代码改变世界

js delete 用法

2014-06-05 17:53  yuan001  阅读(745)  评论(0)    收藏  举报 
1,对象属性删除
 
function fun(){
      this.name = 'mm';
  }
  var obj = new fun();
   console.log(obj.name);//mm
   delete obj.name;
   console.log(obj.name); //undefined
 
2,变量删除 
 
var name = 'lily';
       delete name;
       console.log(name); //lily
 
直接用delelte删除不了变量
 
3,删除不了原型链中的变量
 
       fun.prototype.age = 18;
        delete obj.age;
        console.log(obj.age) //18