<html>
<body style="margin:0;">
<div>
<table style="width:100%;height:100%" cellpadding='0' cellspacing='0'>
<tr>
<td style="width:120px;background-color:Red">
<iframe id="MU" name="MU" style="position:absolute;top:auto;bottom:0px;height:100%;left:auto;right:0px;width:100%">
</iframe>
</td>
<td style="background-color:Yellow">
<iframe id="WA" name="WA" style="position:absolute;top:0px;bottom:0px;left:120px;right:0px;width:100%;height:100%"
src="about:blank">
</iframe>
<div >a</div>
</td>
</tr>
</table>
</div>
</body>
</html>
注： position:absolute;top:auto;bottom:0px;height:100%;left:auto;right:0px;width:100%
去掉top:auto;bottom:0px;height:100%;为宽度自适应
去掉left:auto;right:0px;width:100%为高度自适应
