js代码

<script type="text/javascript">
function getRTime() {
	var EndTime = new Date("2020/01/01 00:00:00"); //截止时间
	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, 1000);
</script>