-03-07 00:28:58 -05:00
+								          Five
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												fix: 人工修订自动翻译
fix: 标准化原文中的异常语句

											
										
										
											2018-03-07 00:28:58 -05:00
+								      </td>
 								<td>
 								    Six
 								</td>
 								  </tr>
-												fix: 修正自动翻译结果

											
										
										
											2018-03-06 22:25:56 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								 </table>
 								One of the primary use cases for attribute binding
 								is to set ARIA attributes, as in this example:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								attribute 绑定的主要用例之一是设置 ARIA attribute（译注：ARIA 指可访问性，用于给残障人士访问互联网提供便利），
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								就像这个例子中一样：
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="attrib-binding-aria" title="src/app/app.component.html" linenums="false">
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								</code-example>
-												fix: all "back to top" links

											
										
										
											2017-07-30 10:11:36 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								### Class binding
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### CSS 类绑定
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											2017-02-22 13:09:39 -05:00
+								You can add and remove CSS class names from an element's `class` attribute with
 								a **class binding**.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								借助 **CSS 类绑定**，可以从元素的 `class` attribute 上添加和移除 CSS 类名。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Class binding syntax resembles property binding.
 								Instead of an element property between brackets, start with the prefix `class`,
 								optionally followed by a dot (`.`) and the name of a CSS class: `[class.class-name]`.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								CSS 类绑定绑定的语法与属性绑定类似。
 								但方括号中的部分不是元素的属性名，而是由**`class`**前缀，一个点 (`.`)和 CSS 类的名字组成，
 								其中后两部分是可选的。形如：`[class.class-name]`。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The following examples show how to add and remove the application's "special" class
 								with class bindings.  Here's how to set the attribute without binding:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								下列例子示范了如何通过 CSS 类绑定来添加和移除应用的 "special" 类。不用绑定直接设置 attribute 时是这样的：
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="class-binding-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								You can replace that with a binding to a string of the desired class names; this is an all-or-nothing, replacement binding.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								可以把它改写为绑定到所需 CSS 类名的绑定；这是一个或者全有或者全无的替换型绑定。
 								（译注：即当 badCurly 有值时 class 这个 attribute 设置的内容会被完全覆盖）
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="class-binding-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Finally, you can bind to a specific class name.
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								Angular adds the class when the template expression evaluates to truthy.
 								It removes the class when the expression is falsy.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								最后，可以绑定到特定的类名。
 								  当模板表达式的求值结果是真值时，Angular 会添加这个类，反之则移除它。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="class-binding-3" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								While this is a fine way to toggle a single class name,
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								the [NgClass directive](guide/template-syntax#ngClass) is usually preferred when managing multiple class names at the same time.
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								虽然这是切换单一类名的好办法，但我们通常更喜欢使用 [NgClass 指令](guide/template-syntax#ngClass) 来同时管理多个类名。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								### Style binding
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 样式绑定
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You can set inline styles with a **style binding**.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								通过**样式绑定**，可以设置内联样式。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Style binding syntax resembles property binding.
 								Instead of an element property between brackets, start with the prefix `style`,
 								followed by a dot (`.`) and the name of a CSS style property: `[style.style-property]`.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								样式绑定的语法与属性绑定类似。
 								但方括号中的部分不是元素的属性名，而由**`style`**前缀，一个点 (`.`)和 CSS 样式的属性名组成。
 								形如：`[style.style-property]`。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="style-binding-1" title="src/app/app.component.html" linenums="false">
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								</code-example>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								Some style binding styles have a unit extension.
 								The following example conditionally sets the font size in  “em” and “%” units .
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 合并第二版的翻译

											
										
										
											2018-03-07 01:35:57 -05:00
+								有些样式绑定中的样式带有单位。在这里，以根据条件用 “em” 和 “%” 来设置字体大小的单位。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="style-binding-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								While this is a fine way to set a single style,
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								the [NgStyle directive](guide/template-syntax#ngStyle) is generally preferred when setting several inline styles at the same time.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								虽然这是设置单一样式的好办法，但我们通常更喜欢使用 [NgStyle 指令](guide/template-syntax#ngStyle) 来同时设置多个内联样式。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Note that a _style property_ name can be written in either
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								[dash-case](guide/glossary#dash-case), as shown above, or
 								[camelCase](guide/glossary#camelcase), such as `fontSize`.
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								注意，_样式属性_命名方法可以用[中线命名法](guide/glossary#dash-case)，像上面的一样
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								    也可以用[驼峰式命名法](guide/glossary#camelcase)，如 `fontSize`。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a event-binding}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## Event binding  ( <span class="syntax">(event)</span> )
-												feat: add auto checker
fix: some translations found by auto checker

											
										
										
											2018-03-01 09:19:59 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 事件绑定  ( <span class="syntax">(事件名)</span> )
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The bindings directives you've met so far flow data in one direction: **from a component to an element**.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								前面遇到的绑定的数据流都是单向的：**从组件到元素**。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								Users don't just stare at the screen. They enter text into input boxes. They pick items from lists.
 								They click buttons. Such user actions may result in a flow of data in the opposite direction:
 								**from an element to a component**.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								但用户不会只盯着屏幕看。他们会在输入框中输入文本。他们会从列表中选取条目。
 								他们会点击按钮。这类用户动作可能导致反向的数据流：*从元素到组件*。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								The only way to know about a user action is to listen for certain events such as
 								keystrokes, mouse movements, clicks, and touches.
 								You declare your interest in user actions through Angular event binding.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								知道用户动作的唯一方式是监听某些事件，如按键、鼠标移动、点击和触摸屏幕。
 								可以通过 Angular 事件绑定来声明对哪些用户动作感兴趣。
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Event binding syntax consists of a **target event** name
 								within parentheses on the left of an equal sign, and a quoted
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								[template statement](guide/template-syntax#template-statements) on the right.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The following event binding listens for the button's click events, calling
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								the component's `onSave()` method whenever a click occurs:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								事件绑定语法由等号左侧带圆括号的**目标事件**和右侧引号中的[模板语句](guide/template-syntax#template-statements)组成。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								下面事件绑定监听按钮的点击事件。每当点击发生时，都会调用组件的 `onSave()` 方法。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="event-binding-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								### Target event
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 目标事件
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								A **name between parentheses** &mdash; for example, `(click)` &mdash;
 								identifies the target event. In the following example, the target is the button's click event.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								**圆括号中的名称** —— 比如 `(click)` —— 标记出目标事件。在下面例子中，目标是按钮的 click 事件。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="event-binding-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Some people prefer the `on-` prefix alternative, known as the **canonical form**:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								有些人更喜欢带 `on-` 前缀的备选形式，称之为**规范形式**：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="event-binding-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Element events may be the more common targets, but Angular looks first to see if the name matches an event property
 								of a known directive, as it does in the following example:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								元素事件可能是更常见的目标，但 Angular 会先看这个名字是否能匹配上已知指令的事件属性，就像下面这个例子：
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="event-binding-3" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								The `myClick` directive is further described in the section
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								on [aliasing input/output properties](guide/template-syntax#aliasing-io).
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								更多关于该 `myClick` 指令的解释，见[给输入/输出属性起别名](guide/template-syntax#aliasing-io)。
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								If the name fails to match an element event or an output property of a known directive,
 								Angular reports an “unknown directive” error.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								如果这个名字没能匹配到元素事件或已知指令的输出属性，Angular 就会报“未知指令”错误。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								### *$event* and event handling statements
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### *$event* 和事件处理语句
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								In an event binding, Angular sets up an event handler for the target event.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								在事件绑定中，Angular 会为目标事件设置事件处理器。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								When the event is raised, the handler executes the template statement.
 								The template statement typically involves a receiver, which performs an action
 								in response to the event, such as storing a value from the HTML control
 								into a model.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								当事件发生时，这个处理器会执行模板语句。
 								典型的模板语句通常涉及到响应事件执行动作的接收器，例如从 HTML 控件中取得值，并存入模型。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								The binding conveys information about the event, including data values, through
 								an **event object named `$event`**.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								绑定会通过**名叫 `$event` 的事件对象**传递关于此事件的信息（包括数据值）。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The shape of the event object is determined by the target event.
 								If the target event is a native DOM element event, then `$event` is a
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								[DOM event object](https://developer.mozilla.org/en-US/docs/Web/Events),
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								with properties such as `target` and `target.value`.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								事件对象的形态取决于目标事件。如果目标事件是原生 DOM 元素事件，
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`$event` 就是 [DOM 事件对象](https://developer.mozilla.org/en-US/docs/Web/Events)，它有像 `target` 和 `target.value` 这样的属性。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Consider this example:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								考虑这个范例：
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="without-NgModel" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								This code sets the input box `value` property by binding to the `name` property.
 								To listen for changes to the value, the code binds to the input box's `input` event.
 								When the user makes changes, the `input` event is raised, and the binding executes
 								the statement within a context that includes the DOM event object, `$event`.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								上面的代码在把输入框的 `value` 属性绑定到 `firstName` 属性。
 								要监听对值的修改，代码绑定到输入框的 `input` 事件。
 								当用户造成更改时，`input` 事件被触发，并在包含了 DOM 事件对象 (`$event`) 的上下文中执行这条语句。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								To update the `name` property, the changed text is retrieved by following the path `$event.target.value`.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								要更新 `firstName` 属性，就要通过路径 `$event.target.value` 来获取更改后的值。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								If the event belongs to a directive (recall that components are directives),
 								`$event` has whatever shape the directive decides to produce.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								如果事件属于指令（回想一下，组件是指令的一种），那么 `$event` 具体是什么由指令决定。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								{@a eventemitter}
 								{@a custom-event}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								### Custom events with <span class="syntax">EventEmitter</span>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 使用 <span class="syntax">EventEmitter</span> 实现自定义事件
-												docs(aio): fix lots of broken links

Closes #16317

											
										
										
											2017-04-30 16:10:32 -04:00
+								Directives typically raise custom events with an Angular [EventEmitter](api/core/EventEmitter).
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								The directive creates an `EventEmitter` and exposes it as a property.
 								The directive calls `EventEmitter.emit(payload)` to fire an event, passing in a message payload, which can be anything.
 								Parent directives listen for the event by binding to this property and accessing the payload through the `$event` object.
-												fix: many of broken links

											
										
										
											2017-07-30 00:32:56 -04:00
+								通常，指令使用 Angular [EventEmitter](api/core/EventEmitter) 来触发自定义事件。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								指令创建一个 `EventEmitter` 实例，并且把它作为属性暴露出来。
 								指令调用 `EventEmitter.emit(payload)` 来触发事件，可以传入任何东西作为消息载荷。
 								父指令通过绑定到这个属性来监听事件，并通过 `$event` 对象来访问载荷。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Consider a `HeroDetailComponent` that presents hero information and responds to user actions.
 								Although the `HeroDetailComponent` has a delete button it doesn't know how to delete the hero itself.
 								The best it can do is raise an event reporting the user's delete request.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								假设 `HeroDetailComponent` 用于显示英雄的信息，并响应用户的动作。
 								虽然 `HeroDetailComponent` 包含删除按钮，但它自己并不知道该如何删除这个英雄。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								最好的做法是触发事件来报告“删除用户”的请求。
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Here are the pertinent excerpts from that `HeroDetailComponent`:
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								下面的代码节选自 `HeroDetailComponent`：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								<code-example path="template-syntax/src/app/hero-detail.component.ts" linenums="false" title="src/app/hero-detail.component.ts (template)" region="template-1">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
 								<code-example path="template-syntax/src/app/hero-detail.component.ts" linenums="false" title="src/app/hero-detail.component.ts (deleteRequest)" region="deleteRequest">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The component defines a `deleteRequest` property that returns an `EventEmitter`.
 								When the user clicks *delete*, the component invokes the `delete()` method,
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								telling the `EventEmitter` to emit a `Hero` object.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								组件定义了 `deleteRequest` 属性，它是 `EventEmitter` 实例。
 								当用户点击*删除*时，组件会调用 `delete()` 方法，让 `EventEmitter` 发出一个 `Hero` 对象。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								Now imagine a hosting parent component that binds to the `HeroDetailComponent`'s `deleteRequest` event.
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								现在，假设有个宿主的父组件，它绑定了 `HeroDetailComponent` 的 `deleteRequest` 事件。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" linenums="false" title="src/app/app.component.html (event-binding-to-component)" region="event-binding-to-component">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								When the `deleteRequest` event fires, Angular calls the parent component's `deleteHero` method,
 								passing the *hero-to-delete* (emitted by `HeroDetail`) in the `$event` variable.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								当 `deleteRequest` 事件触发时，Angular 调用父组件的 `deleteHero` 方法，
 								在 `$event` 变量中传入*要删除的英雄*（来自 `HeroDetail`）。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								### Template statements have side effects
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 模板语句有副作用
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								The `deleteHero` method has a side effect: it deletes a hero.
 								Template statement side effects are not just OK, but expected.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`deleteHero` 方法有副作用：它删除了一个英雄。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								模板语句的副作用不仅没问题，反而正是所期望的。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								Deleting the hero updates the model, perhaps triggering other changes
 								including queries and saves to a remote server.
 								These changes percolate through the system and are ultimately displayed in this and other views.
-												fix: minor improvements

											
										
										
											2017-07-30 05:40:53 -04:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								删除这个英雄会更新模型，还可能触发其它修改，包括向远端服务器的查询和保存。
-												fix: minor improvements

											
										
