thinkphp+ajax局部刷新点赞

public function zan(){
        $data['id']=isset($_POST['id'])?intval(trim($_POST['id'])):0;
        $obj = M("Article");
 
        if(!isset($_COOKIE[$_POST['id']+10000])&&$obj->where($data)->setInc('zan')){
            $cookiename = $_POST['id']+10000;
            setcookie($cookiename,40,time()+60,'/'); 
 
            $data['info'] = "ok";
            $data['status'] = 1;
            $this->ajaxReturn($data);
             
            exit();
        }else{
            $data['info'] = "fail";
            $data['status'] = 0;
            $this->ajaxReturn($data);
            exit();
        }
         
    }

$(".z").on('click',function(){
        var Oa=$(this);
        var id=Oa.attr('id');//获取id属性
        var vl=Oa.find("span").text();
            vl=parseInt(vl)+1;
        $.post('__CONTROLLER__/zan',{id:id},function(data){
            if(data.status==1){ 
                alert('感谢您的支持！');//模拟异步数据加1
                Oa.find("span").text(vl);//页面元素加1
            }else{
                alert('您已经点过赞了,不要重复哦！');
            }
        },'json'); 
    })

<a class="z" id="<{$list.id}>" href="javascript:void(0);">赞<span><{$list.zan}></span></a>