js delete 用法(刪除對象屬性及變量)

1,對象屬性刪除

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

2,變量刪除

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

直接用delelte刪除不了變量

3,刪除不了原型鏈中的變量

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