<p align=center><font size=6 face="黑体"><b>2008年北京奥运会</b></font></p>
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var dtime = new Date("8/8/2008");    
now.setTime(now.getTime()+100); 
days = (dtime - now) / 1000 / 60 / 60 / 24;    
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hours = (dtime - now) / 1000 / 60 / 60 - (24 * daysRound);    
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secondsRound = Math.floor(seconds); 
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time.innerHTML = daysRound + "天" +hoursRound + "小时" + minutesRound + "分" + secondsRound + "秒";    
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<p align=center>距离2008年8月8日还有<span id="time"></span></p>