js 中对象属性特性2

对象的存储描述：

get   和   set 方法

 <script>
      var obj ={
          get age(){
              return 22
          },
          set age(value){
             console.log(value)
          }
      }
     console.log(obj.age)
     obj.age = 23

     var obj1 ={
         x:1,
         y:2,
         z:3,
         get zhouchang(){
             return this.x+this.y+this.z
         },
         set two(value){
             this.x*=value
             this.y*=value
             this.z*=value
         }
     }
     console.log(obj1.zhouchang)
     obj1.two =2
     console.log(obj1.zhouchang)

     Object.defineProperty(obj1,"k",{
         get : function(){
             return 29
         }
     })
     console.log(obj1.k)
 </script>