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<title>正計時</title>
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<script type="text/javascript" language="javascript">
function thenceThen(){
var date1 = new Date(1381741113671);
var totalSecs=(new Date()-date1)/1000;
var days=Math.floor(totalSecs/3600/24);
var hours=Math.floor((totalSecs-days*24*3600)/3600);
var mins=Math.floor((totalSecs-days*24*3600-hours*3600)/60);
var secs=Math.floor((totalSecs-days*24*3600-hours*3600-mins*60));
if (days != 0 ) {
document.getElementById("thenceThen").innerText=" 答題時間："+days+"天"+hours+"小時"+mins+"分鐘"+secs+"秒";
}else if (hours == 0 && mins == 0) {
document.getElementById("thenceThen").innerText=" 答題時間："+secs+"秒";
}else if (hours == 0 && mins != 0) {
document.getElementById("thenceThen").innerText=" 答題時間："+mins+"分鐘"+secs+"秒";
}else if (hours != 0) {
document.getElementById("thenceThen").innerText=" 答題時間："+hours+"小時"+mins+"分鐘"+secs+"秒";
}
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window.onload=function(){
clock=self.setInterval("thenceThen()", 500);
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<div id="thenceThen"></div>
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