javascript保存类实例

<script>
    function MyObj(name, instancename) {
        if (MyObj.instances[instancename]) instancename += '_1';//如果重名则重新命名实例名称
        MyObj.instances[instancename] = this;
        this.name = name;
        this.showwho = function () { alert(this.name); }
    }
    MyObj.instances = {};
    new MyObj("showbo",'i1');
    new MyObj("web", 'i1');//这个重名了，会重新命名为i1_1
    new MyObj("web开发网", 'i3');


    MyObj.instances['i1'].showwho()
    MyObj.instances['i1_1'].showwho()
    MyObj.instances['i3'].showwho()
</script>