<body>
<div>
<span id="cd_day"></span>
<span id="cd_hours"></span>
<span id="cd_minutes"></span>
<span id="cd_seconds"></span>
</div>
<!-- 倒计时 天 时 分 -->
<script>
function check(i){
if(i<10){
i=‘0‘+i;
}
return i;
}
function GetRTime(){
var EndTime= new Date(‘2017/2/14 00:00:00‘);
var NowTime = new Date();
var t =EndTime.getTime() - NowTime.getTime();
var d=0;
var h=0;
var m=0;
var s=0;
if(t>=0){
d=Math.floor(t/1000/60/60/24);
h=Math.floor(t/1000/60/60%24);
m=Math.floor(t/1000/60%60);
s=Math.floor(t/1000%60);
}
d=check(d);
h=check(h);
m=check(m);
s=check(s);
document.getElementById("cd_day").innerHTML = d;
document.getElementById("cd_hours").innerHTML = h;
document.getElementById("cd_minutes").innerHTML = m ;
document.getElementById("cd_seconds").innerHTML = s;
}
setInterval(GetRTime,0);
</script>
<!-- 倒计时天数 -->
<script>
function GetRTime(){
var EndTime= new Date(‘2017/2/16 00:00:00‘);
var NowTime = new Date();//当前电脑时间
var t =EndTime.getTime() - NowTime.getTime();
var d = 0;
if(t >= 0){
if(d <10){
d = ‘0‘+ Math.floor(t/1000/60/60/24)
}else{
d = Math.floor(t/1000/60/60/24);
}
}
document.getElementById("t_d").innerHTML = d;
}
setInterval(GetRTime,0);
</script>
</body>
原文：http://www.cnblogs.com/1314520zqj/p/6373623.html