js delete 用法(删除对象属性及变量)

js delete可以删除对象属性及变量，下面是一些示例，感兴趣的朋友可以看看

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

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