anchor.diff:    The `defaultColor` property has a setter that overrides the hard-coded default color, "red".
     You don't need a getter.
   
  -  `defaultColor`属性是一个setter函数，它代替了硬编码的默认颜色“red”。不需要getter函数。
  +  `defaultColor`属性是一个 setter 函数，它代替了硬编码的默认颜色 “red”。不需要 getter 函数。
   
     How do you bind to it? The app is already using `myHighlight` attribute name as a binding target.
   
  
positive.code:   :marked
      The `@HostListener` !{_decorator} refers to the DOM element that hosts an attribute directive, the `<p>` in this case.
  
      `@HostListener`装饰器引用的是我们这个属性型指令的宿主元素，在这个例子中就是`<p>`。
  
      It is possible to attach event listeners by manipulating the host DOM element directly, but
  
      可以通过直接操纵DOM元素的方式给宿主DOM元素挂上一个事件监听器，但是
  
      there are at least three problems with such an approach:
  
  
negative.code: 
    记住，*组件也是指令*。
    只要需要，就可以通过把它们依次串在模板中来为组件添加多个属性绑定。
    下面这个例子中就把`a`、`b`、`c`属性设置为了字符串字面量'a'、'b'、'c'。
  code-example(format="." ).
    &lt;my-component [a]="'a'" [b]="'b'" [c]="'c'">&lt;my-component>
  :marked
  