可写可选的下拉列表和文本框组合

<span style="position:absolute;border:1pt solid #bbcdd9;overflow:hidden;clip:rect(0px 190px 190px 85px);">
<select name="aabb" id="downloadpriceList" style="width:100px;" onChange="javascript:document.getElementById('ccdd').value=document.getElementById('downloadpriceList').options[document.getElementById('downloadpriceList').selectedIndex].value;">
</select>
</span>
<span style="position:absolute;border-top:1pt solid #bbcdd9;border-left:1pt solid #bbcdd9;border-bottom:1pt;solid #bbcdd9;width:80px;">
<input type="text" name="downloadprice" id="ccdd" style="width:80px;border:0pt solid #bbcdd9;"/>
</span>