模块表单（表单名为fankui）如何写瀑布流？下面的代码没成功

   <script>
    var Mpage=1;
    //滚动显示更多
    var scroll_get = true;  //做个标志,不要反反复复的加载
    $(document).ready(function () {
        $(window).scroll(function () {
            if (scroll_get==true &&  (400 + $(window).scrollTop())>($(document).height() - $(window).height())) {
                scroll_get = false;
                layer.msg('内容加载中,请稍候...',{time:1000});
                dr_ajax_load_more();
            }
        });
    });

    function dr_ajax_load_more(){
        Mpage++;
        $.get('/index.php?s=api&c=api&m=template&name=fankui_list_data.html&module={MOD_DIR}&catid={$catid}&format=json&page='+Mpage+'&'+Math.random(),function(res){
            $('.footer-cont').hide();
            if(res.code==1){
                if(res.msg==''){
                    $('#is_ajax_btn').hide();
                    layer.msg("已经显示完了",{time:500});
                }else{
                    $('#content_list').append(res.msg);
                    scroll_get = true;
                }
            }else{
                layer.msg(res.msg,{time:2500});
            }
        }, 'json');
    }
</script>