index.html

<html>
    <head>
        <meta http-equiv="content-type" content="text/html;charset=utf-8" />
        <title>index</title>
    </head>
    <frameset rows="130,*">
        <frame src="test1.html" name="topFrame"/>
                <!--test2.html页面是另一个frameset-->
        <frame src="test2.html" name="mainFrame"/>
    </frameset>
</html>

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test1.html

<h1>test1.html</h1>

------------------------------------------------------------------------------------------------------------------

test2.html

<frameset cols="50,*">
    <frame src="test2_1.html" />
    <frame src="test2_2.html" />
</frameset>


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test2_1.html  

test2_2.html