var LazyLoad = Class.create({
            initialize:function(elements,callback){
                this.elem = elements;
                this.cb = callback;
                this.show();
            },
            show : function(){
                this.cb(this.elem);
            }

        });

        var lz = new LazyLoad('abc',function(elem){
            alert(elem);
        });
        //对object的prototype进行extend,参数二使用Module Pattern ^_^
        Object.extend(LazyLoad.prototype,(function(){
            function display(){
                alert(this.elem);
            }
            return {
                display:display,
                dd:display//实现别名的功能^_^
            }
        })());

        var lz2 = new LazyLoad('cbd',function(elem){
            alert(elem);
        });
        lz2.display();
        lz2.dd();