本文实例为大家分享了js实现指定时间倒计时的具体代码，供大家参考，具体内容如下
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>计时</title>
</head>
<body>
<div style="display: flex; justify-content: center; align-items: center;">
<span>从2019年6月31日至今：</span>
<span id="timeid1" style="font-size:35px"></span>天
<span id="timeid2" style="font-size:35px"></span>小时
<span id="timeid3" style="font-size:35px"></span>分
<span id="timeid4" style="font-size:35px"></span>秒
</div>
<script type="text/javascript">
function loveTime() {
var the=new Date(2019,6,31)
var date = new Date() - the
var days = Math.floor(date / 1000 / 60 / 60 / 24) // 从这里开始
var daysmod = date - days * 24 *60 * 60 * 1000
var hours = Math.floor(daysmod / 1000 / 60 / 60)
var hoursmod = date - (days * 24 *60 * 60 * 1000) - (hours * 1000 * 60 * 60)
var minutes = Math.floor(hoursmod / 1000 / 60)
var minutesmod = date - (days * 24 *60 * 60 * 1000) - (hours * 1000 * 60 * 60) - (minutes * 1000 * 60)
var seconds = Math.floor(minutesmod / 1000) // 到这里结束，是将总毫秒转化成对应天数+小时数+分钟数+秒数的转换方法
var daysshow = document.getElementById("timdid1");
var ds = document.getElementById("timeid1");
var hs = document.getElementById("timeid2");
var ms = document.getElementById("timeid3");
var ss = document.getElementById("timeid4");
ds.innerHTML = days;
hs.innerHTML = hours;
ms.innerHTML = minutes;
ss.innerHTML = seconds;
}
// 使用定时器实现每一秒写一次时间
setInterval("loveTime();",1000);
</script>
</body>
</html>
更多关于倒计时的文章请查看专题：《倒计时功能》
更多JavaScript时钟特效点击查看：JavaScript时钟特效专题
