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html代码
<h3 class="textnume">剩余时间：
<span id="t_d">00</span> 天
<span id="t_h">00</span> 时
<span id="t_m">00</span> 分
<span id="t_s">00</span> 秒
</h3>
JS代码
<input type="hidden" name="end_time" id="end_time" value="<?php echo date(‘Y/m/d h:i:s‘,$output[‘sy_one‘][‘end_bg_time‘]);?>" />
<!--JS倒计时-->
<script type="text/javascript">
function getRTime(){
var end_time_valal = $("#end_time").val();
var EndTime= new Date(end_time_valal); //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);
if (d <= 9) d = ‘0‘ + d;
if (h <= 9) h = ‘0‘ + h;
if (m <= 9) m = ‘0‘ + m;
if (s <= 9) s = ‘0‘ + s;
document.getElementById("t_d").innerHTML = d + "";
document.getElementById("t_h").innerHTML = h + "";
document.getElementById("t_m").innerHTML = m + "";
document.getElementById("t_s").innerHTML = s + "";
}
setInterval(getRTime,1000);
</script>
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原文地址：http://www.cnblogs.com/richerdyoung/p/4535023.html
