anchor.diff:    
     We'll complete `HeroService` by creating `post`, `put` and `delete` methods to meet our new requirements.
   
  -  我们将为`HeroService`添加`post`、`put`和`delete`的http调用来彻底满足我们的需求。
  +  我们将为`HeroService`添加`post`、`put`和`delete`的http调用来满足我们的需求。
   
   :marked
     ### Post
  
positive.code: 
  :marked
    Add a save method to `HeroDetailComponent` and call the corresponding save method in `HeroesService`.
  
  +makeExcerpt('app/hero-detail.component.ts', 'save')
  
  
negative.code: block hero-detail-comp-updates
    :marked
      ### Add/Edit in the *HeroDetailComponent*
      
      ### 在*HeroDetailComponent*中添加和编辑英雄 
  
      We already have `HeroDetailComponent` for viewing details about a specific hero. 
      Add and Edit are natural extensions of the detail view, so we are able to reuse `HeroDetailComponent` with a few tweaks. 
  