JS实现简单的倒计时

article/2025/11/4 19:19:32

1、第一种

<!DOCTYPE html><html><head><meta charset="utf-8"><title>www.jb51.net JS倒计时</title></head><body><div id="div"></div><script type="text/javascript">window.onload=clock;function clock(){var today=new Date(),//当前时间h=today.getHours(),m=today.getMinutes(),s=today.getSeconds();var stopTime=new Date("Feb 9 2019 00:00:00"),//结束时间stopH=stopTime.getHours(),stopM=stopTime.getMinutes(),stopS=stopTime.getSeconds();var shenyu=stopTime.getTime()-today.getTime(),//倒计时毫秒数shengyuD=parseInt(shenyu/(60*60*24*1000)),//转换为天D=parseInt(shenyu)-parseInt(shengyuD*60*60*24*1000),//除去天的毫秒数shengyuH=parseInt(D/(60*60*1000)),//除去天的毫秒数转换成小时H=D-shengyuH*60*60*1000,//除去天、小时的毫秒数shengyuM=parseInt(H/(60*1000)),//除去天的毫秒数转换成分钟M=H-shengyuM*60*1000;//除去天、小时、分的毫秒数S=parseInt((shenyu-shengyuD*60*60*24*1000-shengyuH*60*60*1000-shengyuM*60*1000)/1000)//除去天、小时、分的毫秒数转化为秒document.getElementById("div").innerHTML=(shengyuD+"天"+shengyuH+"小时"+shengyuM+"分"+S+"秒"+"<br>");// setTimeout("clock()",500);setTimeout(clock,500);}</script></body></html>

运行效果：

2、第二种

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>www.jb51.net js倒计时</title><style>*{margin: 0;padding:0;}p {font-size: 80px;text-align: center;}p span {color: red;}p span.time {color: black}body{padding-top:200px;}</style></head><body><p>距离2019年还有</p><p><span></span></p><script>var oSpan = document.getElementsByTagName('span')[0];function tow(n) {return n >= 0 && n < 10 ? '0' + n : '' + n;}function getDate() {var oDate = new Date();//获取日期对象var oldTime = oDate.getTime();//现在距离1970年的毫秒数var newDate = new Date('2019/1/1 00:00:00');var newTime = newDate.getTime();//2019年距离1970年的毫秒数var second = Math.floor((newTime - oldTime) / 1000);//未来时间距离现在的秒数var day = Math.floor(second / 86400);//整数部分代表的是天；一天有24*60*60=86400秒 ；second = second % 86400;//余数代表剩下的秒数；var hour = Math.floor(second / 3600);//整数部分代表小时；second %= 3600; //余数代表 剩下的秒数；var minute = Math.floor(second / 60);second %= 60;var str = tow(day) + '<span class="time">天</span>'+ tow(hour) + '<span class="time">小时</span>'+ tow(minute) + '<span class="time">分钟</span>'+ tow(second) + '<span class="time">秒</span>';oSpan.innerHTML = str;}getDate();setInterval(getDate, 1000);</script></body></html>

运行效果：