html ajax请求 php 下拉 加载更多数据 （也可点击按钮加载更多）

<input type="hidden" class="total_num" id="total" value="{$total}">
<div class="diy-richtext messagebox" style="padding-top:10px;">
    {loop $messagelist $k $v}
        <div class="message" rel='{$k}'>
            <p class="message_icon"><img width="21" alt="" height="20" style="width: 20px; height: 20px;" src="../addons/ewei_shopv2/static/img/icon{$v['cateid']}.png" data-lazyloaded="true"></p>
            <p class="message_cate" >&nbsp;&nbsp;{$v['cate_name']}</p>
            <p class="message_title" >{$v['title']}
            <span class="message_time" >{php echo date('Y-m-d H:i:s',$v['createtime']);}</span><br>
            <p >{$v['detail']}<br>
            </p><p><br>
            </p>
        </div>
    {/loop}
</div><div class="fui-picturew row-4" onclick="getmore()" >加载更多..</div>

   $(function() {       $(window).scroll(function(){
            var scrollTop = $(this).scrollTop();    //滚动条距离顶部的高度
            var scrollHeight = $(document).height();   //当前页面的总高度
            var clientHeight = $(this).height();    //当前可视的页面高度            if(scrollTop + clientHeight >= scrollHeight){   //距离顶部+当前高度 >=文档总高度 即代表滑动到底部 count++;         //每次滑动count加1
             //   filterData(serviceTypeId,industryId,cityId,count); //调用筛选方法，count为当前分页数
                getmore();
            }
       });    });     function getmore(){            var total = $('#total').val()
            FoxUI.loader.show('mini');
            var data = {'classid': "{$classitem['id']}", 'merchid': "{$item['id']}", 'k': total};
            $.ajax({
                url: "{php echo mobileUrl('shop/category/getmoreMessage')}",
                data: data,
                cache: false
            }).done(function (result) {
                var data = jQuery.parseJSON(result);
                FoxUI.loader.hide();
                if (data.status == 1) {
                    if(data.result.code == 1){
                           $('.messagebox').append(data.result.html);
                       $('#total').val(data.result.total);
                    }else if(data.result.code == 2){
                        FoxUI.toast.show ('暂无更多')
                    }                } else {
                    alert("微信接口繁忙,请稍后再试!");                }
            });
    }                

    public function main()//显示页面
    {
        global $_W;        $total = 6;//默认加载条数
        $limit = " limit 0,$total";
        $messagelist = pdo_fetchall('SELECT * FROM ' . tablename('ewei_shop_merch_message').'where displayorder = :displayorder order by id desc'.$limit, array(':displayorder'=>0));             // var_dump($messagelist);exit;
        include $this->template();
    }
    public function getmoreMessage()//ajax下拉页面
    {
        global $_W;
        global $_GPC;        $rel = isset($_GPC['k'])?$_GPC['k']:0;
        $where = "1" ;
        $offset = $rel;
        $offnum = 4;
        $where .= " order by id desc" ;
        $where .= " limit $offset,$offnum" ;
        $total = $offset + $offnum;
        $list = pdo_fetchall('SELECT * FROM ' . tablename('ewei_shop_merch_message') . ' WHERE '.$where);
        $html = '';
        foreach ($list as $k => $v) {
            $cateid = $v['cateid'];
            $html.='<div class="message" rel="'.$k.'">
                <p class="message_icon"><img width="21" alt="" height="20" style="width: 20px; height: 20px;" src="../addons/ewei_shopv2/static/img/icon'.$cateid.'.png" data-lazyloaded="true"></p>
                <p class="message_cate" >&nbsp;&nbsp;'.$v['cate_name'].'</p>
                <p class="message_title" >'.$v['title'].'
                <span class="message_time" >'.date('Y-m-d H:i:s',$v['createtime']).'</span><br>
                <p >'.$v['detail'].'<br>
                </p><p><br>
                </p>
            </div>';
        }        if($list){
              $arr = array('code' => 1, 'msg' => '','html'=>$html,'total'=>$total);
            show_json(1, $arr);
        }else{
               $arr = array('code' => 2, 'msg' => '暂无更多.',);
            show_json(1, $arr);
        }
    }   

public function getmoreMessage()//ajax下拉页面
{
global $_W;
global $_GPC;

$rel = isset($_GPC[‘k’])?$_GPC[‘k’]:0;
$where = “1” ;
$offset = $rel;
$offnum = 4;
$where .= ” order by id desc” ;
$where .= ” limit $offset,$offnum” ;
$total = $offset + $offnum;
$list = pdo_fetchall(‘SELECT * FROM ‘ . tablename(‘ewei_shop_merch_message’) . ‘ WHERE ‘.$where);
$html = ”;
foreach ($list as $k => $v) {
$cateid = $v[‘cateid’];
$html.='<div class=”message” rel=”‘.$k.'”>
<p class=”message_icon”><img width=”21″ alt=”” height=”20″ style=”width: 20px; height: 20px;” src=”../addons/ewei_shopv2/static/img/icon’.$cateid.’.png” data-lazyloaded=”true”></p>
<p class=”message_cate” >&nbsp;&nbsp;’.$v[‘cate_name’].'</p>
<p class=”message_title” >’.$v[‘title’].’
<span class=”message_time” >’.date(‘Y-m-d H:i:s’,$v[‘createtime’]).'</span><br>
<p >’.$v[‘detail’].'<br>
</p><p><br>
</p>
</div>’;
}

if($list){
$arr = array(‘code’ => 1, ‘msg’ => ”,’html’=>$html,’total’=>$total);
show_json(1, $arr);
}else{
$arr = array(‘code’ => 2, ‘msg’ => ‘暂无更多.’,);
show_json(1, $arr);
}
}