JS常用倒计时代码实例总结

时间：2021-05-26

本文实例总结了JS常用倒计时代码。分享给大家供大家参考，具体如下：

第一种：精确到秒的javascript倒计时代码

<form name="form1"><div align="center" align="center"><center>离2010年还有:<br><input type="textarea" name="left" size="35" style="text-align: center"></center></div></form><script LANGUAGE="javascript">startclock()var timerID = null;var timerRunning = false;function showtime() {Today = new Date();var NowHour = Today.getHours();var NowMinute = Today.getMinutes();var NowMonth = Today.getMonth();var NowDate = Today.getDate();var NowYear = Today.getYear();var NowSecond = Today.getSeconds();if (NowYear <2000)NowYear=1900+NowYear;Today = null;Hourleft = 23 - NowHourMinuteleft = 59 - NowMinuteSecondleft = 59 - NowSecondYearleft = 2009 - NowYearMonthleft = 12 - NowMonth - 1Dateleft = 31 - NowDateif (Secondleft<0){Secondleft=60+Secondleft;Minuteleft=Minuteleft-1;}if (Minuteleft<0){Minuteleft=60+Minuteleft;Hourleft=Hourleft-1;}if (Hourleft<0){Hourleft=24+Hourleft;Dateleft=Dateleft-1;}if (Dateleft<0){Dateleft=31+Dateleft;Monthleft=Monthleft-1;}if (Monthleft<0){Monthleft=12+Monthleft;Yearleft=Yearleft-1;}Temp=Yearleft+'年, '+Monthleft+'月, '+Dateleft+'天, '+Hourleft+'小时, '+Minuteleft+'分, '+Secondleft+'秒'document.form1.left.value=Temp;timerID = setTimeout("showtime()",1000);timerRunning = true;}var timerID = null;var timerRunning = false;function stopclock () {if(timerRunning)clearTimeout(timerID);timerRunning = false;}function startclock () {stopclock();showtime();}// --></script>

第二种：某某运动会

<!--倒计时Javascript begin--><script language="JavaScript"><!--function DigitalTime1(){var deadline= new Date("08/13/2007") //开幕倒计时var symbol="8月13日"var now = new Date()var diff = -480 - now.getTimezoneOffset() //是北京时间和当地时间的时间差var leave = (deadline.getTime() - now.getTime()) + diff*60000var day = Math.floor(leave / (1000 * 60 * 60 * 24))var hour = Math.floor(leave / (1000*3600)) - (day * 24)var minute = Math.floor(leave / (1000*60)) - (day * 24 *60) - (hour * 60)var second = Math.floor(leave / (1000)) - (day * 24 *60*60) - (hour * 60 * 60) - (minute*60)var deadline_2= new Date("08/13/2004") //开幕后计时var symbol_2="8月13日"var now_2 = new Date()var diff_2 = -480 - now.getTimezoneOffset() //是北京时间和当地时间的时间差var leave_2 = (now_2.getTime() - deadline_2.getTime()) + diff_2*60000var day_2 = Math.floor(leave_2 / (1000 * 60 * 60 * 24))var hour_2 = Math.floor(leave_2 / (1000*3600)) - (day_2 * 24)var minute_2 = Math.floor(leave_2 / (1000*60)) - (day_2 * 24 *60) - (hour_2 * 60)var second_2 = Math.floor(leave_2 / (1000)) - (day_2 * 24 *60*60) - (hour_2 * 60 * 60) - (minute_2*60)day=day+1;day_2=day_2+1;if (day>0) //还未开幕{//LiveClock1.innerHTML = "现在"+symbol+"天"LiveClock1.innerHTML = "<fontsetTimeout("DigitalTime1()",1000)}if (day<0) //已经开幕{//LiveClock1.innerHTML = "现在离"+symbol+"还有"+day+"天"+hour+"小时"+minute+"分"+second +"秒"LiveClock1.innerHTML = "<fontsetTimeout("DigitalTime1()",1000)}if (day==0) //正在开幕{//LiveClock1.innerHTML = "现在"+symbol+"天"LiveClock1.innerHTML = "<fontsetTimeout("DigitalTime1()",1000)}if (day<0 & day_2>19) //某某运动会结束{//LiveClock1.innerHTML = "现在离"+symbol+"还有"+day+"天"+hour+"小时"+minute+"分"+second +"秒"LiveClock1.innerHTML = "<fontsetTimeout("DigitalTime1()",1000)}}// --></script><!--倒计时Javascript end--><body onload=DigitalTime1()><div id= LiveClock1></div></body>

