用js代码在页面显示倒计时的方法

不废话直接上代码

<script language="javascript">
                    //倒计时
                    var interval = 1000;
                    var nowserver = new Date('@DateTime.Now.ToString()');//服务器时间
                    var now = new Date();//客户端时间
                    var datediff = nowserver.getTime() - now.getTime();//server-client时间差
                    //alert(datediff);

                    var endDate = new Date('@DateTime.Now.AddMinutes(10).ToString()');//不动 注意这里@DateTime.Now.AddMinutes(10).ToString()是.NET代码

                    //重新发送的方法
    //function payverify() {
    //    $.post('/RetailSales/PayVerify', { orderno: "@Model.OrderNumber", orderid: "@Model.OrdersId", paypwd: $('#paypwd').val() }, function (data) {
     //       $('#buttompay').html(data);
//
     //   });
   // }

                    function ShowCountDown(divname) {
                        now = new Date();//客户端时间，是反复要变的
                        var leftTime = endDate.getTime() - now.getTime() + datediff;//修复时间差
                        var cc = document.getElementById(divname);
                        if (leftTime > 0) {
                            var leftsecond = parseInt(leftTime / 1000);
                            var day1 = Math.floor(leftsecond / (60 * 60 * 24));
                            var hour = Math.floor((leftsecond - day1 * 24 * 60 * 60) / 3600);
                            var minute = Math.floor((leftsecond - day1 * 24 * 60 * 60 - hour * 3600) / 60);
                            var second = Math.floor(leftsecond - day1 * 24 * 60 * 60 - hour * 3600 - minute * 60);
                            try {
                                var cc = document.getElementById(divname);
                                if (minute == 0 && second == 0) {
                                    cc.innerHTML = "0分0秒";
                                    document.getElementById('msg').innerHTML = "信息：<font color=red>短信验证超时，请重新获取短信验证码！<span>";
                                    window.clearInterval(intervalId);//停止计时
                                    return;
                                }
                                cc.innerHTML = minute + "分" + second + "秒";
                            } catch (e) { }
                        }
                        else {
                            cc.innerHTML = "0分0秒";
                            document.getElementById('msg').innerHTML = "信息：<font color=red>短信验证超时，请重新获取短信验证码！<span>";
                            window.clearInterval(intervalId);//停止计时
                        }
                    }
                    var intervalId = window.setInterval(function () { ShowCountDown('t'); }, interval);
                </script>