iframe自动适应加载页面高度

<html>
    <head>
       <meta  http-equiv=’Content-Type’  content=’text/html;  charset=gb2312’>
   <meta  name=’author’  content=’吕海鹏//www.DeepTeach.com’>
       <title>iframe自适应加载的页面高度</title>
    </head>

    <body>

    

        <iframe src="2.htm" frameBorder="0" scrolling="no" width="100%" ></iframe>

    

    </body>
</html>

iframe调用页 2.htm 代码如下：

<html>
<head>
   <meta http-equiv='Content-Type' content='text/html; charset=gb2312'>
   <meta  name='author'  content='吕海鹏//www.DeepTeach.com'>
   <title>iframe  自适应其加载的网页(多浏览器兼容)</title>
   <script  language=javascript>
   function iframeAutoFit()
   {
      try
      {
         if(window!=parent)
         {
          var a = parent.document.getElementsByTagName("IFRAME");
            for(var i=0; i<a.length; i++) //www.deepteach.com
            {
               if(a[i].contentWindow==window)
               {
                   var h = document.body.scrollHeight;
                   if(document.all) {h += 4;}
                   if(window.opera) {h += 1;}
                   a[i].style.height = h;
               }
            }
         }
      }
      catch (ex)
      {
         alert("脚本无法跨域操作！");
      }
   }
   if(document.attachEvent)  window.attachEvent("onload",  iframeAutoFit);
   else  window.addEventListener(’load’,  iframeAutoFit,  false);
   </script>
</head>
<body>

   <div  style="  100%;  height:  400;  background-color:  #99CCFF">
       iframe  自适应其加载的网页(多浏览器兼容)
   </div>

</body>
</html>

//成功一定有方法，失败一定有原因。