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        簡單的JS倒計時時鐘
        
            
        
              
        
                字號：
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                中
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            代碼如下:
            <!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>
            <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
            <title>倒計時時鐘 - www.update8.com</title>
            <style>
            body,div{margin:0;padding:0;}
            body{color:#fff;font:16px/1.5 \5fae\8f6f\96c5\9ed1;}
            #countdown{width:300px;text-align:center;background:#1a1a1a;margin:10px auto;padding:20px 0;}
            input{border:0;width:283px;height:50px;cursor:pointer;margin-top:20px;background:url(/js_img/20121119/btn-1.png) no-repeat;}
            input.cancel{background-position:0 -50px;}
            span{color:#000;width:80px;line-height:2;background:#fbfbfb;border:2px solid #b4b4b4;margin:0 10px;padding:0 10px;}
            </style>
            <script>
            window.onload = function ()
            {
            var oCountDown = document.getElementById("countdown");
            var aInput = oCountDown.getElementsByTagName("input")[0];
            var timer = null;
            aInput.onclick = function ()
            {
            this.className == "" ? (timer = setInterval(updateTime, 1000), updateTime()) : (clearInterval(timer));
            this.className = this.className == '' ? "cancel" : '';
            };
            function format(a)
            {
            return a.toString().replace(/^(\d)$/,'0$1')
            }
            function updateTime ()
            {
            var aSpan = oCountDown.getElementsByTagName("span");
            var oRemain = aSpan[0].innerHTML.replace(/^0/,'') * 60 + parseInt(aSpan[1].innerHTML.replace(/^0/,''));
            if(oRemain <= 0)
            {
            clearInterval(timer);
            return
            }
            oRemain--;
            aSpan[0].innerHTML = format(parseInt(oRemain / 60));
            oRemain %= 60;
            aSpan[1].innerHTML = format(parseInt(oRemain));
            }
            }
            </script>
            </head>
            <body>
            <div id="countdown">
            <span>01</span>分鐘<span>40</span>秒
            <input type="button" value="" />
            </div>
            </body>
            </html>