										
											2017-07-30 05:40:53 -04:00
+								这些变更通过系统进行扩散，并最终显示到当前以及其它视图中。
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a two-way}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## Two-way binding ( <span class="syntax">[(...)]</span> )
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 双向数据绑定 ( <span class="syntax">[(...)]</span> )
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You often want to both display a data property and update that property when the user makes changes.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								我们经常需要显示数据属性，并在用户作出更改时更新该属性。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								On the element side that takes a combination of setting a specific element property
 								and listening for an element change event.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								在元素层面上，既要设置元素属性，又要监听元素事件变化。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								Angular offers a special _two-way data binding_ syntax for this purpose, **`[(x)]`**.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The `[(x)]` syntax combines the brackets
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								of _property binding_, `[x]`, with the parentheses of _event binding_, `(x)`.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								Angular 为此提供一种特殊的_双向数据绑定_语法：**`[(x)]`**。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`[(x)]` 语法结合了_属性绑定_的方括号 `[x]` 和_事件绑定_的圆括号 `(x)`。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="callout is-important">
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 翻译《路由与导航》中遗漏的部分
fix: 把 header 修复成双行对照的格式

											
										
										
											2018-03-13 21:13:52 -04:00
+								<header>[( )] = banana in a box</header>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 翻译《路由与导航》中遗漏的部分
fix: 把 header 修复成双行对照的格式

											
										
										
											2018-03-13 21:13:52 -04:00
+								<header>[( )] = 盒子里的香蕉</header>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Visualize a *banana in a box* to remember that the parentheses go _inside_ the brackets.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								想象*盒子里的香蕉*来记住方括号套圆括号。
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								The `[(x)]` syntax is easy to demonstrate when the element has a settable property called `x`
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								and a corresponding event named `xChange`.
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								Here's a `SizerComponent` that fits the pattern.
 								It has a `size` value property and a companion `sizeChange` event:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								当一个元素拥有可以设置的属性 `x` 和对应的事件 `xChange` 时，解释 `[(x)]` 语法就容易多了。
 								下面的 `SizerComponent` 符合这个模式。它有 `size` 属性和伴随的 `sizeChange` 事件：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/sizer.component.ts" title="src/app/sizer.component.ts">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								The initial `size` is an input value from a property binding.
 								Clicking the buttons increases or decreases the `size`, within min/max values constraints,
 								and then raises (_emits_) the `sizeChange` event with the adjusted size.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`size` 的初始值是一个输入值，来自属性绑定。（译注：注意 `size` 前面的 `@Input`）
 								点击按钮，在最小/最大值范围限制内增加或者减少 `size`。
 								然后用调整后的 `size` 触发 `sizeChange` 事件。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Here's an example in which the `AppComponent.fontSizePx` is two-way bound to the `SizerComponent`:
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								下面的例子中，`AppComponent.fontSize` 被双向绑定到 `SizerComponent`：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" linenums="false" title="src/app/app.component.html (two-way-1)" region="two-way-1">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The `AppComponent.fontSizePx` establishes the initial `SizerComponent.size` value.
 								Clicking the buttons updates the `AppComponent.fontSizePx` via the two-way binding.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The revised `AppComponent.fontSizePx` value flows through to the _style_ binding,
 								making the displayed text bigger or smaller.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`SizerComponent.size` 初始值是 `AppComponent.fontSizePx`。
 								点击按钮时，通过双向绑定更新 `AppComponent.fontSizePx`。
 								被修改的 `AppComponent.fontSizePx` 通过_样式_绑定，改变文本的显示大小。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The two-way binding syntax is really just syntactic sugar for a _property_ binding and an _event_ binding.
 								Angular _desugars_ the `SizerComponent` binding into this:
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								双向绑定语法实际上是_属性_绑定和_事件绑定_的语法糖。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								Angular 将 `SizerComponent` 的绑定分解成这样：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" linenums="false" title="src/app/app.component.html (two-way-2)" region="two-way-2">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The `$event` variable contains the payload of the `SizerComponent.sizeChange` event.
 								Angular assigns the `$event` value to the `AppComponent.fontSizePx` when the user clicks the buttons.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`$event` 变量包含了 `SizerComponent.sizeChange` 事件的荷载。
 								当用户点击按钮时，Angular 将 `$event` 赋值给 `AppComponent.fontSizePx`。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Clearly the two-way binding syntax is a great convenience compared to separate property and event bindings.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								显然，比起单独绑定属性和事件，双向数据绑定语法显得非常方便。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								It would be convenient to use two-way binding with HTML form elements like `<input>` and `<select>`.
 								However, no native HTML element follows the `x` value and `xChange` event pattern.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								我们希望能在像 `<input>` 和 `<select>` 这样的 HTML 元素上使用双向数据绑定。
 								可惜，原生 HTML 元素不遵循 `x` 值和 `xChange` 事件的模式。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								Fortunately, the Angular [_NgModel_](guide/template-syntax#ngModel) directive is a bridge that enables two-way binding to form elements.
-												fix: all "back to top" links

											
										
										
											2017-07-30 10:11:36 -04:00
 								幸运的是，Angular 以 [_NgModel_](guide/template-syntax#ngModel) 指令为桥梁，允许在表单元素上使用双向数据绑定。
-												fix: minor improvement

											
										
										
											2017-08-26 05:56:20 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a directives}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## Built-in directives
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 内置指令
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											2017-02-22 13:09:39 -05:00
+								Earlier versions of Angular included over seventy built-in directives.
 								The community contributed many more, and countless private directives
 								have been created for internal applications.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								上一版本的 Angular 中包含了超过 70 个内置指令。
 								  社区贡献了更多，这还没算为内部应用而创建的无数私有指令。
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											2017-02-22 13:09:39 -05:00
+								You don't need many of those directives in Angular.
 								You can often achieve the same results with the more capable and expressive Angular binding system.
 								Why create a directive to handle a click when you can write a simple binding such as this?
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								在新版的 Angular 中不需要那么多指令。
 								  使用更强大、更富有表现力的 Angular 绑定系统，其实可以达到同样的效果。
 								  如果能用简单的绑定达到目的，为什么还要创建指令来处理点击事件呢？
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="event-binding-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								You still benefit from directives that simplify complex tasks.
 								Angular still ships with built-in directives; just not as many.
 								You'll write your own directives, just not as many.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								我们仍然可以从简化复杂任务的指令中获益。
 								Angular 发布时仍然带有内置指令，只是没那么多了。
 								我们仍会写自己的指令，只是没那么多了。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								This segment reviews some of the most frequently used built-in directives,
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								classified as either [_attribute_ directives](guide/template-syntax#attribute-directives) or [_structural_ directives](guide/template-syntax#structural-directives).
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								下面来看一下那些最常用的内置指令。它们可分为[*属性型*指令](guide/template-syntax#attribute-directives) 或 [*结构型*指令](guide/template-syntax#structural-directives)。
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								{@a attribute-directives}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## Built-in _attribute_ directives
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 内置*属性型*指令
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Attribute directives listen to and modify the behavior of
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								other HTML elements, attributes, properties, and components.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								They are usually applied to elements as if they were HTML attributes, hence the name.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								属性型指令会监听和修改其它 HTML 元素或组件的行为、元素属性（Attribute）、DOM 属性（Property）。
 								它们通常会作为 HTML 属性的名称而应用在元素上。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								Many details are covered in the [_Attribute Directives_](guide/attribute-directives) guide.
-												docs(aio): typo in template-syntax guide (#18765)

PR Close #18765

											
										
										
											2017-08-18 01:52:38 -04:00
+								Many NgModules such as the [`RouterModule`](guide/router "Routing and Navigation")
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								and the [`FormsModule`](guide/forms "Forms") define their own attribute directives.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								This section is an introduction to the most commonly used attribute directives:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								更多的细节参见[_属性型指令_](guide/attribute-directives)一章。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								很多 Angular 模块，比如[`RouterModule`](guide/router "Routing and Navigation")和[`FormsModule`](guide/forms "Forms")都定义了自己的属性型指令。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								本节将会介绍几个最常用的属性型指令：
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								* [`NgClass`](guide/template-syntax#ngClass) - add and remove a set of CSS classes
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   [`NgClass`](guide/template-syntax#ngClass) - 添加或移除一组 CSS 类
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								* [`NgStyle`](guide/template-syntax#ngStyle) - add and remove a set of HTML styles
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   [`NgStyle`](guide/template-syntax#ngStyle) - 添加或移除一组 CSS 样式
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								* [`NgModel`](guide/template-syntax#ngModel) - two-way data binding to an HTML form element
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   [`NgModel`](guide/template-syntax#ngModel) - 双向绑定到 HTML 表单元素
-												fix: all "back to top" links

											
										
										
											2017-07-30 10:11:36 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a ngClass}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								### NgClass
 								You typically control how elements appear
 								by adding and removing CSS classes dynamically.
 								You can bind to the `ngClass` to add or remove several classes simultaneously.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								我们经常用动态添加或删除 CSS 类的方式来控制元素如何显示。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								通过绑定到 `NgClass`，可以同时添加或移除多个类。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								A [class binding](guide/template-syntax#class-binding) is a good way to add or remove a *single* class.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								[CSS 类绑定](guide/template-syntax#class-binding) 是添加或删除*单个*类的最佳途径。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="class-binding-3a" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								To add or remove *many* CSS classes at the same time, the `NgClass` directive may be the better choice.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								当想要同时添加或移除*多个* CSS 类时，`NgClass` 指令可能是更好的选择。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								Try binding `ngClass` to a key:value control object.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Each key of the object is a CSS class name; its value is `true` if the class should be added,
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								`false` if it should be removed.
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								试试把 `ngClass` 绑定到一个 key:value 形式的控制对象。这个对象中的每个 key 都是一个 CSS 类名，如果它的 value 是 `true`，这个类就会被加上，否则就会被移除。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Consider a `setCurrentClasses` component method that sets a component property,
 								`currentClasses` with an object that adds or removes three classes based on the
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								`true`/`false` state of three other component properties:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								组件方法 `setCurrentClasses` 可以把组件的属性 `currentClasses` 设置为一个对象，它将会根据三个其它组件的状态为 `true` 或 `false` 而添加或移除三个类。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.ts" region="setClasses" title="src/app/app.component.ts" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								Adding an `ngClass` property binding to `currentClasses` sets the element's classes accordingly:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								把 `NgClass` 属性绑定到 `currentClasses`，根据它来设置此元素的 CSS 类：
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgClass-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								It's up to you to call `setCurrentClasses()`, both initially and when the dependent properties change.
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								你既可以在初始化时调用 `setCurrentClassess()`，也可以在所依赖的属性变化时调用。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a ngStyle}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								### NgStyle
-												fix: translate all pure english titles

											
										
										
											2017-08-04 02:06:15 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You can set inline styles dynamically, based on the state of the component.
 								With `NgStyle` you can set many inline styles simultaneously.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								我们可以根据组件的状态动态设置内联样式。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`NgStyle` 绑定可以同时设置多个内联样式。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								A [style binding](guide/template-syntax#style-binding) is an easy way to set a *single* style value.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								[样式绑定](guide/template-syntax#style-binding)是设置*单一*样式值的简单方式。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgStyle-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								To set *many* inline styles at the same time, the `NgStyle` directive may be the better choice.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								如果要同时设置*多个*内联样式，`NgStyle` 指令可能是更好的选择。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								Try binding `ngStyle` to a key:value control object.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Each key of the object is a style name; its value is whatever is appropriate for that style.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`NgStyle` 需要绑定到一个 key:value 控制对象。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								  对象的每个 key 是样式名，它的 value 是能用于这个样式的任何值。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Consider a `setCurrentStyles` component method that sets a component property, `currentStyles`
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								with an object that defines three styles, based on the state of three other component properties:
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								来看看组件的 `setCurrentStyles` 方法，它会根据另外三个属性的状态把组件的 `currentStyles` 属性设置为一个定义了三个样式的对象：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.ts" region="setStyles" title="src/app/app.component.ts" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
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+								</code-example>
-												docs(aio): migrate content docs from angular.io

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 								Adding an `ngStyle` property binding to `currentStyles` sets the element's styles accordingly:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								把 `NgStyle` 属性绑定到 `currentStyles`，以据此设置此元素的样式：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
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+								<code-example path="template-syntax/src/app/app.component.html" region="NgStyle-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
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+								<div class="l-sub-section">
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								It's up to you to call `setCurrentStyles()`, both initially and when the dependent properties change.
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								你既可以在初始化时调用 `setCurrentStyles()`，也可以在所依赖的属性变化时调用。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
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 								{@a ngModel}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								### NgModel - Two-way binding to form elements with <span class="syntax">[(ngModel)]</span>
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### NgModel - 使用<span class="syntax">[(ngModel)]</span>双向绑定到表单元素
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								When developing data entry forms, you often both display a data property and
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								update that property when the user makes changes.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								当开发数据输入表单时，我们通常都要既显示数据属性又根据用户的更改去修改那个属性。
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Two-way data binding with the `NgModel` directive makes that easy. Here's an example:
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								使用 `NgModel` 指令进行双向数据绑定可以简化这种工作。例子如下：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" linenums="false" title="src/app/app.component.html (NgModel-1)" region="NgModel-1">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								#### _FormsModule_ is required to use _ngModel_
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								#### 使用 `ngModel` 时需要 `FormsModule`
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								Before using the `ngModel` directive in a two-way data binding,
-												docs(aio): change Angular Module to NgModule (#16964)


											
										
										
											2017-07-11 18:05:20 -04:00
+								you must import the `FormsModule` and add it to the NgModule's `imports` list.
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								Learn more about the `FormsModule` and `ngModel` in the
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								[Forms](guide/forms#ngModel) guide.
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								在使用 `ngModel` 指令进行双向数据绑定之前，我们必须导入 `FormsModule` 并把它添加到 Angular 模块的 `imports` 列表中。
 								要了解 `FormsModule` 和 `ngModel` 的更多知识，参见[表单](guide/forms#ngModel)一章。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								Here's how to import the `FormsModule` to make `[(ngModel)]` available.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								导入 `FormsModule` 并让 `[(ngModel)]` 可用的代码如下：
-												fix: add line break before `<code-example...`

											
										
