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<SCRIPT type="text/javascript">
var exam_time=${testPaper.examTime*60};//获取后台传的时间
if(window.name==‘‘){
maxtime = exam_time; //此处几句判断是防刷新关键
}else{
maxtime = window.name;
}
function CountDown(){
if(maxtime>=0){
hours = Math.floor(maxtime/3600);
minutes = Math.floor((maxtime-hours*3600)/60);
seconds = Math.floor(maxtime%60);
msg = "距离考试结束还有"+hours+"时"+minutes+"分"+seconds+"秒";
document.getElementById("time").innerHTML = msg;
if(maxtime == 5*60) alert(‘注意,还有5分钟!‘);
--maxtime;
window.name = maxtime;
}
else{
document.getElementById("frm").submit();
clearInterval(timer);
alert("考试时间到,结束!");
}
}
timer = setInterval("CountDown()",1000);
</SCRIPT>
<center><font color="red"><div id="time"></div></font></center> //此处显示倒计时时间
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原文地址:http://www.cnblogs.com/shaoyang/p/5198914.html