首先：引入jquery文件
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<script type="text/javascript"
src="http://www.cnblogs.com/Content/Phone/js/Answer.js?201402242021"></script> |
然后写javascript代码
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<script type="text/javascript"> $(function () { timer; }) var
maxtime = 20 * 100; function CountDown() { if
(maxtime >= 0) { seconds = Math.floor(maxtime / 100); milliseconds = Math.floor(maxtime % 100); seconds = seconds < 10 ? ("0"
+ seconds) : seconds; milliseconds = milliseconds < 10 ? ("0"
+ milliseconds) : milliseconds; $(".time").text(seconds + ":"
+ milliseconds); //if(maxtime == 5*60) alert(‘注意，还有5分钟!‘); if
(maxtime == 270) { //$("#musicNear")[0].play(); } maxtime -= 10; } } timer = window.setInterval(CountDown, 100);</script> |
原文：http://www.cnblogs.com/qiailu/p/3570864.html