										
											2017-08-03 19:39:15 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								<code-example path="template-syntax/src/app/app.module.1.ts" linenums="false" title="src/app/app.module.ts (FormsModule import)">
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								</code-example>
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								#### Inside <span class="syntax">[(ngModel)]</span>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								#### <span class="syntax">[(ngModel)]</span>内幕
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Looking back at the `name` binding, note that
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								you could have achieved the same result with separate bindings to
 								the `<input>` element's  `value` property and `input` event.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								回头看看 `name` 绑定，注意，你可以通过分别绑定到 `<input>` 元素的 `value` 属性和 `input` 事件来达到同样的效果。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="without-NgModel" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								That's cumbersome. Who can remember which element property to set and which element event emits user changes?
 								How do you extract the currently displayed text from the input box so you can update the data property?
 								Who wants to look that up each time?
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								那样显得很笨重，谁会记得该设置哪个元素属性以及当用户修改时触发哪个事件？
 								你该如何提取输入框中的文本并且更新数据属性？谁会希望每次都去查资料来确定这些？
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								That `ngModel` directive hides these onerous details behind its own  `ngModel` input and `ngModelChange` output properties.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`ngModel` 指令通过自己的输入属性 `ngModel` 和输出属性 `ngModelChange` 隐藏了那些细节。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgModel-3" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								The `ngModel` data property sets the element's value property and the `ngModelChange` event property
 								listens for changes to the element's value.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`ngModel` 输入属性会设置该元素的值，并通过 `ngModelChange` 的输出属性来监听元素值的变化。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The details are specific to each kind of element and therefore the `NgModel` directive only works for an element
-												docs(aio): fix lots of broken links

Closes #16317

											
										
										
											2017-04-30 16:10:32 -04:00
+								supported by a [ControlValueAccessor](api/forms/ControlValueAccessor)
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								that adapts an element to this protocol.
 								The `<input>` box is one of those elements.
 								Angular provides *value accessors* for all of the basic HTML form elements and the
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								[_Forms_](guide/forms) guide shows how to bind to them.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								各种元素都有很多特有的处理细节，因此 `NgModel` 指令只支持实现了[ControlValueAccessor](api/forms/ControlValueAccessor)的元素，
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								它们能让元素适配本协议。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`<input>` 输入框正是其中之一。
 								Angular 为所有的基础 HTML 表单都提供了*值访问器（Value accessor）*，[*表单*](guide/forms)一章展示了如何绑定它们。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								You can't apply `[(ngModel)]` to a non-form native element or a third-party custom component
 								until you write a suitable *value accessor*,
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								a technique that is beyond the scope of this guide.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								我们不能把 `[(ngModel)]` 用到非表单类的原生元素或第三方自定义组件上，除非写一个合适的*值访问器*，这种技巧超出了本章的范围。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								You don't need a _value accessor_ for an Angular component that you write because you
 								can name the value and event properties
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								to suit Angular's basic [two-way binding syntax](guide/template-syntax#two-way) and skip `NgModel` altogether.
 								The [`sizer` shown above](guide/template-syntax#two-way) is an example of this technique.
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								我们自己写的 Angular 组件不需要*值访问器*，因为我们可以让值和事件的属性名适应 Angular 基本的[双向绑定语法](guide/template-syntax#two-way)，而不使用 `NgModel`。
 								[前面看过的 `sizer`](guide/template-syntax#two-way)就是使用这种技巧的例子。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Separate `ngModel` bindings is an improvement over binding to the element's native properties. You can do better.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								使用独立的 `ngModel` 绑定优于绑定到该元素的原生属性，那样我们可以做得更好。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								You shouldn't have to mention the data property twice. Angular should be able to capture
 								the component's data property and set it
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								with a single declaration, which it can with the `[(ngModel)]` syntax:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								我们不用被迫两次引用这个数据属性，Angular 可以捕获该元素的数据属性，并且通过一个简单的声明来设置它，这样它就可以使用 `[(ngModel)]` 语法了。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgModel-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Is `[(ngModel)]` all you need? Is there ever a reason to fall back to its expanded form?
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`[(ngModel)]` 就是你需要的一切吗？有没有什么理由回退到它的展开形式？
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The `[(ngModel)]` syntax can only _set_ a data-bound property.
 								If you need to do something more or something different, you can write the expanded form.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`[(ngModel)]` 语法只能*设置*数据绑定属性。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								如果要做更多或者做点不一样的事，也可以写它的展开形式。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The following contrived example forces the input value to uppercase:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								下面这个生造的例子强制输入框的内容变成大写：
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgModel-4" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Here are all variations in action, including the uppercase version:
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												fix: add line break before all figure

											
										
										
											2017-08-03 21:27:48 -04:00
+								这里是所有这些变体的动画，包括这个大写转换的版本：
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								<figure>
-												docs(aio): image sweep (#16609)

* fix(aio): allow code blocks to clear floated images

Previously the negative margin on the code headings were causing
floated images to overlay the start of a code block. Now all code block
successfully clear all floated elements.

* feat(aio): add a `.clear` class for clearing floating images

* fix(aio): tidy up image styles

The css rules for `img.right` and `img.left` allow authors easy
access to floating an image on the left or right, respectively.

The `.image-display` rule which was always found on a figure
has been simplified so that all figures have this styling. It is very
unlikely that a figure will be used outside the content area; and
at this time it seems like `figure` is as good an indicator that we
want this kind of styling as anything.

Now that images are all tagged with width and height values, we cannot
assume to modify these dimensions via CSS as it can cause the image to
lose its correct proportions.  Until we find a better solition we must set
`height` to `auto` when the screen width is below 1300px to ensure that
these images maintain their proportions as they get shrunk to fit.

* docs(aio): general tidy up of image HTML in guides

Previously, the guides have a lot of inline image styling and unnecessary
use of the `image-display` css class.
Images over 700px are problematic for guide docs, so those have been given
specific widths and associated heights.

* docs(aio): use correct anchor for "back to the top" link

The `#toc` anchor does not work when the page is
wide enough that the TOC is floating to the side.

* build(aio): add `#top-of-page` to path variants for link checking

Since the `#top-of-page` is outside the rendered docs
the `checkAnchorLinks` processor doesn't find them
as valid targets for links.
Adding them as a `pathVariant` solves this problem
but will still catch links to docs that do not actually exist.

* fix(aio): ensure that headings clear floated images

* fix(aio): do not force live-example embedded image to 100% size

This made them look too big, generally. Leaving them with no size means
that they will look reasonable in large viewports and switch to 100% width
in narrow viewports.

											
										
										
											2017-05-09 18:53:32 -04:00
+								  <img src='generated/images/guide/template-syntax/ng-model-anim.gif' alt="NgModel variations">
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								</figure>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a structural-directives}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## Built-in _structural_ directives
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 内置*结构型*指令
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Structural directives are responsible for HTML layout.
 								They shape or reshape the DOM's _structure_, typically by adding, removing, and manipulating
 								the host elements to which they are attached.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								结构型指令的职责是 HTML 布局。
 								它们塑造或重塑 DOM 的*结构*，这通常是通过添加、移除和操纵它们所附加到的宿主元素来实现的。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The deep details of structural directives are covered in the
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								[_Structural Directives_](guide/structural-directives) guide
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								where you'll learn:
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								关于结构型指令的详情参见[*结构型指令*](guide/structural-directives)一章，在那里我们将学到：
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								* why you
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								[_prefix the directive name with an asterisk_ (\*)](guide/structural-directives#asterisk "The * in *ngIf").
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   为什么要[给结构型指令的名字加上(\*)前缀？](guide/structural-directives#asterisk "The * in *ngIf")
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								* to use [`<ng-container>`](guide/structural-directives#ngcontainer "<ng-container>")
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								to group elements when there is no suitable host element for the directive.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: merge PRs

											
										
										
											2018-03-09 02:30:16 -05:00
+								   当没有合适的宿主元素放置指令时，可用 [`<ng-container>`](guide/structural-directives#ngcontainer "<ng-container>") 对元素进行分组。
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								* how to write your own structural directive.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   如何写自己的结构型指令。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								* that you can only apply [one structural directive](guide/structural-directives#one-per-element "one per host element") to an element.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   我们只能往一个元素上应用[一个结构型指令](guide/structural-directives#one-per-element "one per host element")。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								_This_ section is an introduction to the common structural directives:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								*本节*是对常见结构型指令的简介：
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								* [`NgIf`](guide/template-syntax#ngIf) - conditionally add or remove an element from the DOM
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   [`NgIf`](guide/template-syntax#ngIf) - 根据条件把一个元素添加到 DOM 中或从 DOM 移除
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								* [`NgSwitch`](guide/template-syntax#ngSwitch) - a set of directives that switch among alternative views
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   [`NgSwitch`](guide/template-syntax#ngSwitch) 一组指令，用来在多个可选视图之间切换。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												Merge branch 'master' into aio

# Conflicts:
#	aio/content/guide/ajs-quick-reference.md
#	aio/content/guide/animations.md
#	aio/content/guide/browser-support.md
#	aio/content/guide/form-validation.md
#	aio/content/guide/i18n.md
#	aio/content/guide/pipes.md
#	aio/content/guide/router.md
#	aio/content/guide/set-document-title.md
#	aio/content/guide/structural-directives.md
#	aio/content/guide/template-syntax.md
#	aio/content/guide/testing.md
#	aio/content/marketing/resources.json
#	aio/content/tutorial/toh-pt1.md
#	aio/content/tutorial/toh-pt2.md
#	aio/content/tutorial/toh-pt3.md
#	aio/content/tutorial/toh-pt4.md
#	aio/content/tutorial/toh-pt5.md

											
										
										
											2017-09-30 23:40:31 -04:00
+								* [NgForOf](guide/template-syntax#ngFor) - repeat a template for each item in a list
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								   [NgForOf](guide/template-syntax#ngFor) - 对列表中的每个条目重复套用同一个模板
-												docs(aio): ensure blank lines before HTML blocks in markdown

											
										
										
											2017-03-30 15:04:18 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a ngIf}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								### NgIf
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You can add or remove an element from the DOM by applying an `NgIf` directive to
-												docs(aio): Update `NgStyle` and `NgClass` to use quoted keys

											
										
										
											2017-07-06 12:43:21 -04:00
+								that element (called the _host element_).
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Bind the directive to a condition expression like `isActive` in this example.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								通过把 `NgIf` 指令应用到元素上（称为*宿主元素*），我们可以往 DOM 中添加或从 DOM 中移除这个元素。
 								在下面的例子中，该指令绑定到了类似于 `isActive` 这样的条件表达式。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgIf-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="alert is-critical">
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Don't forget the asterisk (`*`) in front of `ngIf`.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								别忘了 `ngIf` 前面的星号(`*`)。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								When the `isActive` expression returns a truthy value, `NgIf` adds the `HeroDetailComponent` to the DOM.
 								When the expression is falsy, `NgIf` removes the `HeroDetailComponent`
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								from the DOM, destroying that component and all of its sub-components.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								当 `isActive` 表达式返回真值时，`NgIf` 把 `HeroDetailComponent` 添加到 DOM 中；为假时，`NgIf` 会从 DOM 中移除 `HeroDetailComponent`，并销毁该组件及其所有子组件。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								#### Show/hide is not the same thing
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								#### 这和显示/隐藏不是一回事
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You can control the visibility of an element with a
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								[class](guide/template-syntax#class-binding) or [style](guide/template-syntax#style-binding) binding:
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								我们也可以通过[类绑定](guide/template-syntax#class-binding)或[样式绑定](guide/template-syntax#style-binding)来显示或隐藏一个元素。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgIf-3" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Hiding an element is quite different from removing an element with `NgIf`.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								但隐藏子树和用 `NgIf` 排除子树是截然不同的。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								When you hide an element, that element and all of its descendents remain in the DOM.
 								All components for those elements stay in memory and
 								Angular may continue to check for changes.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								You could be holding onto considerable computing resources and degrading performance,
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								for something the user can't see.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								当隐藏子树时，它仍然留在 DOM 中。
 								子树中的组件及其状态仍然保留着。
 								即使对于不可见属性，Angular 也会继续检查变更。
 								子树可能占用相当可观的内存和运算资源。
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								When `NgIf` is `false`, Angular removes the element and its descendents from the DOM.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								It destroys their components, potentially freeing up substantial resources,
 								resulting in a more responsive user experience.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								当 `NgIf` 为 `false` 时，Angular 从 DOM 中物理地移除了这个元素子树。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								它销毁了子树中的组件及其状态，也潜在释放了可观的资源，最终让用户体验到更好的性能。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								The show/hide technique is fine for a few elements with few children.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								You should be wary when hiding large component trees; `NgIf` may be the safer choice.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								显示/隐藏的技术对于只有少量子元素的元素是很好用的，但要当心别试图隐藏大型组件树。相比之下，`NgIf` 则是个更安全的选择。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								#### Guard against null
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								#### 防范空指针错误
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The `ngIf` directive is often used to guard against null.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Show/hide is useless as a guard.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Angular will throw an error if a nested expression tries to access a property of `null`.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`ngIf` 指令通常会用来防范空指针错误。
 								而显示/隐藏的方式是无法防范的，当一个表达式尝试访问空值的属性时，Angular 就会抛出一个异常。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Here we see `NgIf` guarding two `<div>`s.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The `currentHero` name will appear only when there is a `currentHero`.
 								The `nullHero` will never be displayed.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								这里我们用 `NgIf` 来保护了两个 `<div>` 防范空指针错误。
 								`currentHero` 的名字只有当存在 `currentHero` 时才会显示出来。
 								而 `nullHero` 永远不会显示。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgIf-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								See also the
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								[_safe navigation operator_](guide/template-syntax#safe-navigation-operator "Safe navigation operator (?.)")
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								described below.
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								参见稍后的[_安全导航操作符_](guide/template-syntax#safe-navigation-operator "Safe naviation operator (?.)")部分。
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								{@a ngFor}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												refactor(common): remove deprecated `NgFor` (#18758)

BREAKING CHANGE: `NgFor` has been removed as it was deprecated since v4. Use `NgForOf` instead. This does not impact the use of`*ngFor` in your templates.

