Javascript访问FrameSet

Javascript访问Frameset

<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title></title>
 <script type="text/javascript">
      window.onload=function(){
        alert(self.frames["topFrame"].parent.frames["leftFrame"]);     
      };
 </script>
</head>
<base target="mainFrame">
<frameset rows="69,*" cols="*" frameborder="NO" border="0"
    framespacing="0">
    <frame src="index_top.jsp" name="topFrame" scrolling="NO" noresize>
    <frameset cols="200,*" frameborder="NO" border="0" framespacing="0">
        <frame src="index_left.jsp" scrolling="auto" name="leftFrame" noresize>
        <frameset rows="90,*" cols="*" frameborder="NO" border="0"
            framespacing="0">
            <frame src="mainFrame_top.jsp" scrolling="NO" name="mainFrame_top"
                noresize>
             
        </frameset>
    </frameset>
</frameset>
<noframes>
<body>
</body>
</noframes>

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