delete删除对象属性

对象属性删除

var person={
	name:"张三",
	age:28
}
console.log(person.name);//张三
delete person.name;
console.log(person.name);//undefined

注意：直接用delete删除不了变量

var name="李四"
delete name;
console.log(name);//李四

删除不了原型链中的变量

function fun() {
	this.name = 'mm';
}
var obj = new fun();
fun.prototype.age = 18;
delete obj.age;
console.log(obj.age) //18