PR Close #18758

											
										
										
											2017-08-17 05:40:46 -04:00
+								### NgForOf
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												refactor(common): remove deprecated `NgFor` (#18758)

BREAKING CHANGE: `NgFor` has been removed as it was deprecated since v4. Use `NgForOf` instead. This does not impact the use of`*ngFor` in your templates.

PR Close #18758

											
										
										
											2017-08-17 05:40:46 -04:00
+								`NgForOf` is a _repeater_ directive &mdash; a way to present a list of items.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You define a block of HTML that defines how a single item should be displayed.
 								You tell Angular to use that block as a template for rendering each item in the list.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`NgFor` 是一个_重复器_指令 —— 自定义数据显示的一种方式。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								我们的目标是展示一个由多个条目组成的列表。首先定义了一个 HTML 块，它规定了单个条目应该如何显示。
 								再告诉 Angular 把这个块当做模板，渲染列表中的每个条目。
-												refactor(common): remove deprecated `NgFor` (#18758)

BREAKING CHANGE: `NgFor` has been removed as it was deprecated since v4. Use `NgForOf` instead. This does not impact the use of`*ngFor` in your templates.

PR Close #18758

											
										
										
											2017-08-17 05:40:46 -04:00
+								Here is an example of `NgForOf` applied to a simple `<div>`:
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								下例中，`NgFor` 应用在一个简单的 `<div>` 上：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgFor-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												refactor(common): remove deprecated `NgFor` (#18758)

BREAKING CHANGE: `NgFor` has been removed as it was deprecated since v4. Use `NgForOf` instead. This does not impact the use of`*ngFor` in your templates.

PR Close #18758

											
										
										
											2017-08-17 05:40:46 -04:00
+								You can also apply an `NgForOf` to a component element, as in this example:
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								也可以把 `NgFor` 应用在一个组件元素上，就下例这样：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgFor-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="alert is-critical">
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								Don't forget the asterisk (`*`) in front of `ngFor`.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								不要忘了 `ngFor` 前面的星号 (`*`)。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								The text assigned to `*ngFor` is the instruction that guides the repeater process.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								赋值给 `*ngFor` 的文本是用于指导重复器如何工作的指令。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								{@a microsyntax}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								#### *ngFor microsyntax
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								#### NgFor 微语法
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								The string assigned to `*ngFor` is not a [template expression](guide/template-syntax#template-expressions).
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								It's a *microsyntax* &mdash; a little language of its own that Angular interprets.
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								The string `"let hero of heroes"` means:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								赋值给 `*ngFor` 的字符串不是[模板表达式](guide/template-syntax#template-expressions)。
 								它是一个*微语法* —— 由 Angular 自己解释的小型语言。在这个例子中，字符串 `"let hero of heroes"` 的含义是：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								> *Take each hero in the `heroes` array, store it in the local `hero` looping variable, and
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								make it available to the templated HTML for each iteration.*
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								> *取出 `heroes` 数组中的每个英雄，把它存入局部变量 `hero` 中，并在每次迭代时对模板 HTML 可用*
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): final migration from old site

											
										
										
											2017-04-12 15:53:18 -04:00
+								Angular translates this instruction into a `<ng-template>` around the host element,
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								then uses this template repeatedly to create a new set of elements and bindings for each `hero`
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								in the list.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								Angular 把这个指令翻译成了一个 `<ng-template>` 包裹的宿主元素，然后使用这个模板重复创建出一组新元素，并且绑定到列表中的每一个 `hero`。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								Learn about the _microsyntax_ in the [_Structural Directives_](guide/structural-directives#microsyntax) guide.
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
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+								要了解*微语法*的更多知识，参见[_结构型指令_](guide/structural-directives#microsyntax)一章。
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+								{@a template-input-variable}
 								{@a template-input-variables}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

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+								### Template input variables
-												docs(aio): merge latest chinese translations

											
										
										
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+								### 模板输入变量
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											2017-02-22 13:09:39 -05:00
+								The `let` keyword before `hero` creates a _template input variable_ called `hero`.
-												refactor(common): remove deprecated `NgFor` (#18758)

BREAKING CHANGE: `NgFor` has been removed as it was deprecated since v4. Use `NgForOf` instead. This does not impact the use of`*ngFor` in your templates.

PR Close #18758

											
										
										
											2017-08-17 05:40:46 -04:00
+								The `NgForOf` directive iterates over the `heroes` array returned by the parent component's `heroes` property
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								and sets `hero` to the current item from the array during each iteration.
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-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`hero` 前的 `let` 关键字创建了一个名叫 `hero` 的*模板输入变量*。
 								`ngFor` 指令在由父组件的 `heroes` 属性返回的 `heroes` 数组上迭代，每次迭代都从数组中把当前元素赋值给 `hero` 变量。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												refactor(common): remove deprecated `NgFor` (#18758)

BREAKING CHANGE: `NgFor` has been removed as it was deprecated since v4. Use `NgForOf` instead. This does not impact the use of`*ngFor` in your templates.

PR Close #18758

											
										
										
											2017-08-17 05:40:46 -04:00
+								You reference the `hero` input variable within the `NgForOf` host element
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								(and within its descendants) to access the hero's properties.
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											2017-02-22 13:09:39 -05:00
+								Here it is referenced first in an interpolation
 								and then passed in a binding to the `hero` property of the `<hero-detail>` component.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								我们可以在 `ngFor` 的宿主元素（及其子元素）中引用模板输入变量 `hero`，从而访问该英雄的属性。
 								这里它首先在一个插值表达式中被引用到，然后通过一个绑定把它传给了 `<hero-detail>` 组件的 `hero` 属性。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
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+								<code-example path="template-syntax/src/app/app.component.html" region="NgFor-1-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
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-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								Learn more about _template input variables_ in the
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								[_Structural Directives_](guide/structural-directives#template-input-variable) guide.
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-												docs(aio): merge latest chinese translations

											
										
										
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+								要了解更多*模板输入变量*的知识，参见[*结构型指令*](guide/structural-directives#template-input-variable)一章。
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											2017-02-22 13:09:39 -05:00
+								#### *ngFor with _index_
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
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+								#### 带索引的 `*ngFor`
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												refactor(common): remove deprecated `NgFor` (#18758)

BREAKING CHANGE: `NgFor` has been removed as it was deprecated since v4. Use `NgForOf` instead. This does not impact the use of`*ngFor` in your templates.

PR Close #18758

											
										
										
											2017-08-17 05:40:46 -04:00
+								The `index` property of the `NgForOf` directive context returns the zero-based index of the item in each iteration.
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											2017-02-22 13:09:39 -05:00
+								You can capture the `index` in a template input variable and use it in the template.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`NgFor` 指令上下文中的 `index` 属性返回一个从零开始的索引，表示当前条目在迭代中的顺序。
 								我们可以通过模板输入变量捕获这个 `index` 值，并把它用在模板中。
-												docs(aio): merge latest chinese translations

											
										
										
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-												docs(aio): migrate content docs from angular.io

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+								The next example captures the `index` in a variable named `i` and displays it with the hero name like this.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								下面这个例子把 `index` 捕获到了 `i` 变量中，并且把它显示在英雄名字的前面。
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-												build(aio): new migration

											
										
										
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+								<code-example path="template-syntax/src/app/app.component.html" region="NgFor-3" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
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+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): migrate content docs from angular.io

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-												docs(aio): add copy about NgForOf (#18686)


											
										
										
											2017-09-27 18:25:41 -04:00
+								`NgFor` is implemented by the `NgForOf` directive. Read more about the other `NgForOf` context values such as `last`, `even`,
-												refactor(common): remove deprecated `NgFor` (#18758)

BREAKING CHANGE: `NgFor` has been removed as it was deprecated since v4. Use `NgForOf` instead. This does not impact the use of`*ngFor` in your templates.

PR Close #18758

											
										
										
											2017-08-17 05:40:46 -04:00
+								and `odd` in the [NgForOf API reference](api/common/NgForOf).
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											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								要学习更多的*类似 index* 的值，例如 `last`、`even` 和 `odd`，请参阅 [NgFor API 参考](api/common/NgForOf)。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): migrate content docs from angular.io

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+								{@a trackBy}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								#### *ngFor with _trackBy_
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								#### 带 `trackBy` 的 `*ngFor`
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												refactor(common): remove deprecated `NgFor` (#18758)

BREAKING CHANGE: `NgFor` has been removed as it was deprecated since v4. Use `NgForOf` instead. This does not impact the use of`*ngFor` in your templates.

PR Close #18758

											
										
										
											2017-08-17 05:40:46 -04:00
+								The `NgForOf` directive may perform poorly, especially with large lists.
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								A small change to one item, an item removed, or an item added can trigger a cascade of DOM manipulations.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`ngFor` 指令有时候会性能较差，特别是在大型列表中。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								对一个条目的一丁点改动、移除或添加，都会导致级联的 DOM 操作。
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											2017-02-22 13:09:39 -05:00
+								For example, re-querying the server could reset the list with all new hero objects.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								例如，我们可以通过重新从服务器查询来刷新英雄列表。
 								  刷新后的列表可能包含很多（如果不是全部的话）以前显示过的英雄。
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											2017-02-22 13:09:39 -05:00
+								Most, if not all, are previously displayed heroes.
 								*You* know this because the `id` of each hero hasn't changed.
 								But Angular sees only a fresh list of new object references.
 								It has no choice but to tear down the old DOM elements and insert all new DOM elements.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								他们中的绝大多数（如果不是所有的话）都是以前显示过的英雄。*我们*知道这一点，是因为每个英雄的 `id` 没有变化。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								  但在 Angular 看来，它只是一个由新的对象引用构成的新列表，
 								  它没有选择，只能清理旧列表、舍弃那些 DOM 元素，并且用新的 DOM 元素来重建一个新列表。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								Angular can avoid this churn with `trackBy`.
-												refactor(common): remove deprecated `NgFor` (#18758)

BREAKING CHANGE: `NgFor` has been removed as it was deprecated since v4. Use `NgForOf` instead. This does not impact the use of`*ngFor` in your templates.

PR Close #18758

											
										
										
											2017-08-17 05:40:46 -04:00
+								Add a method to the component that returns the value `NgForOf` _should_ track.
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								In this case, that value is the hero's `id`.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								如果给它指定一个 `trackBy`，Angular 就可以避免这种折腾。
 								  我们往组件中添加一个方法，它会返回 `NgFor`*应该*追踪的值。
 								  在这里，这个值就是英雄的 `id`。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.ts" region="trackByHeroes" title="src/app/app.component.ts" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								In the microsyntax expression, set `trackBy` to this method.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								在微语法中，把 `trackBy` 设置为该方法。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="trackBy" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
 								Here is an illustration of the _trackBy_ effect.
 								"Reset heroes" creates new heroes with the same `hero.id`s.
 								"Change ids" creates new heroes with new `hero.id`s.
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								这里展示了 `trackBy` 的效果。
 								"Reset heroes"会创建一个具有相同 `hero.id` 的新英雄。
 								"Change ids"则会创建一个具有新 `hero.id` 的新英雄。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								* With no `trackBy`, both buttons trigger complete DOM element replacement.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   如果没有 `trackBy`，这些按钮都会触发完全的 DOM 元素替换。
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								* With `trackBy`, only changing the `id` triggers element replacement.
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   有了 `trackBy`，则只有修改了 `id` 的按钮才会触发元素替换。
-												docs(aio): ensure blank lines before HTML blocks in markdown

											
										
										
											2017-03-30 15:04:18 -04:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								<figure>
-												docs(aio): image sweep (#16609)

* fix(aio): allow code blocks to clear floated images

Previously the negative margin on the code headings were causing
floated images to overlay the start of a code block. Now all code block
successfully clear all floated elements.

* feat(aio): add a `.clear` class for clearing floating images

* fix(aio): tidy up image styles

The css rules for `img.right` and `img.left` allow authors easy
access to floating an image on the left or right, respectively.

The `.image-display` rule which was always found on a figure
has been simplified so that all figures have this styling. It is very
unlikely that a figure will be used outside the content area; and
at this time it seems like `figure` is as good an indicator that we
want this kind of styling as anything.

Now that images are all tagged with width and height values, we cannot
assume to modify these dimensions via CSS as it can cause the image to
lose its correct proportions.  Until we find a better solition we must set
`height` to `auto` when the screen width is below 1300px to ensure that
these images maintain their proportions as they get shrunk to fit.

* docs(aio): general tidy up of image HTML in guides

Previously, the guides have a lot of inline image styling and unnecessary
use of the `image-display` css class.
Images over 700px are problematic for guide docs, so those have been given
specific widths and associated heights.

* docs(aio): use correct anchor for "back to the top" link

The `#toc` anchor does not work when the page is
wide enough that the TOC is floating to the side.

* build(aio): add `#top-of-page` to path variants for link checking

Since the `#top-of-page` is outside the rendered docs
the `checkAnchorLinks` processor doesn't find them
as valid targets for links.
Adding them as a `pathVariant` solves this problem
but will still catch links to docs that do not actually exist.

* fix(aio): ensure that headings clear floated images

* fix(aio): do not force live-example embedded image to 100% size

This made them look too big, generally. Leaving them with no size means
that they will look reasonable in large viewports and switch to 100% width
in narrow viewports.

