js 倒计时(转)

DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    script type="text/javascript">
    var duration=9900;
    var endTime = new Date().getTime() + duration + 100;
    function interval()
    {
        var n=(endTime-new Date().getTime())/1000;
        if(n0) return;
        document.getElementById("timeout").innerHTML = n.toFixed(3);
        setTimeout(interval, 10);
    }
    window.onload=function()
    {
        setTimeout("window.location.href=‘http://www.baidu.com‘", duration);
        interval();
    }
    script>
html xmlns="http://www.w3.org/1999/xhtml">
head runat="server">
    title>等待10秒title>
head>
body>
    form id="form1" runat="server">
        div>
             现在剩下 span id="timeout">10.000span> 秒后 将自动跳转        div>
    form>
body>
html>

DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
html xmlns="http://www.w3.org/1999/xhtml">    
    head runat="server">
        title>
            等待10秒
        title>
        script type="text/javascript">
            function run() {
                var s = document.getElementById("dd");
                if (s.innerHTML == 0) {
                    window.location.href = ‘www.baidu.com‘;
                    return false;
                }
                s.innerHTML = s.innerHTML * 1 - 1;
            }
            window.setInterval("run();", 1000);
        script>
    head>    
    body>
        form id="form1" runat="server">
            div>
                请等待span id="dd">10span>秒
            div>
        form>
    body>
html>

html>
    
    head>
        meta http-equiv="Content-Type" content="text/html; charset=gb2312">
        title>
            counter
        title>
        script language="javascript" type="text/JavaScript">
            function Counter(nMax, nInterval) {
                this.maxTime = nMax;
                this.interval = nInterval;
                this.objId = "timer";
                this.obj = null;
                this.num = this.maxTime;
                this.timer = null;
                this.start = function() {
                    this.obj = document.getElementById(this.objId);
                    if (this.num > 0) setTimeout(this.run, this.interval * 1000);
                };
                this.run = function() {
                    if (myCounter.num > 0) {
                        myCounter.num--;
                        myCounter.obj.innerHTML = myCounter.num;
                        myCounter.timer = setTimeout(myCounter.run, myCounter.interval * 1000);
                    } else clearTimeout(myCounter.timer);
                };
                this.show = function() {
                    document.write("" + this.objId + ">" + this.num + "");
                    this.obj = document.getElementById(this.objId);
                    //alert(this.obj.innerHTML);
                }
            }
        script>
    head>
    
    body onload="myCounter.start();">
        script language="JavaScript" type="text/JavaScript">
            var myCounter = new Counter(10, 1);
        script>
        p>
            现在剩下
            script language="JavaScript" type="text/JavaScript">
                myCounter.show();
            script>
            秒钟!
        p>