frameset用在body外，noframes将body框起来
<html>
<head>
<title>Frame范例</title>
</head>
<frameset cols="30%,50%,20%">
<frame src="a.htm" name="1" frameborder=1>
<frame src="b.htm" name="2" frameborder=1>
<frame src="c.htm" name="3" frameborder=1>
<noframes>
<BODY bgcolor=Blue>
<H1>对不起，你的浏览器不支持Frame！</H1>
</BODY>
</noframes>
</frameset>
</html>
嵌套
<html>
<head>
<title>Frame范例</title>
</head>
<frameset cols="20%,*">
<frame src="a.htm" name="1" bordercolor=#00ff00>
<frameset rows="40%,*">
<frame src="color-b.htm" name="2" bordercolor=#00ff00>
<frame src="color-c.htm" name="3" bordercolor=#00ff00>
</frameset>
<noframes>
<body bgcolor="#FF0000">
对不起，您的页面不支持框架，请考虑升级您的浏览器
</body>
</noframes>
</frameset>
</html>
<html>
<head>
<title>Frame范例</title>
</head>
<frameset rows="30%,50%,20%">
<frame src="a.htm" name="1" frameborder=1>
<frame src="b.htm" name="2" frameborder=1>
<frame src="c.htm" name="3" frameborder=1>
<noframes>
<body bgcolor="#FF0000">
</body>
</noframes>
</frameset>
</html>