											
										
										
											2017-05-09 18:53:32 -04:00
+								  <img src="generated/images/guide/template-syntax/ng-for-track-by-anim.gif" alt="trackBy">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								</figure>
-												docs(aio): ensure blank lines before HTML blocks in markdown

											
										
										
											2017-03-30 15:04:18 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a ngSwitch}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								### The _NgSwitch_ directives
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								### `NgSwitch` 指令
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								*NgSwitch* is like the JavaScript `switch` statement.
 								It can display _one_ element from among several possible elements, based on a _switch condition_.
 								Angular puts only the *selected* element into the DOM.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`NgSwitch` 指令类似于 JavaScript 的 `switch` 语句。
 								它可以从多个可能的元素中根据*switch 条件*来显示某一个。
 								Angular 只会把*选中的*元素放进 DOM 中。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								*NgSwitch* is actually a set of three, cooperating directives:
 								`NgSwitch`, `NgSwitchCase`, and `NgSwitchDefault` as seen in this example.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`NgSwitch` 实际上包括三个相互协作的指令：`NgSwitch`、`NgSwitchCase` 和 `NgSwitchDefault`，例子如下：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgSwitch" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): image sweep (#16609)

* fix(aio): allow code blocks to clear floated images

Previously the negative margin on the code headings were causing
floated images to overlay the start of a code block. Now all code block
successfully clear all floated elements.

* feat(aio): add a `.clear` class for clearing floating images

* fix(aio): tidy up image styles

The css rules for `img.right` and `img.left` allow authors easy
access to floating an image on the left or right, respectively.

The `.image-display` rule which was always found on a figure
has been simplified so that all figures have this styling. It is very
unlikely that a figure will be used outside the content area; and
at this time it seems like `figure` is as good an indicator that we
want this kind of styling as anything.

Now that images are all tagged with width and height values, we cannot
assume to modify these dimensions via CSS as it can cause the image to
lose its correct proportions.  Until we find a better solition we must set
`height` to `auto` when the screen width is below 1300px to ensure that
these images maintain their proportions as they get shrunk to fit.

* docs(aio): general tidy up of image HTML in guides

Previously, the guides have a lot of inline image styling and unnecessary
use of the `image-display` css class.
Images over 700px are problematic for guide docs, so those have been given
specific widths and associated heights.

* docs(aio): use correct anchor for "back to the top" link

The `#toc` anchor does not work when the page is
wide enough that the TOC is floating to the side.

* build(aio): add `#top-of-page` to path variants for link checking

Since the `#top-of-page` is outside the rendered docs
the `checkAnchorLinks` processor doesn't find them
as valid targets for links.
Adding them as a `pathVariant` solves this problem
but will still catch links to docs that do not actually exist.

* fix(aio): ensure that headings clear floated images

* fix(aio): do not force live-example embedded image to 100% size

This made them look too big, generally. Leaving them with no size means
that they will look reasonable in large viewports and switch to 100% width
in narrow viewports.

											
										
										
											2017-05-09 18:53:32 -04:00
+								<figure>
 								  <img src="generated/images/guide/template-syntax/switch-anim.gif" alt="trackBy">
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								</figure>
 								`NgSwitch` is the controller directive. Bind it to an expression that returns the *switch value*.
 								The `emotion` value in this example is a string, but the switch value can be of any type.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`NgSwitch` 是主控指令，要把它绑定到一个返回*候选值*的表达式。
 								本例子中的 `emotion` 是个字符串，但实际上这个候选值可以是任意类型。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								**Bind to `[ngSwitch]`**. You'll get an error if you try to set `*ngSwitch` because
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								`NgSwitch` is an *attribute* directive, not a *structural* directive.
 								It changes the behavior of its companion directives.
 								It doesn't touch the DOM directly.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								**绑定到 `[ngSwitch]`**。如果试图用 `*ngSwitch` 的形式使用它就会报错，这是因为 `NgSwitch` 是一个*属性型*指令，而不是*结构型指令*。
 								它要修改的是所在元素的行为，而不会直接接触 DOM 结构。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								**Bind to `*ngSwitchCase` and `*ngSwitchDefault`**.
 								The `NgSwitchCase` and `NgSwitchDefault` directives are _structural_ directives
 								because they add or remove elements from the DOM.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								**绑定到 `*ngSwitchCase` 和 `*ngSwitchDefault`**
 								`NgSwitchCase` 和 `NgSwitchDefault` 指令都是*结构型指令*，因为它们会从 DOM 中添加或移除元素。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								* `NgSwitchCase` adds its element to the DOM when its bound value equals the switch value.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   `NgSwitchCase` 会在它绑定到的值等于候选值时，把它所在的元素加入到 DOM 中。
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								* `NgSwitchDefault` adds its element to the DOM when there is no selected `NgSwitchCase`.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								   `NgSwitchDefault` 会在没有任何一个 `NgSwitchCase` 被选中时把它所在的元素加入 DOM 中。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The switch directives are particularly useful for adding and removing *component elements*.
 								This example switches among four "emotional hero" components defined in the `hero-switch.components.ts` file.
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								Each component has a `hero` [input property](guide/template-syntax#inputs-outputs "Input property")
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								which is bound to the `currentHero` of the parent component.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								这组指令在要添加或移除*组件元素*时会非常有用。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								这个例子会在 `hero-switch.components.ts` 中定义的四个“感人英雄”组件之间选择。
 								每个组件都有一个[输入属性](guide/template-syntax#inputs-outputs "Input property")`hero`，它绑定到父组件的 `currentHero` 上。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Switch directives work as well with native elements and web components too.
 								For example, you could replace the `<confused-hero>` switch case with the following.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								这组指令在原生元素和<a href="https://developer.mozilla.org/en-US/docs/Web/Web_Components" target="_blank" title="MDN: Web Components">Web Component</a>上都可以正常工作。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								比如，你可以把 `<confused-hero>` 分支改成这样：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="NgSwitch-div" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a template-reference-variable}
 								{@a ref-vars}
 								{@a ref-var}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## Template reference variables ( <span class="syntax">#var</span> )
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 模板引用变量 ( <span class="syntax">#var</span> )
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								A **template reference variable** is often a reference to a DOM element within a template.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								It can also be a reference to an Angular component or directive or a
-												docs(aio): remove _blank target (#16205)


											
										
										
											2017-04-24 14:23:45 -04:00
+								<a href="https://developer.mozilla.org/en-US/docs/Web/Web_Components" title="MDN: Web Components">web component</a>.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								**模板引用变量**通常用来引用模板中的某个 DOM 元素，它还可以引用 Angular 组件或指令或<a href="https://developer.mozilla.org/en-US/docs/Web/Web_Components" target="_blank" title="MDN: Web Components">Web Component</a>。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Use the hash symbol (#) to declare a reference variable.
 								The `#phone` declares a `phone` variable on an `<input>` element.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								使用井号 (#) 来声明引用变量。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`#phone` 的意思就是声明一个名叫 `phone` 的变量来引用 `<input>` 元素。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="ref-var" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								You can refer to a template reference variable _anywhere_ in the template.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The `phone` variable declared on this `<input>` is
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								consumed in a `<button>` on the other side of the template
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								我们可以在模板中的任何地方引用模板引用变量。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								比如声明在 `<input>` 上的 `phone` 变量就是在模板另一侧的 `<button>` 上使用的。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="ref-phone" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): doc guide tweaks (GS thru Components)

Working through obvious non-image content defects, from top of menu (Getting Started) through Fundamentals/Components.

											
										
										
											2017-05-08 23:47:34 -04:00
+								<h3 class="no-toc">How a reference variable gets its value</h3>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								<h3 class="no-toc">模板引用变量怎么得到它的值？</h3>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								In most cases, Angular sets the reference variable's value to the element on which it was declared.
 								In the previous example, `phone` refers to the _phone number_ `<input>` box.
 								The phone button click handler passes the _input_ value to the component's `callPhone` method.
 								But a directive can change that behavior and set the value to something else, such as itself.
 								The `NgForm` directive does that.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								大多数情况下，Angular 会把模板引用变量的值设置为声明它的那个元素。
 								在上一个例子中，`phone` 引用的是表示*电话号码*的 `<input>` 框。
 								"拨号"按钮的点击事件处理器把这个*input*值传给了组件的 `callPhone` 方法。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								不过，指令也可以修改这种行为，让这个值引用到别处，比如它自身。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`NgForm` 指令就是这么做的。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								The following is a *simplified* version of the form example in the [Forms](guide/forms) guide.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								下面是[表单](guide/forms)一章中表单范例的*简化版*。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/hero-form.component.html" title="src/app/hero-form.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								A template reference variable, `heroForm`, appears three times in this example, separated
 								by a large amount of HTML.
 								What is the value of `heroForm`?
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								模板引用变量 `heroForm` 在这个例子中出现了三次，中间隔着一大堆 HTML。
 								`heroForm` 的值是什么？
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								If Angular hadn't taken it over when you imported the `FormsModule`,
 								it would be the [HTMLFormElement](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement).
-												docs(aio): fix lots of broken links

Closes #16317

											
										
										
											2017-04-30 16:10:32 -04:00
+								The `heroForm` is actually a reference to an Angular [NgForm](api/forms/NgForm "API: NgForm")
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								directive with the ability to track the value and validity of every control in the form.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								如果你没有导入过 `FormsModule`，Angular 就不会控制这个表单，那么它就是一个[HTMLFormElement](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement)实例。
 								这里的 `heroForm` 实际上是一个 Angular [NgForm](api/forms/NgForm "API: NgForm") 指令的引用，
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								因此具备了跟踪表单中的每个控件的值和有效性的能力。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The native `<form>` element doesn't have a `form` property.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								But the `NgForm` directive does, which explains how you can disable the submit button
 								if the `heroForm.form.valid` is invalid and pass the entire form control tree
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								to the parent component's `onSubmit` method.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								原生的 `<form>` 元素没有 `form` 属性，但 `NgForm` 指令有。这就解释了为何当 `heroForm.form.valid` 是无效时我们可以禁用提交按钮，
 								并能把整个表单控件树传给父组件的 `onSubmit` 方法。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): doc guide tweaks (GS thru Components)

Working through obvious non-image content defects, from top of menu (Getting Started) through Fundamentals/Components.

											
										
										
											2017-05-08 23:47:34 -04:00
+								<h3 class="no-toc">Template reference variable warning notes</h3>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								<h3 class="no-toc">关于模板引用变量的注意事项</h3>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								A template _reference_ variable (`#phone`) is _not_ the same as a template _input_ variable (`let phone`)
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								such as you might see in an [`*ngFor`](guide/template-syntax#template-input-variable).
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								Learn the difference in the [_Structural Directives_](guide/structural-directives#template-input-variable) guide.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								模板*引用*变量 (`#phone`) 和[`*ngFor`](guide/template-syntax#template-input-variable)部分看到过的模板*输入*变量 (`let phone`) 是不同的。
 								要了解详情，参见[结构型指令](guide/structural-directives#template-input-variable)一章。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The scope of a reference variable is the _entire template_.
 								Do not define the same variable name more than once in the same template.
 								The runtime value will be unpredictable.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								模板引用变量的作用范围是*整个模板*。
 								不要在同一个模板中多次定义同一个变量名，否则它在运行期间的值是无法确定的。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You can use the `ref-` prefix alternative to `#`.
 								This example declares the `fax` variable as `ref-fax` instead of `#fax`.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								我们也可以用 `ref-` 前缀代替 `#`。
 								下面的例子中就用把 `fax` 变量声明成了 `ref-fax` 而不是 `#fax`。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="ref-fax" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a inputs-outputs}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								## Input and Output properties
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												Merge remote-tracking branch 'en/master' into aio

# Conflicts:
#	aio/content/guide/ajs-quick-reference.md
#	aio/content/guide/animations.md
#	aio/content/guide/aot-compiler.md
#	aio/content/guide/attribute-directives.md
#	aio/content/guide/bootstrapping.md
#	aio/content/guide/browser-support.md
#	aio/content/guide/component-interaction.md
#	aio/content/guide/component-styles.md
#	aio/content/guide/dependency-injection-in-action.md
#	aio/content/guide/dependency-injection.md
#	aio/content/guide/deployment.md
#	aio/content/guide/displaying-data.md
#	aio/content/guide/form-validation.md
#	aio/content/guide/forms.md
#	aio/content/guide/glossary.md
#	aio/content/guide/http.md
#	aio/content/guide/i18n.md
#	aio/content/guide/ngmodule-faq.md
#	aio/content/guide/ngmodule.md
#	aio/content/guide/npm-packages.md
#	aio/content/guide/pipes.md
#	aio/content/guide/quickstart.md
#	aio/content/guide/reactive-forms.md
#	aio/content/guide/structural-directives.md
#	aio/content/guide/template-syntax.md
#	aio/content/guide/testing.md
#	aio/content/marketing/index.html
#	aio/content/navigation.json
#	aio/content/tutorial/index.md
#	aio/content/tutorial/toh-pt1.md
#	aio/content/tutorial/toh-pt2.md
#	aio/content/tutorial/toh-pt3.md
#	aio/content/tutorial/toh-pt4.md
#	aio/content/tutorial/toh-pt5.md
#	aio/content/tutorial/toh-pt6.md
#	aio/src/app/embedded/api/api-list.component.ts
#	aio/src/app/layout/doc-viewer/doc-viewer.component.ts
#	aio/src/app/layout/footer/footer.component.html
#	aio/src/app/layout/toc/toc.component.html
#	aio/src/app/search/search.service.ts
#	aio/src/styles/1-layouts/_marketing-layout.scss
#	aio/yarn.lock

											
										
										
											2018-02-27 19:08:59 -05:00
+								## 输入和输出属性
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								An _Input_ property is a _settable_ property annotated with an `@Input` decorator.
 								Values flow _into_ the property when it is data bound with a [property binding](#property-binding)
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												Merge remote-tracking branch 'en/master' into aio

