对象中的constructor

function Person(name, age, gender, car){            this.name = name;            this.age = age;            this.gender = gender;            this.car = car;        }        var x = {            brand:"byd"        };        var p = new Person("张学友","18","male",x);        var p1 = new p.constructor("张学友1","19","male",x);//相当于直接使用 new Person()        console.log(p1);        //原型对象在创建出来的时候，会默认的有一个constructor属性        //指向对应的构造函数//        var o = Person.prototype;//        Person.prototype.constructor