倒计时4小时实现

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>JS实现倒计时(时、分,秒)</title> <script type="text/javascript" src="jquery-1.10.1.min.js"></script><script language="javascript" type="text/javascript"> window.onload=function(){var lefts=4*60*60;var int=setInterval(clock,1000);function clock(){var hour=Math.floor((lefts)/3600);         var minute=Math.floor((lefts-hour*3600)/60);         var second=Math.floor(lefts-hour*3600-minute*60);        lefts=lefts-1;$('#divdown1').html("活动结束还有:"+hour+"小时"+minute+"分"+second+"秒");if(hour==0 && minute==0 && second==0){window.clearInterval(int);} }}</script> </head> <body> <div id="divdown1"></div> </body> </html> 

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