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//基本类型
    var name = "michael";
    var name2 = name;
    name2 = "jack";
    print(name);
    //输出结果 michael
    //引用类型
    function Person(){
    }
    var person = new Person();
    person.name="michael";
    var person2 = person;
    person2.name="jack";
    person2.age=20;
    print(person.name);
    print(person.age);
    //输出结果 jack
    var person3 = new Person();
    person3.name="lucy";
    function print(msg){
        document.write(msg);
        document.write("<br>");
    }