php custom sorting

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html Page

<td class="textcenter">
                  <input type="text" name="cat[order]" value="{$vo.order}" class="hy_input orders" orderid="{$vo.cat_id}" style="width:50px;" />
          </td>
js 页面
<script type="text/javascript">
     $(".orders").change(function(){
             var orderid = $(this).attr(&#39;orderid&#39;);
             var ordernum = $(this).val();
             $.post("{:U(&#39;Image/listorder&#39;)}",{"orderid":orderid,"ordernum":ordernum},function(data){
                      if(data.code==1000){
                           location.replace(location); 
                      }else{
                         alert(data.msg);
                      }
             },"json");          
     });
</script>

php page:

/**
	 * 排序操作
	 */
	public function listorder(){
         if(IS_POST){
                $orderid = I("post.orderid",'','intval');
                $ordernum = I("post.ordernum",'','intval');
                if(empty($orderid)){
                    $ini=array(
                          'code'=>222,
                          'msg'=>'id不合法'
                    );
                    $this->ajaxReturn($ini);
                }
                $listresult = M('Cat')->where("cat_id={$orderid} and status=0")->find();
                if(empty($orderid)){
					$ini=array(
                          'code'=>223,
                          'msg'=>'id已失效'
                    );
                    $this->ajaxReturn($ini);
                }
                $arr =array();
                $arr['order']  = $ordernum;
                $result = M('Cat')->where("cat_id={$orderid}")->save($arr);
                if($result){
                    $ini=array(
                          'code'=>1000,
                          'msg'=>'操作成功'
                    );
                }else{
					$ini=array(
                          'code'=>224,
                          'msg'=>'操作失败'
                    );
                }
                $this->ajaxReturn($ini);
         }
	}

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