实现前台时间与服务器时间同步

<script type="text/javascript">
    

    $(function () {
         @{ DateTime nowTime = System.DateTime.Now; }
                var currentDate = '@nowTime.ToString("yyyyMMdd  HH:mm:ss")';
                var currentYear = '@nowTime.Year';
                var currentMonth = '@nowTime.Month';
                var currentDay = '@nowTime.Day';
                var currentHour = '@nowTime.Hour';
                var currentMinute = '@nowTime.Minute';
                var currentSecond = '@nowTime.Second';

        var theFirstTime, theSecondTime;


        var calcTime = function () {
            if (parseInt(currentSecond) < 59) {
                currentSecond = parseInt(currentSecond) + 1;
            } else {
                currentSecond = "0";
                currentMinute = parseInt(currentMinute) + 1;    //分钟加一，秒钟置零
                if (parseInt(currentMinute) == 60) {
                    currentMinute = "0";
                    currentHour = parseInt(currentHour) + 1;    //小时加一，分钟置零
                    if (parseInt(currentHour) == 24) {
                        currentHour = "0";
                        currentDay = parseInt(currentDay) + 1;      //日期加一，小时置零
                        var tempMonth = parseInt(currentMonth);
                        if (parseInt(tempMonth) == 1 || parseInt(tempMonth) == 3 || parseInt(tempMonth) == 5 || parseInt(tempMonth) == 7 || parseInt(tempMonth) == 8 || parseInt(tempMonth) == 10 || parseInt(tempMonth) == 12) {     //大月
                            if (parseInt(currentDay) > 31) {
                                currentDay = "1";
                                currentMonth = parseInt(currentMonth) + 1;      //月份加一，日期置零
                                if (parseInt(currentMonth) > 12) {
                                    currentMonth = "1";
                                    currentYear = parseInt(currentYear) + 1;        //年份加一，月份置零
                                }
                            }
                        } else {        //小月
                            if (parseInt(currentMonth) == 2) { //二月
                                if ((parseInt(currentYear) % 4 == 0 && parseInt(currentYear) % 100 != 0) || (parseInt(currentYear) % 400 == 0)) { //是润年
                                    if (parseInt(currentDay) > 29) {
                                        currentDay = "1";
                                        currentMonth = parseInt(currentMonth) + 1;
                                    }
                                } else { //非润年
                                    if (parseInt(currentDay) > 28) {
                                        currentDay = "1";
                                        currentMonth = parseInt(currentMonth) + 1;
                                    }
                                }
                            } else {    //非二月
                                if (parseInt(currentDay) > 30) {
                                    currentDay = "1";
                                    currentMonth = parseInt(currentMonth) + 1;
                                }
                            }
                        }
                    }
                }
            }
        }

        setInterval(function () {
            calcTime();
            theFirstTime = currentYear + "-" + (parseInt(currentMonth) < 10 ? ("0" + currentMonth.toString()) : currentMonth.toString()) + "-" + (parseInt(currentDay) < 10 ? ("0" + currentDay.toString()) : currentDay.toString());     //年月日   20130530
            theSecondTime = (parseInt(currentHour) < 10 ? ("0" + currentHour.toString()) : currentHour.toString()) + ":" + (parseInt(currentMinute) < 10 ? ("0" + currentMinute.toString()) : currentMinute.toString()) + ":" + (parseInt(currentSecond) < 10 ? ("0" + currentSecond.toString()) : currentSecond.toString());    //时分秒   15:17:23
            $("#time").html(theFirstTime);
            
            if (parseInt(theSecondTime.split(':')[0]) > 12 || parseInt(theSecondTime.split(':')[0]) == 12) {
                $("#timem").html("" + theSecondTime + "&nbspPM");
            } else {
                $("#timem").html("" + theSecondTime + "&nbspAM");
            }
                   
                    $("#systemTime").val(theFirstTime + " " + theSecondTime);
                }, 1000);

                //setInterval(function () {
                //    $.ajax({
                //        type: "post",
                //        url: "/Help/GetTime",
                //        cache: false,
                //        data: {},
                //        success: function (output) {
                //            if (output == "" || output == undefined) {
                //                return;
                //            } else {
                //                var value = new Date(parseInt(output.replace("/Date(", "").replace(")/", ""), 10));
                //                value = new Date(parseInt(output.substr(6)));
                //                var value0 = value.format("yyyy-MM-dd");
                //                var value1 = value.format("hh:mm:ss");
                //                $("#systemTime").val(value0 + " " + value1);
                //                theFirstTime = value0;
                //                theSecondTime = value1;
                //                $("#time").html(theFirstTime);
                //                if (parseInt(theSecondTime.split(':')[0]) > 12 || parseInt(theSecondTime.split(':')[0]) == 12) {
                //                    $("#timem").html("" + theSecondTime + "&nbspPM");
                //                } else {
                //                    $("#timem").html("" + theSecondTime + "&nbspAM");
                //                }
                //            }
                //        },
                //    });
                //}, 90000);
            });
    </script>