<script type="text/javascript">
        function Person(){
            this.username = new Array();
            this.password = "xero2010";
        }

        Person.prototype.getInfo = function getInfo(){
            document.write(this.username+","+this.password);
        }

        var person1 = new Person();
        var person2 = new Person();

        //不共享属性，互不影响
        person1.username.push("Wilson");
        person2.username.push("Alex");

        person1.getInfo();
        person2.getInfo();
    </script>