set-document-title.jade draft translation is done.
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@ -4,62 +4,100 @@ a(id='top')
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:marked
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Our app should be able to make the browser title bar say whatever we want it to say.
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This cookbook explains how to do it.
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我们的应用程序应该能让浏览器标题栏显示我们想要它显示的内容。本*食谱*解释怎么做。
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:marked
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**See the [live example](/resources/live-examples/cb-set-document-title/ts/plnkr.html)**.
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**请看[在线例子](/resources/live-examples/cb-set-document-title/ts/plnkr.html)**.
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.l-sub-section
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img(src='/resources/images/devguide/plunker-separate-window-button.png' alt="pop out the window" align="right" style="margin-right:-20px")
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:marked
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To see the browser Title bar changes,
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pop out the preview window by clicking the blue 'X' button in the upper right corner.
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要看到浏览器标题的变化，点击预览窗口右上角的'X'按钮，弹出窗口。
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:marked
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## The problem with *<title>*
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## *<title>*的问题
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The obvious approach is to bind a property of the component to the HTML `<title>` like this:
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最显然的方法是绑定一个组件属性到HTML的`<title>`标签上，像这样：
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code-example(format='')
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<title>{{This_Does_Not_Work}}</title>
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:marked
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Sorry but that won't work.
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The root component of our application is an element contained within the `<body>` tag.
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The HTML `<title>` is in the document `<head>`, outside the body, making it inaccessible to Angular data binding.
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对不起，但是这样不行。我们应用程序的是一个被包含在`<body>`标签的元素。该HTML`<title>`在文档的`<head>`元素里，在主体类容之外，这样Angular的数据绑定无法访问它。
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We could grab the browser `document` object and set the title manually.
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That's dirty and undermines our chances of running the app outside of a browser someday.
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我们可以得到浏览器的`document`对象，并且手动设置标题。但是这样不干净，并且把我们将来有一天在浏览器之外运行应用程序的机会给剥夺了。
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.l-sub-section
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:marked
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Running your app outside a browser means that you can take advantage of server-side
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pre-rendering for near-instant first app render times and for SEO. It means you could run from
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inside a Web Worker to improve your app's responsiveness by using multiple threads. And it
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means that you could run your app inside Electron.js or Windows Universal to deliver it to the desktop.
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在浏览器之外运行你的应用程序的意思是你利用服务器端预先渲染，实现几乎即时的第一次应用程序渲染时间，同时支持SEO（搜索引擎优化）。它意味着你可以在一个
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Web Worker中运行你的应用程序，通过使用多个线程增强你应用程序的响应性。并且它还意味着你可以在Electron.js或者Windows Universal里面运行，发布给桌面（环境）。
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:marked
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## Use the *Title* service
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## 使用*Title*服务
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Fortunately, Angular 2 bridges the gap by providing a `Title` service as part of the *Browser platform*.
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The [Title](../api/platform/browser/Title-class.html) service is a simple class that provides an API
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for getting and setting the current HTML document title:
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幸运的是，Angular 2在*Browser platform*包中，提供了一个`Title`服务，桥接这个间隔。
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该[Title](../api/platform/browser/Title-class.html)服务是一个简单地类，提供了一个API，用来获取和设置当前HTML文档的标题。
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* `getTitle() : string` — Gets the title of the current HTML document.
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*`getTitle():string` — 获取当前HTML文档的标题。
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* `setTitle( newTitle : string )` — Sets the title of the current HTML document.
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* `setTitle( newTitle: string)` — 设置当前HTML文档的标题。
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While this class is part of the Browser platform package, it is *not part of the default Browser
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platform providers* that Angular loads automatically.
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This means as we bootstrap our application using the Browser platform `boostrap()`
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function, we'll also have to include `Title` service explicitly as one of the bootstrap providers:
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虽然该类是Browser platform包的一部分，它*不是*Angular自动默认装载的*Browser platform providers的一部分*。
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这意味着，我们在使用Browser platform的`bootstrap()`函数来引导我们的应用程序时，我们必须要明确地把`Title`服务作为引导的providers之一加入进来：
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+makeExample( "cb-set-document-title/ts/app/main.ts", "bootstrap-title", "app/main.ts (provide Title service)" )(format='.')
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:marked
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Once we've explicitly provided the `Title` service we can then inject the `Title` service into any of our
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custom application components and services.
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一旦我们明确的提供了`Title`服务，我们就能把`Title`服务注入到任何一个我们自定义的应用程序组件和服务里面。
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Let's inject the `Title` service into the root `AppComponent` and expose a bindable `setTitle` method that calls it:
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让我们把`Title`服务注入到根`AppComponent`组件，并暴漏一个调用该服务的，可以绑定的`setTitle`方法：
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+makeExample( "cb-set-document-title/ts/app/app.component.ts", "class", "app/app.component.ts (class)" )(format='.')
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:marked
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We bind that method to three anchor tags and, voilà!
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我们绑定这个方法到三个锚标签，瞧瞧！
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figure.image-display
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img(src="/resources/images/cookbooks/set-document-title/set-title-anim.gif" alt="Set title")
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:marked
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Here's the complete solution
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这里是一个完整的方案（代码）。
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+makeTabs(
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`cb-set-document-title/ts/app/main.ts,
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@ -77,16 +115,25 @@ figure.image-display
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.l-main-section
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:marked
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## Why we provide the *Title* service in *bootstrap*
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## 我们为什么提供在*bootstrap*里面这个*Title*服务
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We generally recommended providing application-wide services in the root application component, `AppComponent`.
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我们一般推荐在应用程序根组件`AppComponent`提供应用程序全范围服务。
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Here we recommend registering the title service during bootstrapping,
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a location we reserve for configuring the runtime Angular enviroment.
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这里，我们推荐在引导过程中注册这个标题服务，一个我们为设置Angular运行环境而保留的地方。
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That's exactly what we're doing.
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The `Title` service is part of the Angular *browser platform*.
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If we bootstrap our application into a different platform,
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we'll have to provide a different `Title` service that understands the concept of a "document title" for that specific platform.
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Ideally the application itself neither knows nor cares about the runtime environment.
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这正好是我们在做的。该`Title`服务是Angular *browser platform*的一部分。如果我们在另一个不同的平台上引导我们的应用程序，我们将会提供一个不同的`Title`服务，该服务能
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明白这个指定平台的"文档标题"概念。
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:marked
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[Back to top](#top)
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[回到顶部](#top)
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