倒计时


	<!doctype html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>倒计时js</title>
	<style>
	*{ margin:0; padding:0; list-style:none;}
	body{ font-size:18px; text-align:center;}
	.time{ height:30px; padding:200px;}
	</style>
	</head>
	<body>
	<div class="time">
	<span id="t_d">00天</span>
	<span id="t_h">00时</span>
	<span id="t_m">00分</span>
	<span id="t_s">00秒</span>
	</div>
	<script>
	function GetRTime(){
	var EndTime= new Date('2016/04/21 00:00:00');
	var NowTime = new Date();
	var t =EndTime.getTime() - NowTime.getTime();
	var d=Math.floor(t/1000/60/60/24);
	var h=Math.floor(t/1000/60/60%24);
	var m=Math.floor(t/1000/60%60);
	var s=Math.floor(t/1000%60);

	document.getElementById("t_d").innerHTML = d + "天";
	document.getElementById("t_h").innerHTML = h + "时";
	document.getElementById("t_m").innerHTML = m + "分";
	document.getElementById("t_s").innerHTML = s + "秒";
	}
	setInterval(GetRTime,0);
	</script>
	</body>
	</html>