function User(name,age) {
var year = (new Date()).getFullYear() - age;
this.getYearBorn = function () {//创建一个特权方法,能够访问到year变量,同时自身属于公共可访问的
return year;
}
}
var user = new User('angela', 1989);
alert(user.getYearBorn() == 26);