child用frame即可
child.html
<frameset rows="0,*">
<frame frameborder="0" framespacing="0" src="about:blank">
<frame frameborder="0" framespacing="0" src="form.html">
</frameset>form.html
<table width="269" height="21" border="0" cellpadding="0" cellspacing="0">
<tr>
<td> <form name="form1" method="post" action="search.asp">
公司名关键字 <input type="text" name="textfield">
<input type="submit" name="Submit" value="查找">
</form>
</td>
</tr>
</table>
child.html
<frameset rows="0,*">
<frame frameborder="0" framespacing="0" src="about:blank">
<frame frameborder="0" framespacing="0" src="form.html">
</frameset>form.html
<table width="269" height="21" border="0" cellpadding="0" cellspacing="0">
<tr>
<td> <form name="form1" method="post" action="search.asp">
公司名关键字 <input type="text" name="textfield">
<input type="submit" name="Submit" value="查找">
</form>
</td>
</tr>
</table>
http://dotnet.aspx.cc/article/49ml4ao8-5pb3-4kny-njzd-ljoioxv4m1x4/read.aspx
办法2:添加
<base target=_self>在IE5下无效。