JavaScript中的构造函数

	function Person(name, age) {
        this.name = name;
        this.age = age;
    }

    var p = Person('jerry',20);
    var p1 = new Person('justin',39);
    //直接调用构造函数并没有直接返回任何(返回的是undefined), 必须用new创建函数对象
    console.log(typeof p);
    console.log(typeof p1);

    var pp = Person('jerry',20);
    var pp1 = Person('justin',39);
    console.log(pp === pp1); //true  因为构造函数返回的都是undefined