anchor.diff:    Here's the content for the aforementioned component CSS files.  
     
     上述组件的CSS文件内容如下：
  +  
   +makeTabs(
     `toh-5/ts/app/hero-detail.component.css,
     toh-5/ts/app/dashboard.component.css`,
     null,
     `app/hero-detail.component.css,
     app/dashboard.component.css`)
  +
   :marked
     ### Style the Navigation Links
  +  
     ### 美化导航链接
  +  
     The designers gave us CSS to make the navigation links in our `AppComponent` look more like selectable buttons.
     We cooperated by surrounding those links in `<nav>` tags.
     
  
positive.code:   如有必要，也可以编辑`index.html`来引用这个样式表。
    
  +makeExample('toh-5/ts/index.html','css', 'index.html (link ref)')(format=".")
  :marked
   Look at the app now. Our dashboard, heroes, and navigation links are styling!
   
  
negative.code:   我们有活儿干了，就从这些英雄列表开始吧。
    
    ### Share the *HeroService*
    
    ### 共享*HeroService*
    
    We'd like to re-use the `HeroService` to populate the component's `heroes` array.
  