js delete删除对象属性

转自：http://www.jb51.net/article/54247.htm

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.删除不了原型链中的变量，如：

fun.prototype.age = 18;
delete obj.age;
console.log(obj.age) //18