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>
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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> |