JavaScript 倒计时实例

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>元旦倒计时</title>
    <style type="text/css">
        #msg{
            text-align: center;
            font-size: 130px;
        }

        #timer{
            font-size: 130px;
            color: red;
        }
    </style>
    <script type="text/javascript">

        function showTime(){
            var currentTime=new Date();
            var endTime=new Date("2015/2/13");
            var remainTime=endTime.getTime()-currentTime.getTime();
            // 1天=24小时  1小时=60分钟  1分钟=60秒  1秒=1000毫秒
            var day=Math.floor(remainTime/(24*60*60*1000));
            var hour=Math.floor((remainTime-day*24*60*60*1000)/(60*60*1000));
            var minute=Math.floor((remainTime-day*24*60*60*1000-hour*60*60*1000)/(60*1000));
            var second=Math.floor((remainTime-day*24*60*60*1000-hour*60*60*1000-minute*60*1000)/(1000));
            if(remainTime<0){
                document.getElementById("msg").innerHTML="元旦已经结束!";
            }else{
            var time=day+"天 "+hour+"时"+minute+"分"+second+"秒!";
            document.getElementById("timer").innerHTML=time;
            }

        }
        setInterval("showTime()",1000);
    </script>
</head>
<body>
    <div id="msg">距离网博放假还有:<br/><span id="timer"></span><br/>一定要Holder住!!!!</div>
</body>
</html>