js delete删除对象属性，delete删除不了变量及原型链中的变量

一、delete删除对象属性

function fun(){
 
　　this.name = 'gg';
 
}
 
var obj = new fun();
 
console.log(obj.name);//gg
 
delete obj.name;
 
console.log(obj.name); //undefined

二、delete删除不了变量

var name = 'gg';
delete name;
console.log(name); //gg

三、delete删除不了原型链的变量

fun.prototype.age = 11;
delete obj.age;
console.log(obj.age) //11