//這就是繼承了

(function (windows, undefined) {

    //父類

    function Person() { }

    Person.prototype.name = "name in Person";

    Person.prototype.learning = function () {

        alert("learning in Person")

    }

    //子類

    function Student() { }

    Student.prototype = new Person();           //修復原型

    Student.prototype.constructor = Student;    //建構函式
 

    Student.prototype.supr = Person.prototype;  //父類

    Student.prototype.learning = function () {

        alert("learning in Student");

    }

    //工人

    function Worker() { }

    Worker.prototype = new Person();           //修復原型

    Worker.prototype.constructor = Worker;    //建構函式

    Worker.prototype.supr = Person.prototype;  //父類
 

    Worker.prototype.learning = function () {

        alert("learning in Worker");

    }

    //工廠

    var personFactory = function (type) {

        switch (type) {

            case "Worker":

                return new Worker();

                break;

            case "Student":

                return
 
 new Student();

                break;

        }

        return new Person();

    }

    //客戶端

    var person = personFactory("Student");

    person.learning(); //learning in Student

    person = personFactory("Worker");

    person.learning(); //learning in Worker

})(window, undefined);