ts-to-ts.jade 部分翻译
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@ -15,30 +15,49 @@ include ../../../../_includes/_util-fns
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code examples to ES5, so that they can be applied to Angular 2 JavaScript
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applications.
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因为TypeScript是一个很受欢迎的Angular 2的语言选择，你在网络上和本站看到的很多代码例子
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都是以TypeScript编写的。本烹饪书包含如何把这些代码编译到ES5的食谱，这样它们可以被应用
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到Angular 2的JavaScript应用程序里。
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<a id="toc"></a>
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:marked
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## Table of contents
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## 目录
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[Modularity: imports and exports](#modularity)
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[模块化：导入和导出](#modularity)
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[Classes and Class Metadata](#class-metadata)
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[类和类元数据](#class-metadata)
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[Input and Output Metadata](#property-metadata)
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[导入和导出元数据](#property-metadata)
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[Dependency Injection](#dependency-injection)
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[依赖注入](#dependency-injection)
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[Host and Query Metadata](#other-property-metadata)
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[宿主和查询元素据](#other-property-metadata)
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**Run and compare the live [TypeScript](/resources/live-examples/cb-ts-to-js/ts/plnkr.html) and
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[JavaScript](/resources/live-examples/cb-ts-to-js/js/plnkr.html) code shown in this cookbook.**
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**运行并比较本烹饪书里面的在线[TypeScript](/resources/live-examples/cb-ts-to-js/ts/plnkr.html)和[JavaScript](/resources/live-examples/cb-ts-to-js/js/plnkr.html)代码**
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a(id="modularity")
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.l-main-section
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:marked
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## Importing and Exporting
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## 导入和导出
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- var top="vertical-align:top"
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table(width="100%")
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col(width="50%")
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@ -51,20 +70,29 @@ table(width="100%")
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:marked
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### Importing Angular 2 Code
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### 导入Angular 2代码
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In TypeScript code, Angular 2 classes, functions, and other members
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are imported with TypeScript `import` statements:
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在TypeScript代码中，Angular 2是利用TypeScript的`import`声明来导入类、函数和其他成员的。
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+makeExample('cb-ts-to-js/ts/app/main.ts', 'ng2import')(format="." )
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td
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:marked
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### Accessing Angular 2 Code through the ng global
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### 通过全局ng来访问Angular 2代码
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In JavaScript code, when using
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[the Angular 2 packages](../glossary.html#!#scoped-package),
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we can access Angular code through the global `ng` object. In the
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nested members of this object we'll find everything we would import
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from `angular2` in TypeScript:
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在JavaScript代码中，当使用[Angular 2库](../glossary.html#!#scoped-package)时，
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我们可以通过全局的`ng`对象来访问Angular代码。在这个对象嵌套很多成员中，我们能找到所有在TypeScript里面导入的`angular2`
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+makeExample('cb-ts-to-js/js/app/main.js', 'ng2import')(format="." )
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@ -73,15 +101,21 @@ table(width="100%")
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:marked
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### Importing and Exporting Application Code
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### 导入和导出应用程序代码
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Each file in an Angular 2 TypeScript application constitutes a
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TypeScript module. When we want to make something from a module available
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to other modules, we `export` it.
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在Angular 2 TypeScript应用里，每个文件组成一个TypeScript模块。当需要让一个模块在其他模块中可见时，我们`export`它。
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+makeExample('cb-ts-to-js/ts/app/hero.component.ts', 'appexport')(format="." )
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:marked
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In other modules we can then `import` things that have been exported
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elsewhere.
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然后，我们就可以在模块`import`其它地方导出的东西。
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+makeExample('cb-ts-to-js/ts/app/main.ts', 'appimport')(format="." )
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@ -89,9 +123,14 @@ table(width="100%")
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:marked
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### Sharing Application Code
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### 共享应用程序代码
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In an Angular 2 JavaScript application, we load each file to the page
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using a `<script>` tag. Each file can make things available to other
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files via the shared global `window` scope.
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在Angular 2 JavaScript应用程序里，我们在页面里面通过`<script>`标签来加载每个文件。
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每个文件都能通过把所有东西放到全局`window`来互相共享·
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We often introduce an application namespace
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object (such as `"app"`) onto `window` and attach everything we need
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[Immediately Invoked Function Expression (IIFE)](https://en.wikipedia.org/wiki/Immediately-invoked_function_expression).
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These practices together prevent our code from
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polluting the global scope.
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我们经常在`window`上附加一个应用程序命名空间对象（比如`"app"`），然后把所有需要共享的东西都附加到这个空间对象。
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也可以把我们的代码包装到一个[立即调用函数表达式IIFE](https://en.wikipedia.org/wiki/Immediately-invoked_function_expression)。
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使用这些实践可以防止我们的代码污染全局范围。
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+makeExample('cb-ts-to-js/js/app/hero.component.js', 'appexport')(format="." )
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:marked
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We can then access anything from this shared namespace in
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other files.
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然后我们就可以从这个共享的命名空间来访问其他文件。
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+makeExample('cb-ts-to-js/js/app/main.js', 'appimport')(format="." )
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Note that the order of `<script>` tags on the page is significant.
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We must load a file that defines a shared member before
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a file that uses that member.
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注意，页面上的`<script>`标签的顺序非常重要。我们必须要先加载定义共享成员的文件，
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然后再加载使用该共享成员的文件。
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.alert.is-helpful
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:marked
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@ -121,6 +169,10 @@ table(width="100%")
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use CommonJS modules and the `require` function to load Angular 2 framework code.
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We would then use `module.exports` and `require` to export and import application
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code.
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另外，我们可以在一个Angular 2 JavaScript项目中，使用模块加载器(比如Webpack或者Browserify)。
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在这样的项目中，我们使用CommonJS模块和`require`函数来加载Angular 2框架代码。
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然后用`module.exports`和`require`来导出和导入应用程序代码。
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a(id="class-metadata")
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@ -128,6 +180,8 @@ a(id="class-metadata")
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:marked
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## Classes and Class Metadata
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## 类和类元数据
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- var top="vertical-align:top"
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table(width="100%")
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col(width="50%")
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td
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:marked
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### Classes
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### 类
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We put most of our Angular 2 TypeScript code into TypeScript classes.
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我们把绝大多数Angular 2 TypeScript代码放到TypeScript类中。
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+makeExample('cb-ts-to-js/ts/app/hero.component.ts', 'class')(format="." )
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:marked
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### Constructors and Prototypes
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### 构造函数和原型
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ES5 JavaScript has no classes. We use the constructor
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pattern instead which works with Angular 2 as well as classes do.
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ES5 JavaScript不支持类。取而代之，我们使用构造模式（constructor pattern），和类一样，它可以跟Angular 2一起工作。
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+makeExample('cb-ts-to-js/js/app/hero.component.js', 'constructorproto')(format="." )
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:marked
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### Metadata with Decorators
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### 拥有装饰器的元数据
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Most Angular 2 classes have one or more TypeScript *decorators*
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attached to provide configuration and metadata. For example,
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a component must have a [`@Component`](../api/core/Component-decorator.html) decorator.
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a component must have a [`@Component`](../api/core/Component-decorator.html) decorator.
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+makeExample('cb-ts-to-js/ts/app/hero.component.ts', 'metadata')(format="." )
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