实现倒计时 2018/12/11 12:00:00 开始秒杀还剩：xx小时xx分钟xx秒
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script type="text/javascript">
function demo(){
//获取当前日期
var nowDate=new Date();
//截止日期
var endDate=new Date('2019/4/30 12:00:00');
var diffTime=parseInt((endDate.getTime()-nowDate.getTime())/1000);
//将时间转化为时 分 秒
var hour,minute,second;
second=diffTime%60;//秒
minute=parseInt(diffTime/60)%60;
hour=parseInt(diffTime/60/60);
var time='剩余：'+hour+'小时'+minute+'分钟'+second+'秒';
document.body.innerHTML=time;
setTimeout(demo,1000);
}
// demo();
// setInterval('demo()',1000);
// demo();
// setInterval(demo,1000);
</script>
</head>
<body>
<script type="text/javascript">
demo();
</script>
</body>
</html>