# Conflicts:
#	aio/content/guide/ajs-quick-reference.md
#	aio/content/guide/animations.md
#	aio/content/guide/aot-compiler.md
#	aio/content/guide/attribute-directives.md
#	aio/content/guide/bootstrapping.md
#	aio/content/guide/browser-support.md
#	aio/content/guide/component-interaction.md
#	aio/content/guide/component-styles.md
#	aio/content/guide/dependency-injection-in-action.md
#	aio/content/guide/dependency-injection.md
#	aio/content/guide/deployment.md
#	aio/content/guide/displaying-data.md
#	aio/content/guide/form-validation.md
#	aio/content/guide/forms.md
#	aio/content/guide/glossary.md
#	aio/content/guide/http.md
#	aio/content/guide/i18n.md
#	aio/content/guide/ngmodule-faq.md
#	aio/content/guide/ngmodule.md
#	aio/content/guide/npm-packages.md
#	aio/content/guide/pipes.md
#	aio/content/guide/quickstart.md
#	aio/content/guide/reactive-forms.md
#	aio/content/guide/structural-directives.md
#	aio/content/guide/template-syntax.md
#	aio/content/guide/testing.md
#	aio/content/marketing/index.html
#	aio/content/navigation.json
#	aio/content/tutorial/index.md
#	aio/content/tutorial/toh-pt1.md
#	aio/content/tutorial/toh-pt2.md
#	aio/content/tutorial/toh-pt3.md
#	aio/content/tutorial/toh-pt4.md
#	aio/content/tutorial/toh-pt5.md
#	aio/content/tutorial/toh-pt6.md
#	aio/src/app/embedded/api/api-list.component.ts
#	aio/src/app/layout/doc-viewer/doc-viewer.component.ts
#	aio/src/app/layout/footer/footer.component.html
#	aio/src/app/layout/toc/toc.component.html
#	aio/src/app/search/search.service.ts
#	aio/src/styles/1-layouts/_marketing-layout.scss
#	aio/yarn.lock

											
										
										
											2018-02-27 19:08:59 -05:00
+								**输入**属性是一个带有 `@Input` 装饰器的**可设置**属性。当它通过[属性绑定](#property-binding)的形式被绑定时，值会“流入”这个属性。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								An _Output_ property is an _observable_ property annotated with an `@Output` decorator.
 								The property almost always returns an Angular [`EventEmitter`](api/core/EventEmitter).
 								Values flow _out_ of the component as events bound with an [event binding](#event-binding).
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												Merge remote-tracking branch 'en/master' into aio

# Conflicts:
#	aio/content/guide/ajs-quick-reference.md
#	aio/content/guide/animations.md
#	aio/content/guide/aot-compiler.md
#	aio/content/guide/attribute-directives.md
#	aio/content/guide/bootstrapping.md
#	aio/content/guide/browser-support.md
#	aio/content/guide/component-interaction.md
#	aio/content/guide/component-styles.md
#	aio/content/guide/dependency-injection-in-action.md
#	aio/content/guide/dependency-injection.md
#	aio/content/guide/deployment.md
#	aio/content/guide/displaying-data.md
#	aio/content/guide/form-validation.md
#	aio/content/guide/forms.md
#	aio/content/guide/glossary.md
#	aio/content/guide/http.md
#	aio/content/guide/i18n.md
#	aio/content/guide/ngmodule-faq.md
#	aio/content/guide/ngmodule.md
#	aio/content/guide/npm-packages.md
#	aio/content/guide/pipes.md
#	aio/content/guide/quickstart.md
#	aio/content/guide/reactive-forms.md
#	aio/content/guide/structural-directives.md
#	aio/content/guide/template-syntax.md
#	aio/content/guide/testing.md
#	aio/content/marketing/index.html
#	aio/content/navigation.json
#	aio/content/tutorial/index.md
#	aio/content/tutorial/toh-pt1.md
#	aio/content/tutorial/toh-pt2.md
#	aio/content/tutorial/toh-pt3.md
#	aio/content/tutorial/toh-pt4.md
#	aio/content/tutorial/toh-pt5.md
#	aio/content/tutorial/toh-pt6.md
#	aio/src/app/embedded/api/api-list.component.ts
#	aio/src/app/layout/doc-viewer/doc-viewer.component.ts
#	aio/src/app/layout/footer/footer.component.html
#	aio/src/app/layout/toc/toc.component.html
#	aio/src/app/search/search.service.ts
#	aio/src/styles/1-layouts/_marketing-layout.scss
#	aio/yarn.lock

											
										
										
											2018-02-27 19:08:59 -05:00
+								**输出**属性是一个带有 `@Output` 装饰器的**可观察对象**型的属性。
 								这个属性几乎总是返回 Angular 的[`EventEmitter`](api/core/EventEmitter)。
 								当它通过[事件绑定](#event-binding)的形式被绑定时，值会“流出”这个属性。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								You can only bind to _another_ component or directive through its _Input_ and _Output_ properties.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												Merge remote-tracking branch 'en/master' into aio

# Conflicts:
#	aio/content/guide/ajs-quick-reference.md
#	aio/content/guide/animations.md
#	aio/content/guide/aot-compiler.md
#	aio/content/guide/attribute-directives.md
#	aio/content/guide/bootstrapping.md
#	aio/content/guide/browser-support.md
#	aio/content/guide/component-interaction.md
#	aio/content/guide/component-styles.md
#	aio/content/guide/dependency-injection-in-action.md
#	aio/content/guide/dependency-injection.md
#	aio/content/guide/deployment.md
#	aio/content/guide/displaying-data.md
#	aio/content/guide/form-validation.md
#	aio/content/guide/forms.md
#	aio/content/guide/glossary.md
#	aio/content/guide/http.md
#	aio/content/guide/i18n.md
#	aio/content/guide/ngmodule-faq.md
#	aio/content/guide/ngmodule.md
#	aio/content/guide/npm-packages.md
#	aio/content/guide/pipes.md
#	aio/content/guide/quickstart.md
#	aio/content/guide/reactive-forms.md
#	aio/content/guide/structural-directives.md
#	aio/content/guide/template-syntax.md
#	aio/content/guide/testing.md
#	aio/content/marketing/index.html
#	aio/content/navigation.json
#	aio/content/tutorial/index.md
#	aio/content/tutorial/toh-pt1.md
#	aio/content/tutorial/toh-pt2.md
#	aio/content/tutorial/toh-pt3.md
#	aio/content/tutorial/toh-pt4.md
#	aio/content/tutorial/toh-pt5.md
#	aio/content/tutorial/toh-pt6.md
#	aio/src/app/embedded/api/api-list.component.ts
#	aio/src/app/layout/doc-viewer/doc-viewer.component.ts
#	aio/src/app/layout/footer/footer.component.html
#	aio/src/app/layout/toc/toc.component.html
#	aio/src/app/search/search.service.ts
#	aio/src/styles/1-layouts/_marketing-layout.scss
#	aio/yarn.lock

											
										
										
											2018-02-27 19:08:59 -05:00
+								我们只能通过它的**输入**和**输出**属性将其绑定到**其它**组件。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="alert is-important">
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								Remember that all **components** are **directives**.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												Merge remote-tracking branch 'en/master' into aio

# Conflicts:
#	aio/content/guide/ajs-quick-reference.md
#	aio/content/guide/animations.md
#	aio/content/guide/aot-compiler.md
#	aio/content/guide/attribute-directives.md
#	aio/content/guide/bootstrapping.md
#	aio/content/guide/browser-support.md
#	aio/content/guide/component-interaction.md
#	aio/content/guide/component-styles.md
#	aio/content/guide/dependency-injection-in-action.md
#	aio/content/guide/dependency-injection.md
#	aio/content/guide/deployment.md
#	aio/content/guide/displaying-data.md
#	aio/content/guide/form-validation.md
#	aio/content/guide/forms.md
#	aio/content/guide/glossary.md
#	aio/content/guide/http.md
#	aio/content/guide/i18n.md
#	aio/content/guide/ngmodule-faq.md
#	aio/content/guide/ngmodule.md
#	aio/content/guide/npm-packages.md
#	aio/content/guide/pipes.md
#	aio/content/guide/quickstart.md
#	aio/content/guide/reactive-forms.md
#	aio/content/guide/structural-directives.md
#	aio/content/guide/template-syntax.md
#	aio/content/guide/testing.md
#	aio/content/marketing/index.html
#	aio/content/navigation.json
#	aio/content/tutorial/index.md
#	aio/content/tutorial/toh-pt1.md
#	aio/content/tutorial/toh-pt2.md
#	aio/content/tutorial/toh-pt3.md
#	aio/content/tutorial/toh-pt4.md
#	aio/content/tutorial/toh-pt5.md
#	aio/content/tutorial/toh-pt6.md
#	aio/src/app/embedded/api/api-list.component.ts
#	aio/src/app/layout/doc-viewer/doc-viewer.component.ts
#	aio/src/app/layout/footer/footer.component.html
#	aio/src/app/layout/toc/toc.component.html
#	aio/src/app/search/search.service.ts
#	aio/src/styles/1-layouts/_marketing-layout.scss
#	aio/yarn.lock

											
										
										
											2018-02-27 19:08:59 -05:00
+								记住，所有的**组件**都是**指令**。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								The following discussion refers to _components_ for brevity and
-												fix: 修正自动翻译结果

											
										
										
											2018-03-06 22:25:56 -05:00
+								because this topic is mostly a concern for component authors.
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												Merge remote-tracking branch 'en/master' into aio

# Conflicts:
#	aio/content/guide/ajs-quick-reference.md
#	aio/content/guide/animations.md
#	aio/content/guide/aot-compiler.md
#	aio/content/guide/attribute-directives.md
#	aio/content/guide/bootstrapping.md
#	aio/content/guide/browser-support.md
#	aio/content/guide/component-interaction.md
#	aio/content/guide/component-styles.md
#	aio/content/guide/dependency-injection-in-action.md
#	aio/content/guide/dependency-injection.md
#	aio/content/guide/deployment.md
#	aio/content/guide/displaying-data.md
#	aio/content/guide/form-validation.md
#	aio/content/guide/forms.md
#	aio/content/guide/glossary.md
#	aio/content/guide/http.md
#	aio/content/guide/i18n.md
#	aio/content/guide/ngmodule-faq.md
#	aio/content/guide/ngmodule.md
#	aio/content/guide/npm-packages.md
#	aio/content/guide/pipes.md
#	aio/content/guide/quickstart.md
#	aio/content/guide/reactive-forms.md
#	aio/content/guide/structural-directives.md
#	aio/content/guide/template-syntax.md
#	aio/content/guide/testing.md
#	aio/content/marketing/index.html
#	aio/content/navigation.json
#	aio/content/tutorial/index.md
#	aio/content/tutorial/toh-pt1.md
#	aio/content/tutorial/toh-pt2.md
#	aio/content/tutorial/toh-pt3.md
#	aio/content/tutorial/toh-pt4.md
#	aio/content/tutorial/toh-pt5.md
#	aio/content/tutorial/toh-pt6.md
#	aio/src/app/embedded/api/api-list.component.ts
#	aio/src/app/layout/doc-viewer/doc-viewer.component.ts
#	aio/src/app/layout/footer/footer.component.html
#	aio/src/app/layout/toc/toc.component.html
#	aio/src/app/search/search.service.ts
#	aio/src/styles/1-layouts/_marketing-layout.scss
#	aio/yarn.lock

											
										
										
											2018-02-27 19:08:59 -05:00
+								为简洁起见，以下讨论会涉及到**组件**，因为这个主题主要是组件作者所关心的问题。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								<h3 class="no-toc">Discussion</h3>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 修正自动翻译结果

											
										
										
											2018-03-06 22:25:56 -05:00
+								<h3 class="no-toc">讨论</h3>
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								You are usually binding a template to its _own component class_.
 								In such binding expressions, the component's property or method is to the _right_ of the (`=`).
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								在下面的例子中，`iconUrl` 和 `onSave` 是组件的成员，它们在 `=` 右侧引号语法中被引用了。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								<code-example path="template-syntax/src/app/app.component.html" region="io-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								The `iconUrl` and `onSave` are members of the `AppComponent` class.
 								They are _not_ decorated with `@Input()` or `@Output`.
 								Angular does not object.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								`iconUrl` 和 `onSave` 是 `AppComponent` 类的成员。但它们并没有带 `@Input()` 或 `@Output()` 装饰器。
 								Angular 不在乎。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								**You can always bind to a public property of a component in its own template.**
 								It doesn't have to be an _Input_ or _Output_ property
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								**你总是可以在组件自己的模板中绑定到组件的公共属性，**而不用管它们是否输入（Input）属性或输出（Output）属性。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								A component's class and template are closely coupled.
 								They are both parts of the same thing.
 								Together they _are_ the component.
 								Exchanges between a component class and its template are internal implementation details.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								这是因为组件类和模板是紧耦合的，它们是同一个东西的两个部分，合起来构成组件。
 								组件类及其模板之间的交互属于实现细节。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								### Binding to a different component
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								### 绑定到其它组件
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								You can also bind to a property of a _different_ component.
 								In such bindings, the _other_ component's property is to the _left_ of the (`=`).
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								你也可以绑定到*其它*组件的属性。
 								这种绑定形式下，*其它*组件的属性位于等号（`=`）的*左侧*。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								In the following example, the `AppComponent` template binds `AppComponent` class members to properties of the `HeroDetailComponent` whose selector is `'app-hero-detail'`.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								下面的例子中，`AppComponent` 的模板把 `AppComponent` 类的成员绑定到了 `HeroDetailComponent`（选择器为 `'app-hero-detail'`） 的属性上。
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								<code-example path="template-syntax/src/app/app.component.html" region="io-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								</code-example>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								The Angular compiler _may_ reject these bindings with errors like this one:
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								Angular 的编译器*可能*会对这些绑定报错，就像这样：
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								<code-example language="sh" class="code-shell">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								Uncaught Error: Template parse errors:
 								Can't bind to 'hero' since it isn't a known property of 'app-hero-detail'
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								You know that `HeroDetailComponent` has `hero` and `deleteRequest` properties.
 								But the Angular compiler refuses to recognize them.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								你自己知道 `HeroDetailComponent` 有两个属性 `hero` 和 `detectRequest`，但 Angular 编译器并不知道。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								**The Angular compiler won't bind to properties of a different component
 								unless they are Input or Output properties**.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								**Angular 编译器不会绑定到其它组件的属性上  —— 除非这些属性是输入或输出属性。**
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								There's a good reason for this rule.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								这条规则是有充分理由的。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								It's OK for a component to bind to its _own_ properties.
 								The component author is in complete control of those bindings.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								组件绑定到它*自己*的属性当然没问题。
 								该组件的作者对这些绑定有完全的控制权。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								But other components shouldn't have that kind of unrestricted access.
 								You'd have a hard time supporting your component if anyone could bind to any of its properties.
 								Outside components should only be able to bind to the component's public binding API.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								但是，其它组件不应该进行这种毫无限制的访问。
 								如果任何人都可以绑定到你的组件的任何属性上，那么这个组件就很难维护。
 								所以，外部组件应该只能绑定到组件的公共（允许绑定） API 上。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								Angular asks you to be _explicit_ about that API.
 								It's up to _you_ to decide which properties are available for binding by
 								external components.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								Angular 要求你*显式声明*那些 API。
 								它让*你*可以自己决定哪些属性是可以被外部组件绑定的。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								#### TypeScript _public_ doesn't matter
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								#### TypeScript 的 `public` 是没用的
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								You can't use the TypeScript _public_ and _private_ access modifiers to
 								shape the component's public binding API.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								你不能用 TypeScript 的 `public` 和 `private` 访问控制符来标明组件的公共 API。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								<div class="alert is-important">
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								All data bound properties must be TypeScript _public_ properties.
 								Angular never binds to a TypeScript _private_ property.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								所有数据绑定属性必须是 TypeScript 的公共属性，Angular 永远不会绑定到 TypeScript 中的私有属性。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								</div>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								Angular requires some other way to identify properties that _outside_ components are allowed to bind to.
 								That _other way_ is the `@Input()` and `@Output()` decorators.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								因此，Angular 需要一些其它方式来标记出那些允许被*外部*组件绑定到的属性。
 								这种*其它方式*，就是 `@Input()` 和 `@Output()` 装饰器。
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								### Declaring Input and Output properties
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								### 声明输入与输出属性
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								In the sample for this guide, the bindings to `HeroDetailComponent` do not fail
 								because the data bound properties are annotated with `@Input()` and `@Output()` decorators.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												fix: minor fix and auto translate based on previous result

