<input type="hidden"  id="order_id"  value="<?php echo $order_id;?>">
<script type="text/javascript">
function pay_status(){
   var order_id = $("#order_id").val();
   $.ajax({  
    url:'http://' + window.location.host+ '/home/cart/pay_status_check',
    dataType:'json', 
    type:'post',  
    data:{'order_id':order_id}, 
    success:function(data){  
      if(data == '1' ){
        window.clearInterval(int); //销毁定时器
        setTimeout(function(){
          //跳转到结果页面，并传递状态
          window.location.href="http://" rel="external nofollow" rel="external nofollow" +window.location.host+"/home/cart/pay_result?pay_status=success";
        },1000)
        
      }else if(data =='2'){
        window.clearInterval(int); //销毁定时器
        setTimeout(function(){
          //跳转到结果页面，并传递状态
          window.location.href="http://" rel="external nofollow" rel="external nofollow" +window.location.host+"/home/cart/pay_result?pay_status=fail";
        },1000)
      }
    }, 
    error:function(){  
      alert("error");
      
    },  

 });
}
//启动定时器
var int=self.setInterval(function(){pay_status()},1000);
</script>

//支付状态检测
  public function pay_status_check(){
    $order_id = I("order_id");
    $result = M('table')->where("order_id = $order_id")->find();
    echo $result['pay_status'];
  }