HTML select option基础理解及使用

HTML代码:

复制代码
<TABLE width="100%" border=0 align="left" cellPadding=0 cellSpacing=1>
<tr>
<td class="Search_item_18"> <span class="Edit_mustinput">*</span>引用软件：</td>
<td class="Search_content_82">
<input name="yyrjMc" id="yyrjMc" type="text" class="Search_input" tabindex="3" size="30" >
<input name="yyrjDm" id="yyrjDm" type="hidden" >
<input type="button" class="Search_button_select"
onClick="linkAgeTree('linkage','yyrjtree','yyrjMc','yyrjDm','linkageTree','1');" value="选择...">
</td>
</tr>
<tr>
<td class="Search_item"> <span class="Edit_mustinput">*</span>引用分版：</td>
<td class="Search_content" id="yyfb">
<select name="yyfbDm" style="width:160" id="yyfbDm" onChange="getCpgjThgl('yyfbDm','thgjDm')">
</select>
</td>
</tr>
<tr>
<td class="Search_item">退化构件：</td>
<td class="Search_content" id="thgj">
<select name="thgjDm" style="width:160" id="thgjDm">
<option value="-1" selected>无</option>
</select>
</td>
</tr>
</TABLE>