<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<script crossorigin="anonymous" integrity="sha384-6ePHh72Rl3hKio4HiJ841psfsRJveeS+aLoaEf3BWfS+gTF0XdAqku2ka8VddikM"
src="https://lib.baomitu.com/jquery/1.11.3/jquery.min.js"></script>
<title>最简单的天数时分秒倒计时</title>
<style>
#day,#hours,#minutes,#seconds{
color:#f00;
font-weight: bold;;
}
</style>
</head>
<body>
<div class="countdown">
<h2>倒计时(距离2020年6月1日9时)</h2>
<p>
<span id="day"></span> 天
<span id="hours"></span> 小时
<span id="minutes"></span> 分
<span id="seconds"></span> 秒
</p>
</div>
<script>
/**
* 倒计时s
*/
var countDownTime={init:function(a,b,c,d,e){this.t=a,this.d=b,this.h=c,this.m=d,this.s=e},start:function(){var a=this;setInterval(a.timer,1e3)},timer:function(a){var b,c,d,e,f,g,h;a=this.countDownTime,b=new Date,c=new Date(a.t),d=c.getTime()-b.getTime(),e=Math.floor(a.formatTime(d,"day")),f=Math.floor(a.formatTime(d,"hours")),g=Math.floor(a.formatTime(d,"minutes")),h=Math.floor(a.formatTime(d,"seconds")),a.d&&(a.d.innerText=a.formatNumber(e)),a.h&&(a.h.innerText=a.formatNumber(f)),a.m&&(a.m.innerText=a.formatNumber(g)),a.s&&(a.s.innerText=a.formatNumber(h))},formatNumber:function(a){if(a<=0){a=0}
return a=a.toString(),a[1]?a:"0"+a},formatTime:function(a,b){switch(b){case "day":return a/1e3/60/60/24;case "hours":return a/1e3/60/60%24;case "minutes":return a/1e3/60%60;case "seconds":return a/1e3%60}}};
$(function(){
var day = document.getElementById('day');
var hours = document.getElementById('hours');
var minutes = document.getElementById('minutes');
var seconds = document.getElementById('seconds');
// 日 时 分 秒的dom对象
countDownTime.init('2020/6/1 09:00:00', day, hours, minutes, seconds);
countDownTime.start();
});
/* 倒计时 e*/
</script>
</body>
</html>