更新一下时间倒计时插件（jQUery）
1 $.fn.genTimer = function (e) {
2 function u(e) {
3 var t = Math.floor(e / n),
4 r = Math.floor((e - t * n) / 36e5),
5 i = Math.floor((e - t * n - r * 1e3 * 60 * 60) / 6e4),
6 s = Math.floor((e - t * n - r * 1e3 * 60 * 60 - i * 1e3 * 60) / 1e3);
7 return {
8 hours: ("0" + r).slice(-2),
9 minutes: ("0" + i).slice(-2),
10 seconds: ("0" + s).slice(-2),
11 dates: t
12 }
13 }
14 if (this.data("handled")) return this;
15 this.data("handled", !0);
16 var t = {
17 beginTime: new Date,
18 day_label: "day",
19 days_label: "days",
20 unitWord: {
21 hours: ":",
22 minutes: ":",
23 seconds: ""
24 },
25 type: "",
26 callbackOnlyDatas: !1
27 },
28 n = 864e5,
29 r = $.extend({}, t, e),
30 i = this;
31 r.targetTime = r.targetTime.replace(/\-/g, "/");
32 r.targetTime = isNaN(r.targetTime) ? r.targetTime : parseInt(r.targetTime);37 var s = new Date(r.targetTime) - new Date(r.beginTime),
38 o = function () {
39 if (s < 0) {
40 r.callback.call(i, r.callbackOnlyDatas ? {
41 hours: "00",
42 minutes: "00",
43 seconds: "00",
44 dates: 0
45 } : "00" + r.unitWord.hours + "00" + r.unitWord.minutes + "00");
46 clearInterval(i.interval)
47 } else {
48 var e = u(s);
49 if (r.callbackOnlyDatas) r.callback.call(i, e);
50 else if (r.type == "day") {
51 s >= n * 2 ?
52 r.callback.call(i, '<span class="day_count">' + e.dates + '</span><span class="day">' + r.days_label + '</span><span class="day_seconds">' + e.hours + r.unitWord.hours + e.minutes + r.unitWord.minutes + e.seconds + r.unitWord.seconds + "</span>")
53 : (
54 s >= n ?
55 r.callback.call(i, '<span class="day_count">' + e.dates + '</span><span class="day">' + r.day_label + '</span><span class="day_seconds">' + e.hours + r.unitWord.hours + e.minutes + r.unitWord.minutes + e.seconds + r.unitWord.seconds + "</span>")
56 : r.callback.call(i, '<span class="seconds">' + e.hours + r.unitWord.hours + e.minutes + r.unitWord.minutes + e.seconds + r.unitWord.seconds + "</span>")
57 );
58 }
59 else if (r.type == "diffNoDay") {
60 var t = e.hours;
61 s >= n && (t = Number(e.dates * 24) + Number(e.hours));
62 r.callback.call(i, '<span class="hours">' + t + '</span><span class="miniutes">' + r.unitWord.hours + e.minutes + '</span><span class="senconds">' + r.unitWord.minutes + e.seconds + r.unitWord.seconds + "</span>")
63 } else {
64 var t = e.hours;
65 s >= n && (t = Number(e.dates * 24) + Number(e.hours));
66 r.callback.call(i, '<span class="seconds">' + t + r.unitWord.hours + e.minutes + r.unitWord.minutes + e.seconds + r.unitWord.seconds + "</span>")
67 }
68 }
69 s -= 1e3
70 };
71 i.interval = setInterval(o, 1e3);
72 o();
73 return this
74 };
调用：
1 $(this).genTimer({
2 beginTime: new Date(),//开始时间
3 targetTime: new Date(),//结束时间
4 type: "day",
5 callback: function (e) {
6 this.html(e)
7 }
8 })
附加：一个C#获取现在到1970-1-1毫秒算法
1 string times = (DateTime.Now.Subtract(DateTime.Parse("1970-1-1")).TotalMilliseconds - (8 * 60 * 60 * 1000)).ToString("F0");
来源：https://www.cnblogs.com/baily/archive/2012/04/11/2442353.html