$(function () {
            setInterval(GetWxPayResult, 2000);
            function GetWxPayResult() {
                var no = $("#tradeno").text();
                $.ajax({
                    url: "/StudentIndex/WxPayResult",
                    type: "post",
                    data: {
                        idcard: '@ViewBag.idcard',
                        tradeno:no,
                    },
                    success: function (json) {
                        if (json.result) {
                            document.location.href = "/StudentIndex/WxPayisOK?idcard=@ViewBag.idcard"+"&&tradeno="+no;
                        }
                        else {
                        }
                    },
                    error: function (json) {
                        alert("错误");
                    }
                })
            }
        })

        //ajax轮询支付结果
        public ActionResult WxPayResult(string idcard, string tradeno)
        {
            object data = "";
            StudentModel studentModel = context.studentModel.FirstOrDefault(x => x.identityCard == idcard);
            PayModel model = context.payModel.FirstOrDefault(x => x.studentid == studentModel.candidateNum);
            if (model != null)
            {
                data = new { result = true };
            }
            return Json(data);
        }

        //支付完成
        public ActionResult WxPayisOK(string idcard, string tradeno)
        {
            StudentModel studentModel = context.studentModel.FirstOrDefault(x => x.identityCard == idcard);
            PayModel model = context.payModel.FirstOrDefault(x => x.studentid == studentModel.candidateNum);

            if (model != null)
            {
                return Content("<Script>alert('缴费成功！');window.location.href='/StudentIndex/StudentIndex';</Script>");
            }
            else
            {
                return Content("<Script>alert('缴费失败！请保留好支付凭证前往缴费处申请退款');window.location.href='/StudentIndex/StudentIndex';</Script>");
            }
        }