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>