第三种：小时倒计时

<SCRIPT LANGUAGE="JavaScript"><!--var maxtime = 60*60 //一个小时，按秒计算，自己调整!function CountDown(){if(maxtime>=0){minutes = Math.floor(maxtime/60);seconds = Math.floor(maxtime%60);msg = "距离结束还有"+minutes+"分"+seconds+"秒";document.all["timer"].innerHTML=msg;if(maxtime == 5*60) alert('注意，还有5分钟!');--maxtime;}else{clearInterval(timer);alert("时间到，结束!");}}timer = setInterval("CountDown()",1000);//--></SCRIPT><div id="timer" style="color:red"></div>

第四种：最简倒计时

<Script Language="JavaScript"><!-- Beginvar timedate= new Date("January 14,2006");var times="研究生考试";var now = new Date();var date = timedate.getTime() - now.getTime();var time = Math.floor(date / (1000 * 60 * 60 * 24));if (time >= 0) ;document.write("<li><font color=#DEDBDE>现在离2006年"+times+"还有: <font color=#ffffff><b>"+time +"</b></font> 天</font></li>");// End --></Script>

第五种：最简倒计时二

<script language="JavaScript" type="text/javascript">function djs(){var urodz= new Date("11/12/2008");var now = new Date();var numvar ile = urodz.getTime() - now.getTime();var dni = Math.floor(ile / (1000 * 60 * 60 * 24));if (dni >1)num=dni+1else if (dni == 1)num=2else if (dni == 0)num=1else num=0document.write(num)}</script>距某某开幕式还有 [<script language="JavaScript" type="text/javascript">djs()</script>] 天

第五个：Javascript倒计时器 - 采用系统时间自校验

这次利用系统时间自校验倒计时, 无需手工调校使得倒计时更为精确, 代码及详细注释如下:

<span id="clock">00:01:11:00</span><input id="startB" type="button" value="start countdown!" onclick="run()"><input id="endB" type="button" value="stop countdown!" onclick="stop()"><br><input id="diff" type="text"><input id="next" type="text"><script language="Javascript">var normalelapse = 100;var nextelapse = normalelapse;var counter;var startTime;var start = clock.innerText;var finish = "00:00:00:00";var timer = null;// 开始运行function run() {startB.disabled = true;endB.disabled = false;counter = 0;// 初始化开始时间startTime = new Date().valueOf();// nextelapse是定时时间, 初始时为100毫秒// 注意setInterval函数: 时间逝去nextelapse(毫秒)后, onTimer才开始执行timer = window.setInterval("onTimer()", nextelapse);}// 停止运行function stop() {startB.disabled = false;endB.disabled = true;window.clearTimeout(timer);}window.onload = function() {endB.disabled = true;}// 倒计时函数function onTimer(){if (start == finish){window.clearInterval(timer);alert("time is up!");return;}var hms = new String(start).split(":");var ms = new Number(hms[3]);var s = new Number(hms[2]);var m = new Number(hms[1]);var h = new Number(hms[0]);ms -= 10;if (ms < 0){ms = 90;s -= 1;if (s < 0){ s = 59; m -= 1;}if (m < 0){ m = 59; h -= 1;}}var ms = ms < 10 ? ("0" + ms) : ms;var ss = s < 10 ? ("0" + s) : s;var sm = m < 10 ? ("0" + m) : m;var sh = h < 10 ? ("0" + h) : h;start = sh + ":" + sm + ":" + ss + ":" + ms;clock.innerText = start;// 清除上一次的定时器window.clearInterval(timer);// 自校验系统时间得到时间差, 并由此得到下次所启动的新定时器的时间nextelapsecounter++;var counterSecs = counter * 100;var elapseSecs = new Date().valueOf() - startTime;var diffSecs = counterSecs - elapseSecs;nextelapse = normalelapse + diffSecs;diff.value = counterSecs + "-" + elapseSecs + "=" + diffSecs;next.value = "nextelapse = " + nextelapse;if (nextelapse < 0) nextelapse = 0;// 启动新的定时器timer = window.setInterval("onTimer()", nextelapse);}</script>

PS：这里再为大家推荐几款时间及计时器相关工具供大家参考使用：

在线秒表工具：
http://tools.jb51.net/bianmin/miaobiao

Unix时间戳(timestamp)转换工具：
http://tools.jb51.net/code/unixtime

在线世界各地时间查询：
http://tools.jb51.net/zhuanhuanqi/worldtime

更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript时间与日期操作技巧总结》《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》

希望本文所述对大家JavaScript程序设计有所帮助。

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