											
										
										
											2018-03-17 19:26:14 -04:00
+								在本章的例子中，绑定到 `HeroDetailComponent` 不会失败，这是因为这些要进行数据绑定的属性都带有 `@Input()` 和 `@Output()` 装饰器。
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/hero-detail.component.ts" region="input-output-1" title="src/app/hero-detail.component.ts" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								Alternatively, you can identify members in the `inputs` and `outputs` arrays
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								of the directive metadata, as in this example:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								另外，还可以在指令元数据的 `inputs` 或 `outputs` 数组中标记出这些成员。比如这个例子：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/hero-detail.component.ts" region="input-output-2" title="src/app/hero-detail.component.ts" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								### Input or output?
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 输入还是输出？
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								*Input* properties usually receive data values.
 								*Output* properties expose event producers, such as `EventEmitter` objects.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								*输入*属性通常接收数据值。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								*输出*属性暴露事件生产者，如 `EventEmitter` 对象。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The terms _input_ and _output_ reflect the perspective of the target directive.
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												fix: add line break before all figure

											
										
										
											2017-08-03 21:27:48 -04:00
+								_输入_和_输出_这两个词是从目标指令的角度来说的。
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
+								<figure>
-												docs(aio): image sweep (#16609)

* fix(aio): allow code blocks to clear floated images

Previously the negative margin on the code headings were causing
floated images to overlay the start of a code block. Now all code block
successfully clear all floated elements.

* feat(aio): add a `.clear` class for clearing floating images

* fix(aio): tidy up image styles

The css rules for `img.right` and `img.left` allow authors easy
access to floating an image on the left or right, respectively.

The `.image-display` rule which was always found on a figure
has been simplified so that all figures have this styling. It is very
unlikely that a figure will be used outside the content area; and
at this time it seems like `figure` is as good an indicator that we
want this kind of styling as anything.

Now that images are all tagged with width and height values, we cannot
assume to modify these dimensions via CSS as it can cause the image to
lose its correct proportions.  Until we find a better solition we must set
`height` to `auto` when the screen width is below 1300px to ensure that
these images maintain their proportions as they get shrunk to fit.

* docs(aio): general tidy up of image HTML in guides

Previously, the guides have a lot of inline image styling and unnecessary
use of the `image-display` css class.
Images over 700px are problematic for guide docs, so those have been given
specific widths and associated heights.

* docs(aio): use correct anchor for "back to the top" link

The `#toc` anchor does not work when the page is
wide enough that the TOC is floating to the side.

* build(aio): add `#top-of-page` to path variants for link checking

Since the `#top-of-page` is outside the rendered docs
the `checkAnchorLinks` processor doesn't find them
as valid targets for links.
Adding them as a `pathVariant` solves this problem
but will still catch links to docs that do not actually exist.

* fix(aio): ensure that headings clear floated images

* fix(aio): do not force live-example embedded image to 100% size

This made them look too big, generally. Leaving them with no size means
that they will look reasonable in large viewports and switch to 100% width
in narrow viewports.

											
										
										
											2017-05-09 18:53:32 -04:00
+								  <img src="generated/images/guide/template-syntax/input-output.png" alt="Inputs and outputs">
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								</figure>
 								`HeroDetailComponent.hero` is an **input** property from the perspective of `HeroDetailComponent`
 								because data flows *into* that property from a template binding expression.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								从 `HeroDetailComponent` 角度来看，`HeroDetailComponent.hero` 是个**输入**属性，
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								因为数据流从模板绑定表达式流*入*那个属性。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								`HeroDetailComponent.deleteRequest` is an **output** property from the perspective of `HeroDetailComponent`
 								because events stream *out* of that property and toward the handler in a template binding statement.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								从 `HeroDetailComponent` 角度来看，`HeroDetailComponent.deleteRequest` 是个**输出**属性，
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								因为事件从那个属性流*出*，流向模板绑定语句中的处理器。
-												fix: 合并第二版的翻译

											
										
										
											2018-03-07 01:35:57 -05:00
+								<h3 id='aliasing-io'>Aliasing input/output properties</h3>
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												fix: 合并第二版的翻译

											
										
										
											2018-03-07 01:35:57 -05:00
+								<h3 id='aliasing-io'>给输入/输出属性起别名</h3>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								Sometimes the public name of an input/output property should be different from the internal name.
-												fix: 公开改为公共

											
										
										
											2018-03-09 00:23:04 -05:00
+								有时需要让输入/输出属性的公共名字不同于内部名字。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								This is frequently the case with [attribute directives](guide/attribute-directives).
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Directive consumers expect to bind to the name of the directive.
 								For example, when you apply a directive with a `myClick` selector to a `<div>` tag,
 								you expect to bind to an event property that is also called `myClick`.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								这是使用 [attribute 指令](guide/attribute-directives)时的常见情况。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								指令的使用者期望绑定到指令名。例如，在 `<div>` 上用 `myClick` 选择器应用指令时，
 								希望绑定的事件属性也叫 `myClick`。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="myClick" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								However, the directive name is often a poor choice for the name of a property within the directive class.
 								The directive name rarely describes what the property does.
 								The `myClick` directive name is not a good name for a property that emits click messages.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								然而，在指令类中，直接用指令名作为自己的属性名通常都不是好的选择。
 								指令名很少能描述这个属性是干嘛的。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`myClick` 这个指令名对于用来发出 click 消息的属性就算不上一个好名字。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Fortunately, you can have a public name for the property that meets conventional expectations,
 								while using a different name internally.
 								In the example immediately above, you are actually binding *through the* `myClick` *alias* to
 								the directive's own `clicks` property.
-												fix: 公开改为公共

											
										
										
											2018-03-09 00:23:04 -05:00
+								幸运的是，可以使用约定俗成的公共名字，同时在内部使用不同的名字。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								在上面例子中，实际上是把 `myClick` 这个别名指向了指令自己的 `clicks` 属性。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You can specify the alias for the property name by passing it into the input/output decorator like this:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								把别名传进@Input/@Output 装饰器，就可以为属性指定别名，就像这样：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/click.directive.ts" region="output-myClick" title="src/app/click.directive.ts" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<div class="l-sub-section">
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								You can also alias property names in the `inputs` and `outputs` arrays.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You write a colon-delimited (`:`) string with
 								the directive property name on the *left* and the public alias on the *right*:
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								也可在 `inputs` 和 `outputs` 数组中为属性指定别名。
-												fix: 公开改为公共

											
										
										
											2018-03-09 00:23:04 -05:00
+								可以写一个冒号 (`:`) 分隔的字符串，*左侧*是指令中的属性名，*右侧*则是公共别名。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/click.directive.ts" region="output-myClick2" title="src/app/click.directive.ts" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								</div>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a expression-operators}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## Template expression operators
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								## 模板表达式操作符
-												docs(aio): remove unnecessary blank lines

											
										
										
											2017-03-31 07:23:16 -04:00
+								The template expression language employs a subset of JavaScript syntax supplemented with a few special operators
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								for specific scenarios. The next sections cover two of these operators: _pipe_ and _safe navigation operator_.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								模板表达式语言使用了 JavaScript 语法的子集，并补充了几个用于特定场景的特殊操作符。
 								  下面介绍其中的两个：_管道_和_安全导航操作符_。
-												docs(aio): migrate content docs from angular.io

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											2017-02-22 13:09:39 -05:00
+								{@a pipe}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								### The pipe operator ( <span class="syntax">|</span> )
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 管道操作符 ( | )
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The result of an expression might require some transformation before you're ready to use it in a binding.
 								For example, you might display a number as a currency, force text to uppercase, or filter a list and sort it.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								在绑定之前，表达式的结果可能需要一些转换。例如，可能希望把数字显示成金额、强制文本变成大写，或者过滤列表以及进行排序。
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								Angular [pipes](guide/pipes) are a good choice for small transformations such as these.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Pipes are simple functions that accept an input value and return a transformed value.
 								They're easy to apply within template expressions, using the **pipe operator (`|`)**:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								Angular [管道](guide/pipes)对像这样的小型转换来说是个明智的选择。
 								管道是一个简单的函数，它接受一个输入值，并返回转换结果。
 								它们很容易用于模板表达式中，只要使用**管道操作符 (`|`) **就行了。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="pipes-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								The pipe operator passes the result of an expression on the left to a pipe function on the right.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								管道操作符会把它左侧的表达式结果传给它右侧的管道函数。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								You can chain expressions through multiple pipes:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								还可以通过多个管道串联表达式：
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="pipes-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								And you can also [apply parameters](guide/pipes#parameterizing-a-pipe) to a pipe:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								还能对它们使用参数：
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="pipes-3" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The `json` pipe is particularly helpful for debugging bindings:
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								`json` 管道对调试绑定特别有用：
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" linenums="false" title="src/app/app.component.html (pipes-json)" region="pipes-json">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The generated output would look something like this
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								它生成的输出是这样的：
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								<code-example language="json">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								  { "id": 0, "name": "Hercules", "emotion": "happy",
 								    "birthdate": "1970-02-25T08:00:00.000Z",
 								    "url": "http://www.imdb.com/title/tt0065832/",
 								    "rate": 325 }
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								</code-example>
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								{@a safe-navigation-operator}
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								### The safe navigation operator ( <span class="syntax">?.</span> ) and null property paths
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								### 安全导航操作符 ( ?. ) 和空属性路径
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								The Angular **safe navigation operator (`?.`)** is a fluent and convenient way to
 								guard against null and undefined values in property paths.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Here it is, protecting against a view render failure if the `currentHero` is null.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								Angular 的**安全导航操作符 (`?.`) **是一种流畅而便利的方式，用来保护出现在属性路径中 null 和 undefined 值。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								下例中，当 `currentHero` 为空时，保护视图渲染器，让它免于失败。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="safe-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								What happens when the following data bound `title` property is null?
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								如果下列数据绑定中 `title` 属性为空，会发生什么？
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="safe-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								The view still renders but the displayed value is blank; you see only "The title is" with nothing after it.
 								That is reasonable behavior. At least the app doesn't crash.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								这个视图仍然被渲染出来，但是显示的值是空；只能看到 “The title is”，它后面却没有任何东西。
 								这是合理的行为。至少应用没有崩溃。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Suppose the template expression involves a property path, as in this next example
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								that displays the `name` of a null hero.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								假设模板表达式涉及属性路径，在下例中，显示一个空 (null) 英雄的 `firstName`。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								<code-example language="html">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								  The null hero's name is {{nullHero.name}}
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								</code-example>
 								JavaScript throws a null reference error, and so does Angular:
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								JavaScript 抛出了空引用错误，Angular 也是如此：
-												docs(aio): ensure blank lines before HTML blocks in markdown

											
										
										
											2017-03-30 15:04:18 -04:00
-												docs(aio): move cookbooks into guide

Also update all docs with migrated versions from latest angular.io

Fixes #14941

											
										
										
											2017-03-11 08:44:25 -05:00
+								<code-example format="nocode">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								  TypeError: Cannot read property 'name' of null in [null].
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								</code-example>
 								Worse, the *entire view disappears*.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								晕，*整个视图都不见了*。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								This would be reasonable behavior if the `hero` property could never be null.
 								If it must never be null and yet it is null,
 								that's a programming error that should be caught and fixed.
 								Throwing an exception is the right thing to do.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								如果确信 `hero` 属性永远不可能为空，可以声称这是合理的行为。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								如果它必须不能为空，但它仍然是空值，实际上是制造了一个编程错误，它应该被捕获和修复。
 								这种情况应该抛出异常。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								On the other hand, null values in the property path may be OK from time to time,
 								especially when the data are null now and will arrive eventually.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								另一方面，属性路径中的空值可能会时常发生，特别是当我们知道数据最终会出现。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								While waiting for data, the view should render without complaint, and
 								the null property path should display as blank just as the `title` property does.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								当等待数据的时候，视图渲染器不应该抱怨，而应该把这个空属性路径显示为空白，就像上面 `title` 属性那样。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								Unfortunately, the app crashes when the `currentHero` is null.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								不幸的是，当 `currentHero` 为空的时候，应用崩溃了。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): fix relative links

