使用方法：

1、head引入css文件

<link rel="stylesheet" href="./css/cdn.css">

2、head引入js文件

<script src="js/jquery.min.js"></script>

3、body引入HTML代碼

<div class="se-kl">
	<div class="se-cn">倒計時</div>
	<div class="se-en">COUNT DOWN</div>
	<i class="se-io"></i>
	<div class="se-info">距離結(jié)束還剩</div>
	<div class="se-count">
		<div class="se-day"></div>
		<div class="se-hour"><span class="se-txt">00</span></div>
		<div class="se-min"><span class="se-txt">00</span></div>
		<div class="se-sec"><span class="se-txt">00</span></div>
	</div>
</div>

<script type="text/javascript">
	$(document).ready(function () {
		var oDate = new Date();
		var nowTime = oDate.getTime(); //現(xiàn)在的毫秒數(shù)
		oDate.setDate(oDate.getDate() + 1); // 設(shè)定截止時間為第二天
		var targetDate = new Date(oDate.toLocaleDateString());
		run(targetDate);
	});

	function run(enddate) {
		getDate(enddate);
		setInterval("getDate('" + enddate + "')", 500);
	}

	function getDate(enddate) {
		var oDate = new Date(); //獲取日期對象

		var nowTime = oDate.getTime(); //現(xiàn)在的毫秒數(shù)
		var enddate = new Date(enddate);
		var targetTime = enddate.getTime(); // 截止時間的毫秒數(shù)
		var second = Math.floor((targetTime - nowTime) / 1000); //截止時間距離現(xiàn)在的秒數(shù)

		var day = Math.floor(second / 24 * 60 * 60); //整數(shù)部分代表的是天；一天有24*60*60=86400秒 ；
		second = second % 86400; //余數(shù)代表剩下的秒數(shù)；
		var hour = Math.floor(second / 3600); //整數(shù)部分代表小時；
		second %= 3600; //余數(shù)代表 剩下的秒數(shù)；
		var minute = Math.floor(second / 60);
		second %= 60;
		var spanH = $('.se-txt')[0];
		var spanM = $('.se-txt')[1];
		var spanS = $('.se-txt')[2];

		spanH.innerHTML = tow(hour);
		spanM.innerHTML = tow(minute);
		spanS.innerHTML = tow(second);
	}

	function tow(n) {
		return n >= 0 && n < 10 ? '0' + n : '' + n;
	}
</script>