ajax 輪詢請求後臺服務器

<script type="text/javascript">
          
         // var i=0; //聲明輪詢次數變量
    $(document).ready(function(){  
  c = window.setInterval("getResult()",10000); //間隔多少秒去觸發ajax
  });
 
  function getResult(){
   $.ajax({
           type:'get',
            url:'/index/index/polling',
            dataType:'json',
            async: true,
            success:function(data){
//                   i++; //記錄輪詢的次數  
                if(data.msg == {$count}){ //處理本身的業務
                   // window.location.href = '/';
                }else{
                    window.location.href = '/';
            }
          //設置輪詢了多少次中止輪詢
//                 if(i>6){
//                window.clearInterval(c); 
//                 }
            }
        });
  }
  </script>