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
