时间倒计时实现代码

效果:

时间倒计时实现代码

实现的代码:

<html>
<head>
    <title>倒计时-木庄博客整理</title>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body onload="clock();return true" text="red">
    距离2020年元旦还有
    <br />
    <!--倒计时设置代码-->
    <script language="JavaScript" type="text/javascript">
            <!-- hide script from old browser
            var DifferenceHour = -1
            var DifferenceMinute = -1
            var DifferenceSecond = -1
            var Tday = new Date("Jan 1, 2020 00:00:00")   //**倒计时时间点-注意格式
            var daysms = 24 * 60 * 60 * 1000
            var hoursms = 60 * 60 * 1000
            var Secondms = 60 * 1000
            var microsecond = 1000
            function clock()
            {
            var time = new Date()
            var hour = time.getHours()
            var minute = time.getMinutes()
            var second = time.getSeconds()
            var timevalue = ""+((hour > 12) ? hour-12:hour)
            timevalue +=((minute < 10) ? ":0":":")+minute
            timevalue +=((second < 10) ? ":0":":")+second
            timevalue +=((hour >12 ) ? " PM":" AM")
            var convertHour = DifferenceHour
            var convertMinute = DifferenceMinute
            var convertSecond = DifferenceSecond
            var Diffms = Tday.getTime() - time.getTime()
            DifferenceHour = Math.floor(Diffms / daysms)
            Diffms -= DifferenceHour * daysms
            DifferenceMinute = Math.floor(Diffms / hoursms)
            Diffms -= DifferenceMinute * hoursms
            DifferenceSecond = Math.floor(Diffms / Secondms)
            Diffms -= DifferenceSecond * Secondms
            var dSecs = Math.floor(Diffms / microsecond)
            if(convertHour != DifferenceHour) document.formnow.dd.value=DifferenceHour
            if(convertMinute != DifferenceMinute) document.formnow.hh.value=DifferenceMinute
            if(convertSecond != DifferenceSecond) document.formnow.mm.value=DifferenceSecond
            document.formnow.ss.value=dSecs
            setTimeout("clock()",1000)
            }
    </script>
    <!--BODY里面的ONLOAD注意-->
    <!--实现显示-->
    <form name="formnow">
    <input value="1" name="dd" style="border: 0; width:36px;" size="2" type="text" />
    天
    <input value="1" name="hh" style="border: 0;" size="2" type="text" />
    小时
    <input value="1" name="mm" style="border: 0;" size="2" type="text" />
    分
    <input value="1" name="ss" style="border: 0;" size="2" type="text">
    秒
    </form>
    <!--倒计时完毕-->
</body>
</html>

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