1,對象屬性刪除
function fun(){
this.name = 'mm';
}
var obj = new fun();
console.log(obj.name);//mm
delete 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
