ajax 轮询请求后台服务器

<script type="text/javascript">
          
         // var i=0; //声明轮询次数变量
    $(document).ready(function(){  
  c = window.setInterval("getResult()",10000); //间隔多少秒去触发ajax
  });
 
  function getResult(){
   $.ajax({
           type:'get',
            url:'/index/index/polling',
            dataType:'json',
            async: true,
            success:function(data){
//                   i++; //记录轮询的次数  
                if(data.msg == {$count}){ //处理本身的业务
                   // window.location.href = '/';
                }else{
                    window.location.href = '/';
            }
          //设置轮询了多少次中止轮询
//                 if(i>6){
//                window.clearInterval(c); 
//                 }
            }
        });
  }
  </script>