用css来控制就可以了
<div style="position:absolute">
<input type="text" style="position:absolute;left:0;top:0;width:120px;height:25px;"/>
<input type="button" value="test" style="position:absolute;left:70px;top:1px;width:50px"/>
</div>
<div style="position:absolute">
<input type="text" style="position:absolute;left:0;top:0;width:120px;height:25px;"/>
<input type="button" value="test" style="position:absolute;left:70px;top:1px;width:50px"/>
</div>
<HEAD>
<title>WebForm2</title>
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<INPUT style="BORDER-TOP: 1px solid; Z-INDEX: 101; LEFT: 112px; BORDER-LEFT: 1px solid; WIDTH: 128px; BORDER-BOTTOM: 1px solid; BORDER-RIGHT-STYLE: none; POSITION: absolute; TOP: 48px; HEIGHT: 20px" type="text" size="16">
<INPUT style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; Z-INDEX: 102; LEFT: 240px; BORDER-LEFT: 1px; WIDTH: 20px; BORDER-BOTTOM: 1px solid; POSITION: absolute; TOP: 48px; HEIGHT: 20px" type="button" value="+">
</form>
</body>
</HTML>
比如<td><input type="text" name="testBox"></td>我要实现的就是让testBox成为一个组合下拉框啊