The migrator was updated to automatically fix these links.
See https://github.com/petebacondarwin/aio-migrator/commit/fca5fb0280d6ab5b5c15c9a1b0bcdf0866fc9e37
and https://github.com/petebacondarwin/aio-migrator/commit/3927b7a03893bcbc79a5b7e05bcc90ef24893aca

The result of this is that, going forward, we should ask
authors to include the path from the base href to the thing
being linked. E.g. guide/architecture#intro

											
										
										
											2017-03-11 10:36:40 -05:00
+								You could code around that problem with [*ngIf](guide/template-syntax#ngIf).
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								可以通过用[NgIf](guide/template-syntax#ngIf)代码环绕它来解决这个问题。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="safe-4" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
 								You could try to chain parts of the property path with `&&`, knowing that the expression bails out
 								when it encounters the first null.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								或者可以尝试通过 `&&` 来把属性路径的各部分串起来，让它在遇到第一个空值的时候，就返回空。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="safe-5" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								These approaches have merit but can be cumbersome, especially if the property path is long.
 								Imagine guarding against a null somewhere in a long property path such as `a.b.c.d`.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								这些方法都有价值，但是会显得笨重，特别是当这个属性路径非常长的时候。
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								想象一下在一个很长的属性路径（如 `a.b.c.d`）中对空值提供保护。
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								The Angular safe navigation operator (`?.`) is a more fluent and convenient way to guard against nulls in property paths.
 								The expression bails out when it hits the first null value.
 								The display is blank, but the app keeps rolling without errors.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								Angular 安全导航操作符 (`?.`) 是在属性路径中保护空值的更加流畅、便利的方式。
 								表达式会在它遇到第一个空值的时候跳出。
 								显示是空的，但应用正常工作，而没有发生错误。
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="safe-6" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): update migrated content from anguar.io

											
										
										
											2017-03-27 11:08:53 -04:00
+								</code-example>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
 								It works perfectly with long property paths such as `a?.b?.c?.d`.
-												fix(aio): fix trackBy demo in template-syntax article

											
										
										
											2017-06-09 04:05:16 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								在像 `a?.b?.c?.d` 这样的长属性路径中，它工作得很完美。<a href="#top-of-page">back to top</a>
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): update to remark syntax

											
										
										
											2017-04-10 11:51:13 -04:00
+								<hr/>
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												docs(aio): document the non-null assertion operator

											
										
										
											2017-05-22 16:00:38 -04:00
+								{@a non-null-assertion-operator}
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
-												docs(aio): document the non-null assertion operator

											
										
										
											2017-05-22 16:00:38 -04:00
+								### The non-null assertion operator ( <span class="syntax">!</span> )
-												docs(aio): ensure blank lines before HTML blocks in markdown

											
										
										
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-												fix: translated the rest of template-syntax

											
										
										
											2017-08-05 00:47:14 -04:00
+								### 非空断言操作符（<span class="syntax">!</span>）
-												fix: translate all pure english titles

											
										
										
											2017-08-04 02:06:15 -04:00
-												docs: clarify when non-null-assertion-operator is needed in template-syntax

											
										
										
											2017-06-12 15:50:47 -04:00
+								As of Typescript 2.0, you can enforce [strict null checking](http://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-0.html "Strict null checking in TypeScript") with the `--strictNullChecks` flag. TypeScript then ensures that no variable is _unintentionally_ null or undefined.
-												docs(aio): document the non-null assertion operator

											
										
										
											2017-05-22 16:00:38 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								在 TypeScript 2.0 中，我们可以使用 `--strictNullChecks` 标志强制开启[严格空值检查](http://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-0.html "Strict null checking in TypeScript")。TypeScript 就会确保不存在意料之外的 null 或 undefined。
-												fix: translated the rest of template-syntax

											
										
										
											2017-08-05 00:47:14 -04:00
-												docs: clarify when non-null-assertion-operator is needed in template-syntax

											
										
										
											2017-06-12 15:50:47 -04:00
+								In this mode, typed variables disallow null and undefined by default. The type checker throws an error if you leave a variable unassigned or try to assign null or undefined to a variable whose type disallows null and undefined.
-												docs(aio): document the non-null assertion operator

											
										
										
											2017-05-22 16:00:38 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								在这种模式下，有类型的变量默认是不允许 null 或 undefined 值的，如果有未赋值的变量，或者试图把 null 或 undefined 赋值给不允许为空的变量，类型检查器就会抛出一个错误。
-												fix: translated the rest of template-syntax

											
										
										
											2017-08-05 00:47:14 -04:00
-												docs(aio): fix dangling links

											
										
										
											2017-07-10 05:01:54 -04:00
+								The type checker also throws an error if it can't determine whether a variable will be null or undefined at runtime.
 								You may know that can't happen but the type checker doesn't know.
-												docs: clarify when non-null-assertion-operator is needed in template-syntax

											
										
										
											2017-06-12 15:50:47 -04:00
+								You tell the type checker that it can't happen by applying the post-fix
-												docs(aio): fix dangling links

											
										
										
											2017-07-10 05:01:54 -04:00
+								[_non-null assertion operator (!)_](http://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-0.html#non-null-assertion-operator "Non-null assertion operator").
-												docs: clarify when non-null-assertion-operator is needed in template-syntax

											
										
										
											2017-06-12 15:50:47 -04:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								如果类型检查器在运行期间无法确定一个变量是 null 或 undefined，那么它也会抛出一个错误。
-												fix: translated the rest of template-syntax

											
										
										
											2017-08-05 00:47:14 -04:00
+								我们自己可能知道它不会为空，但类型检查器不知道。
 								所以我们要告诉类型检查器，它不会为空，这时就要用到[*非空断言操作符*](http://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-0.html#non-null-assertion-operator "Non-null assertion operator")。
-												docs(aio): fix dangling links

											
										
										
											2017-07-10 05:01:54 -04:00
+								The _Angular_ **non-null assertion operator (`!`)** serves the same purpose in an Angular template.
-												build(aio): new migration

											
										
										
											2017-03-31 19:57:13 -04:00
-												fix: translated the rest of template-syntax

											
										
										
											2017-08-05 00:47:14 -04:00
+								*Angular* 模板中的**非空断言操作符（`!`）也是同样的用途。
-												docs: clarify when non-null-assertion-operator is needed in template-syntax

											
										
										
											2017-06-12 15:50:47 -04:00
+								For example, after you use [*ngIf](guide/template-syntax#ngIf) to check that `hero` is defined, you can assert that
 								`hero` properties are also defined.
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								例如，在用[*ngIf](guide/template-syntax#ngIf)来检查过 `hero` 是已定义的之后，就可以断言 `hero` 属性一定是已定义的。
-												fix: translated the rest of template-syntax

											
										
										
											2017-08-05 00:47:14 -04:00
-												docs(aio): document the non-null assertion operator

											
										
										
											2017-05-22 16:00:38 -04:00
+								<code-example path="template-syntax/src/app/app.component.html" region="non-null-assertion-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(aio): document the non-null assertion operator

											
										
										
											2017-05-22 16:00:38 -04:00
+								</code-example>
-												docs: clarify when non-null-assertion-operator is needed in template-syntax

											
										
										
											2017-06-12 15:50:47 -04:00
+								When the Angular compiler turns your template into TypeScript code,
 								it prevents TypeScript from reporting that `hero.name` might be null or undefined.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								在 Angular 编译器把你的模板转换成 TypeScript 代码时，这个操作符会防止 TypeScript 报告 "`hero.name` 可能为 null 或 undefined"的错误。
-												fix: translated the rest of template-syntax

											
										
										
											2017-08-05 00:47:14 -04:00
-												docs(aio): update ToH for CLI (#19811)


											
										
										
											2017-11-06 13:02:18 -05:00
+								Unlike the [_safe navigation operator_](guide/template-syntax#safe-navigation-operator "Safe navigation operator (?.)"),
-												docs: clarify when non-null-assertion-operator is needed in template-syntax

											
										
										
											2017-06-12 15:50:47 -04:00
+								the **non-null assertion operator** does not guard against null or undefined.
 								Rather it tells the TypeScript type checker to suspend strict null checks for a specific property expression.
-												feat: 自动在中英文之间添加空格，以改善排版

											
										
										
											2018-03-20 05:09:18 -04:00
+								与[_安全导航操作符_](guide/template-syntax#safe-navigation-operator "Safe naviation operator (?.)")不同的是，**非空断言操作符**不会防止出现 null 或 undefined。
-												fix: translated the rest of template-syntax

											
										
										
											2017-08-05 00:47:14 -04:00
+								它只是告诉 TypeScript 的类型检查器对特定的属性表达式，不做 "严格空值检测"。
-												docs: clarify when non-null-assertion-operator is needed in template-syntax

											
										
										
											2017-06-12 15:50:47 -04:00
-												fix: translated the rest of template-syntax

											
										
										
											2017-08-05 00:47:14 -04:00
+								You'll need this template operator when you turn on strict null checks. It's optional otherwise.
-												docs(aio): document the non-null assertion operator

											
										
										
											2017-05-22 16:00:38 -04:00
-												fix: translated the rest of template-syntax

											
										
										
											2017-08-05 00:47:14 -04:00
+								如果我们打开了严格控制检测，那就要用到这个模板操作符，而其它情况下则是可选的。
-												fix: all "back to top" links

											
										
										
											2017-07-30 10:11:36 -04:00
 								<a href="#top-of-page">back to top</a>
 								<a href="#top-of-page">回到顶部</a>
-												fix(aio): fix trackBy demo in template-syntax article

											
										
										
											2017-06-09 04:05:16 -04:00
 								<hr/>
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
-												docs(compiler): document the $any type cast function (#20968)

Closes #20966

PR Close #20968

											
										
										
											2017-12-12 15:51:38 -05:00
+								{@a any-type-cast-function}
 								## The `$any` type cast function (`$any( <expression> )`)
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								## 类型转换函数 `$any` （$any( <表达式> )）
-												docs(compiler): document the $any type cast function (#20968)

Closes #20966

PR Close #20968

											
										
										
											2017-12-12 15:51:38 -05:00
+								Sometimes a binding expression will be reported as a type error and it is not possible or difficult
 								to fully specify the type. To silence the error, you can use the `$any` cast function to cast
 								the expression to [the `any` type](http://www.typescriptlang.org/docs/handbook/basic-types.html#any).
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								有时候，绑定表达式可能会报类型错误，并且它不能或很难指定类型。要消除这种报错，你可以使用 `$any` 转换函数来把表达式转换成 [`any` 类型](http://www.typescriptlang.org/docs/handbook/basic-types.html#any)。
-												docs(compiler): document the $any type cast function (#20968)

Closes #20966

PR Close #20968

											
										
										
											2017-12-12 15:51:38 -05:00
+								<code-example path="template-syntax/src/app/app.component.html" region="any-type-cast-function-1" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(compiler): document the $any type cast function (#20968)

Closes #20966

PR Close #20968

											
										
										
											2017-12-12 15:51:38 -05:00
+								</code-example>
 								In this example, when the Angular compiler turns your template into TypeScript code,
 								it prevents TypeScript from reporting that `marker` is not a member of the `Hero`
 								interface.
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								在这个例子中，当 Angular 编译器把模板转换成 TypeScript 代码时，`$any` 表达式可以防止 TypeScript 编译器报错说 `marker` 不是 `Hero` 接口的成员。
-												docs(compiler): document the $any type cast function (#20968)

Closes #20966

PR Close #20968

											
										
										
											2017-12-12 15:51:38 -05:00
+								The `$any` cast function can be used in conjunction with `this` to allow access to undeclared members of
 								the component.
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								`$any` 转换函数可以和 `this` 联合使用，以便访问组件中未声明过的成员。
-												docs(compiler): document the $any type cast function (#20968)

Closes #20966

PR Close #20968

											
										
										
											2017-12-12 15:51:38 -05:00
+								<code-example path="template-syntax/src/app/app.component.html" region="any-type-cast-function-2" title="src/app/app.component.html" linenums="false">
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												docs(compiler): document the $any type cast function (#20968)

Closes #20966

PR Close #20968

											
										
										
											2017-12-12 15:51:38 -05:00
+								</code-example>
 								The `$any` cast function can be used anywhere in a binding expression where a method call is valid.
-												fix: 纠正错误及翻译遗漏的部分

											
										
										
											2018-03-12 01:04:24 -04:00
+								`$any` 转换函数可以在绑定表达式中任何可以进行方法调用的地方使用。
-												docs(aio): migrate content docs from angular.io

This content was generated by a tool: https://github.com/petebacondarwin/aio-migrator

											
										
										
											2017-02-22 13:09:39 -05:00
+								## Summary
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
 								## 小结
-												refactor(aio): move content-related images to `content/images/`

											
										
										
											2017-04-26 08:11:02 -04:00
+								You've completed this survey of template syntax.
-												docs(aio): merge latest chinese translations

											
										
										
											2017-07-22 23:51:25 -04:00
+								Now it's time to put that knowledge to work on your own components and directives.
-												fix: 修正最后一版的全部翻译

											
										
										
											2018-03-03 08:06:01 -05:00
-												fix: 修正自动翻译结果

											
										
										
											2018-03-06 22:25:56 -05:00
+								我们完成了模板语法的概述。现在，该把如何写组件和指令的知识投入到实际工作当中了。