js 中对象属性特性2

对象的存储描述：
get 和 set 方法
 1 <script>
 2      var obj ={
 3          get age(){
 4              return 22
 5          },
 6          set age(value){
 7             console.log(value)
 8          }
 9      }
10     console.log(obj.age)
11     obj.age = 23
12 
13     var obj1 ={
14         x:1,
15         y:2,
16         z:3,
17         get zhouchang(){
18             return this.x+this.y+this.z
19         },
20         set two(value){
21             this.x*=value
22             this.y*=value
23             this.z*=value
24         }
25     }
26     console.log(obj1.zhouchang)
27     obj1.two =2
28     console.log(obj1.zhouchang)
29 
30     Object.defineProperty(obj1,"k",{
31         get : function(){
32             return 29
33         }
34     })
35     console.log(obj1.k)
36 </script>