js 倒计时功能
<html><head><title>2011倒计时</title></head><body><script type="text/javascript">window.onload = function(){ var curDate = new Date();//当前时间 var expireDate = new Date(2012,0,1);//到期时间 var milSecond = expireDate.getTime() - curDate.getTime(); var totalSeconds = removeDecimal(milSecond/1000);//剩余秒(应该用服务器时间替代) timeGo(totalSeconds);}function timeGo(totalSeconds){ setInterval(function(){ totalSeconds--; calculateTime(totalSeconds); },1000);}function calculateTime(totalSeconds){ if (totalSeconds > 0) { var leftDays = removeDecimal(totalSeconds/60/60/24);//剩余天数 var seconds = totalSeconds%(60*60*24); var leftHours = removeDecimal(seconds/60/60);//剩余小时 var leftMinutes = removeDecimal(seconds/60%60);//剩余分 var leftSeconds = removeDecimal(seconds%60);//剩余秒 setLeftTime(leftDays,leftHours,leftMinutes,leftSeconds); } else { document.getElementById('countDown').innerHTML='Happy new year!'; }}function setLeftTime(leftDays,leftHours,leftMinutes,leftSeconds){ document.getElementById('leftDay').innerHTML=leftDays; document.getElementById('leftHour').innerHTML=leftHours; document.getElementById('leftMinute').innerHTML=leftMinutes; document.getElementById('leftSecond').innerHTML=leftSeconds;}//去除小数function removeDecimal(number){ return Math.floor(number);}</script><div id="countDown"> 2011年倒计时： <span id="leftDay" style="background:red"></span>天 <span id="leftHour"></span>小时 <span id="leftMinute"></span>分 <span id="leftSecond"></span>秒</div></body></html>