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<!DOCTYPE html>
<html dir="ltr">
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
#box{
width: 500px;
height: 100px;
margin: 200px auto;
background: #3AD900;
text-align: center;
line-height: 100px;
}
#sp{
width: 212.44px;
height: 21px;
}
</style>
</head>
<script type="text/javascript" src="jquery-3.3.1.js"></script>
<body>
<div id="box">清明倒计时：
<span>2天14小时37分钟35秒000毫秒</span>
</div>
<script>
$(function(){
function time(){
var d=Date.parse('Apr 05,2019');
var date=new Date()
var dd=date.getTime();
var rd=Math.floor((d-dd)/1000);
var days=Math.floor(rd/86400);
var hours=Math.floor(rd%86400/3600);
var minus=Math.floor(rd%3600/60);
var secos=Math.floor(rd%60);
var hm=Math.floor((d-dd)%1000);
if(hm<100){
if(hm<10){
hm="00"+hm;
}else{
hm="0"+hm;
}
}
$('span').text(days+'天'+hours+'小时'+minus+'分钟'+secos+'秒'+hm+"毫秒");
}
setInterval(time,1)
})
</script>
</body>
</html