<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>放假倒计时</title>
</head>
<body>
<p>现在距离2020年国庆节还有<span></span>!</p>
<script>
var span=document.getElementsByTagName("span")[0];
var holiday = new Date('2020/10/1');
var day;
var hour;
var min;
var sec;
setInterval(function () {
var now = new Date();
var long = holiday.getTime()-now.getTime();
sec=parseInt(long/1000%60);
min=parseInt(long/1000%3600/60);
hour=parseInt(long/1000%(3600*24)/3600);
day=parseInt(long/1000/60/60/24);
span.innerHTML=day+"天"+hour+"时"+min+"分"+sec+"秒";
},1000)
</script>
</body>
</html>