Dom 学习总结以及实例的使用介绍(4)


阅读协议等待计时器
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
 <html>
     <head>
         <title>欢迎来到daomul的博客,欢迎再来,谢谢</title>
         <script type="text/javascript">

             var leftTime = 10;
             var TimeID;
             function scroll() {//alert(222);
                 var btn = document.getElementById("btnAgree");
                 //如果网页速度非常慢的话,可能定时器运行的时候控件还没有加载!
                 if (btn) {//alert(11);
                     if (leftTime <= 0) {
                         btn.value = "同意";
                         btn.disabled = "";
                         clearInterval(TimeID);
                     }
                     else {
                         btn.value = "请阅读协议,同意(还剩下"+leftTime+"秒)";
                         leftTime--;
                     }
                 }
             }
             TimeID=setInterval("scroll()", 1000);
          </script>
     </head>
     <body>
         <textarea cols="20" rows="2"></textarea>
         <input type="button" value="同意" disabled="disabled"/>
     </body>
 </html>


案例5:

复制代码 代码如下:

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