anchor.diff:  :marked
     We're finished with the application routes.
   
  -  我们已经完成了本应用的路由。
  +  我们已经完成了本应用的路由的配置。
   
   
     We won't add a `'Hero Detail'` link to the template because users
  
positive.code:   using the `Location` service we injected previously.
  
    现在用户可以点击`AppComponent`中的两个链接，或点击浏览器的“后退”按钮。
    我们来添加第三个选项：一个`goBack`方法，使用之前注入的`Location`服务实现浏览器的历史堆栈的后退。
  
  +makeExcerpt('app/hero-detail.component.ts', 'goBack')
  
  
negative.code: :marked
    Our goal is to move the detail to its own view and navigate to it when the user decides to edit a selected hero.
  
    我们要做的是将英雄详情移动到它自己的视图，并在用户决定编辑一个英雄时导航到它。
  
    Delete the `<h1>` at the top (we forgot about it during the `AppComponent`-to-`HeroesComponent` conversion).
    
    删除顶部的`<h1>`（在从`AppComponent`转到`HeroesComponent`时忘记修改它了）。
    
    Delete the last line of the template with the `<my-hero-detail>` tags.
  
  