<body>
<iframe src="a.htm" onload="alert('Iframe内容更新完成了');"></iframe>
</body>

解决方案 »

  1.   

    谢谢提醒。
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
    <title>无标题文档</title>
    <script language="JavaScript" type="text/JavaScript">
    <!--
    function MM_reloadPage(init) {  //reloads the window if Nav4 resized
      if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
        document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
      else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
    }
    MM_reloadPage(true);function changepage(url)
    {
    document.all.myframe.src = url;
    document.all.Layer1.style.display='';
    }
    function loadfinished()
    {
    document.all.Layer1.style.display='none';
    }
    //-->
    </script>
    </head><body>
    <div id="Layer1" style="position:absolute; left:94px; top:71px; width:98px; height:12px; z-index:1; background-color: #FFFFCC; layer-background-color: #FFFFCC; border: 1px none #000000;">正在下载...</div>
    <form name="form1" method="post" action="">
      <input type="button" name="Submit2" value="按钮" onClick="changepage('test1.htm')">
      <input type="button" name="Submit" value="按钮" onClick="changepage('test2.htm')">
    </form>
    <iframe id="myframe" height="200" width="300" frameborder="1" src="test1.htm"  onload="loadfinished()">
    </iframe></body>
    </html>