<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>