js 倒计时功能

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>时间倒计时</title>
    <script src="TimeDown.js"></script>
</head>
<body>
<form id="form1" runat="server">
    <div id="show"></div>
    <script type="text/javascript">
        TimeDown("show", "2019-11-25 9:54:00");
        function TimeDown(id, endDateStr) {
            //结束时间
            var endDate = new Date(endDateStr);
            //当前时间
            var nowDate = new Date();
            //相差的总秒数
            var totalSeconds = parseInt((endDate - nowDate) / 1000);
            //天数
            var days = Math.floor(totalSeconds / (60 * 60 * 24));
            //取模(余数)
            var modulo = totalSeconds % (60 * 60 * 24);
            //小时数
            var hours = Math.floor(modulo / (60 * 60));
            modulo = modulo % (60 * 60);
            //分钟
            var minutes = Math.floor(modulo / 60);
            //秒
            var seconds = modulo % 60;

            if(parseInt(days)<10){
                days="0"+days;
            }
            if(parseInt(hours)<10){
                hours="0"+hours;
            }
            if(parseInt(minutes)<10){
                minutes="0"+minutes;
            }
            if(parseInt(seconds)<10){
                seconds="0"+seconds;
            }

            //输出到页面
            document.getElementById(id).innerHTML = "还剩:" + days + "天" + hours + "小时" + minutes + "分钟" + seconds + "秒";
            //延迟一秒执行自己
            setTimeout(function () {
                TimeDown(id, endDateStr);
            }, 1000);
        }
    </script>
</form>
</body>
</html>

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