注册延迟

<!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>
    <title>注册</title>
    <script type="text/javascript">
        var count = 10;  //全局变量
        var intervalId;
        function countDown() {
            var reg = document.getElementById('registerBtn');
            if (reg) {//得先加载控件，因为如果网速慢的话，可能在控件加载之前，定时器就开始运行了
                count--;
                if (count <= 0) {
                    reg.disabled = "";
                    reg.value = "同意";
                    clearInterval(intervalId);//停止计时器
                }
                else {
                 
                    reg.value = "请仔细阅读以上条款,同意后才能注册，还剩(" + count + ")秒";
                }
            }
           
        }
    </script>
</head>
<body onload="intervalId=setInterval('countDown()',1000);">
<textarea rows="4"></textarea>
<table><tr><input type="button" id="registerBtn" value="请仔细阅读以上条款,同意后才能注册，还剩(10)秒" disabled="disabled" />
</tr></table>

</body>
</html>

posted @ 2012-11-24 11:36  FiberHomer  阅读(101)  评论(0)  编辑  收藏  举报