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block includes
include _util-fns
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- var _on_Plunkr = 'on Plunkr';
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:marked
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Angular applications are made of _components_.
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Angular 应用是由*组件*组成的。
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A _component_ is the combination of an HTML template and a component class that controls a portion of the screen. Here is an example of a component that displays a simple string:
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*组件*由 HTML 模板和组件类组成，组件类控制视图。下面是一个显示简单字符串的组件:
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+makeExample('app/app.component.ts')(format='.')
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:marked
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You can try this out without installing anything. Open the <live-example>QuickStart example !{_on_Plunkr}</live-example> in another tab
and follow along.
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无需任何安装就可以试试它。在另一个浏览器标签页打开并跟随<live-example> Plunker 上的《快速起步》例子</live-example>。
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Every component begins with an `@Component` [!{_decorator}](glossary.html#!{_decorator} '"!{_decorator}" explained')
<span if-docs="ts">function</span> that
<span if-docs="ts">takes a _metadata_ object. The metadata object</span> describes how the HTML template and component class work together.
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每个组件都以`@Component`[装饰器](glossary.html#!{_decorator} '"!{_decorator}" explained')<span if-docs="ts">函数</span>开始，它<span if-docs="ts">接受一个_元数据_对象参数。该元素对象</span>描述了 HTML 模板和组件类是如何一起工作的。
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The `selector` property tells Angular to display the component inside a custom `<my-app>` tag in the `index.html`.
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`selector`属性为 Angular 指定了在`index.html`中的自定义`<my-app>`标签里显示该组件。
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+makeExample('index.html','my-app','index.html (inside <body>)')(format='.')
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:marked
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The `template` property defines a message inside an `<h1>` header.
The message starts with "Hello" and ends with `{{name}}`
which is an Angular [interpolation binding](guide/displaying-data.html) expression.
At runtime, Angular replaces `{{name}}` with the value of the component's `name` property.
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`template`属性定义了`<h1>`标题里的一条消息。
该消息以 “Hello” 开始，以 Angular [插值绑定](guide/displaying-data.html)表达式`{{name}}`结束。
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在运行时，
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In the example, change the component class's `name` property from `'Angular'` to `'World'` and see what happens.
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在本例中，将组件类的`name`属性从`'Angular'`改为`'World'`，看看会发生什么。
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Interpolation binding is one of many Angular features you'll discover in this documentation.
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插值绑定是 Angular 的特征之一。你将在本文档中探索更多 Angular 的特征。
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+ifDocsFor('ts')
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.callout.is-helpful
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header A word about TypeScript
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header 关于 TypeScript
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p.
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This example is written in <a href="http://www.typescriptlang.org/" target="_blank" title="TypeScript">TypeScript</a>, a superset of JavaScript. Angular
uses TypeScript because its types make it easy to support developer productivity with tooling. You can also write Angular code in JavaScript; <a href="cookbook/ts-to-js.html">this guide</a> explains how.
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p.
本例是用 JavaScript 的一个超集 <a href="http://www.typescriptlang.org/" target="_blank" title="TypeScript">TypeScript</a> 编写的。
Angular 使用 TypeScript 是因为它的类型可以帮助工具提高开发者效率。你也可以用 JavaScript 编写 Angular 代码，参见<a href="cookbook/ts-to-js.html">本指南</a>。
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.l-sub-section
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:marked
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### Next step
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### 下一步
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To learn how to write a real application, your next step is to set up a local development
environment and begin exploring with code. The [**Developer Guide**](guide/index.html)
shows you how.
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要学习如何编写应用，你的下一步是构建本地开发环境，并开始一边编程一边探索，参见[**开发者指南**](guide/index.html)。
