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<title>Document</title>
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window.onload=function(){
function Timeover(){
var timer=null;//定义定时器对象
var oparenttime=document.getElementsByClassName("liktimer")[0]; //获取对象
var endtime="4/23/2017 15:16:59" //定义结束时间
var endtimer=new Date(endtime).getTime();
var startimer=new Date().getTime();
var opactiontimer=endtimer-startimer;
var second=opactiontimer/1000;//获取总的秒
var Minute=Math.floor(second/60);//获取总的分 var houre=Math.floor(Minute/60);//获取总的小时
var day=Math.floor(houre/24);//获取总的天数
var houres=Math.floor(houre%24);//获取显示的小时
var Minutes=Math.floor(Minute%60);//获取显示的分
var seconds=Math.floor(second%60);//获取显示的秒
document.getElementsByClassName("RemainD")[0].innerHTML=day;
document.getElementsByClassName("RemainH")[0].innerHTML=houres;
document.getElementsByClassName("RemainM")[0].innerHTML=Minutes;
document.getElementsByClassName("RemainS")[0].innerHTML=seconds;
if(startimer>endtimer){ //如果当下的时间大于了过期时间，关闭定时器
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oparenttime.innerHTML="";
oparenttime.innerHTML="倒计时已经结束";
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Timeover();
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loop();//消除帅新等待1秒倒计时的bug
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<div class="liktimer">
<strong class="RemainD"></strong>天
<strong class="RemainH"></strong> 时
<strong class="RemainM"></strong>分
<strong class="RemainS"></strong>秒
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