html的倒计时学习

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因为业务需要，做个截止到某个时间的倒计时。

网上有现成的，消化吸收了一下，下面是自己今天的学习收获：

<div id="timeShow"></div>
<script type="text/javascript">
var now = new Date();
function createTime()
{
    var desTime = new Date("2012/5/20 12:00:00");
    now.setTime(now.getTime() + 200);
    desMS = (desTime - now) / 1000;
    days = desMS / 60 / 60 / 24;
    dayNum = Math.floor(days);
    hours = (desTime - now) / 1000 / 60 / 60 - (24 * dayNum);
    hourNum = Math.floor(hours);
    if (String(hourNum).length == 1)
    {
        hourNum = "0" + hourNum;
    }
    minutes = desMS / 60 - (24 * 60 * dayNum) - (60 * hourNum);
    minuteNum = Math.floor(minutes);
    if (String(minuteNum).length == 1)
    {
        minuteNum = "0" + minuteNum;
    }
    seconds = desMS - (24 * 60 * 60 * dayNum) - (60 * 60 * hourNum) - (60 * minuteNum);
    secondNum = Math.round(seconds);
    if (String(secondNum).length == 1)
    {
        secondNum = "0" + secondNum;
    }
    document.getElementById("timeShow").innerHTML = dayNum + "day " + hourNum + ":" + minuteNum + ":" + secondNum;
}
setInterval("createTime()", 200);
</script>

因为有的单词大小写出现了问题，总是不成功，郁闷了好久才解决。