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

1,对象属性删除

1 2 3 4 5 6 7 8 9 10 11 12 13

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

1 2 3

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

1 2 3

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