js计时器倒计时怎么做
var maxtime = 60 * 60; //一个小时,按秒计算,自己调整!
function CountDown() {
if (maxtime >= 0) {
minutes = Math.floor(maxtime / 60);
seconds = Math.floor(maxtime % 60);
msg = '距离结束还有' + minutes + '分' + seconds + '秒';
document.all['timer'].innerHTML = msg;
if (maxtime == 5 * 60)alert('还剩5分钟');
--maxtime;
} else{
clearInterval(timer);
alert('时间到,结束!');
}
}
timer = setInterval('CountDown()', 1000);
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