js create an object 2

 

<script type="text/javascript">

    function Person(username)
    {
        this.username = username

        if (typeof Person.flag == "undefined")
        {
            alert("START");

            Person.prototype.getInfo = function()
            {
                alert("Here: " + this.username);
            }

            Person.flag = true;
        }
    }

    var p1 = new Person("lisi");
    var p2 = new Person("gongzuo");

    p1.getInfo();
    p2.getInfo();

</script>