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block includes
include _util-fns
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:marked
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Angular applications are made up of _components_.
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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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Angular 应用是由*组件*组成的。
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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('src/app/app.component.ts')(format='.')
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block qs-src-online-and-local
.l-sub-section
:marked
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Try this **<live-example noDownload>QuickStart example on Plunker</live-example>** without installing anything.
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Try it locally with the [***QuickStart seed***](guide/setup.html "Setup for local development with the QuickStart seed")
and prepare for development of a real Angular application.
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试试这个**<live-example noDownload>Plunker上的QuickStart范例</live-example>**。
也可以在本地使用[***QuickStart种子工程***](guide/setup.html "Setup for local development with the QuickStart seed")来为开发真实的Angular应用做好准备。
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:marked
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Every component begins with an `@Component` [decorator](glossary.html#decorator '"decorator" explained')
function that takes a _metadata_ object. The metadata object 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')函数开始，
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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('src/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.
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The message starts with "Hello" and ends with `{{name}}`,
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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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Interpolation binding is one of many Angular features you'll discover in this documentation.
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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，
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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:marked
In the example, change the component class's `name` property from `'Angular'` to `'World'` and see what happens.
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在这个例子中，把组件类的`name`属性从`'Angular'`改为`'World'`，看看会怎么样。
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.callout.is-helpful
header A word about TypeScript
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header 关于 TypeScript
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p.
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
### Next step
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### 下一步
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Start [**learning Angular**](guide/learning-angular.html "Learning Angular").
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开始[**学习 Angular**](guide/learning-angular.html "学习 Angular").
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