ajax 轮询查询数据

 $(function(){             setTimeout(function(){payfind();},5000);        });        function payfind(){            $.ajax({url:"{newe:U('payfind',array('keysn'=>$arr['ckey']))}",async:true,dataType:"JSON",type:"POST",data:{},success: function(data){             if(data.str==1){                  onloading(data.url);             }else if(data.str==2){                  onloading(window.location.href);             }else{                 setTimeout(function(){payfind();},1000);             }          }});        }