用javascript写的一个简单的常用js倒计时效果，小计一下，代码如下：
html&css：
<style type="text/css">
.time-box{width:650px;height:50px;margin:50px auto; font:600 26px/50px "微软雅黑"}
.time-box span{color:#f00; margin:0 10px;}
</style>
<div class="time-box">
<p><b>1、杯具，2014年已经过了:</b></p>
<div id="time-count"></div>
</div>
<div class="time-box">
<p><b>2、杯具，离过年还有这么久啊:</b></p>
<div id="time-down"></div>
</div>
javascript:
var i=0;
function countTime(starT,obj){
i++;
var time=null;
if(new Date().getTime()>new Date(starT).getTime()){
time=(new Date().getTime()-new Date(starT).getTime()+1000*i)/1000;
}else{
time=(new Date(starT).getTime()-new Date().getTime()-1000*i)/1000;
}
var day=Math.floor(time/(24*60*60)),
hours=Math.floor(time/(60*60))-day*24,
minutes=Math.floor(time/60)-(day*24*60)-(hours*60),
seconds=Math.floor(time)-(day*24*60*60)-(hours*60*60)-(minutes*60);
if(day<10){day="0"+day}
if(hours<10){hours="0"+hours}
if(minutes<10){minutes="0"+minutes}
if(seconds<10){seconds="0"+seconds}
document.getElementById(obj).innerHTML="<span class='day'>"+day+"</span>天<span class='hours'>"+hours+"</span>小时<span class='minutes'>"+minutes+"</span>分钟<span class='seconds'>"+seconds+"</span>秒";
setTimeout(function(){
countTime(starT,obj);
},1000);
}
countTime("0:00:00 01/01/2014","time-count");
countTime("0:00:00 12/30/2016","time-down");
效果如下：
