//基本類型

    var name = "michael";
    var name2 = name;
    name2 = "jack";

    print(name);
    //輸出結果 michael



    //引用類型
    function Person(){

    }
    var person = new Person();
    person.name="michael";
    var person2 = person;
    person2.name="jack";
    person2.age=20;

    print(person.name);
    print(person.age);
    //輸出結果 jack


    var person3 = new Person();
    person3.name="lucy";

    function print(msg){
        document.write(msg);
        document.write("<br>");
    }