js 获取 table 某一列
<table width="504" border="1" >
<colgroup>
<col id="c1"/>
<col id="c2"/>
<col id="c3"/>
</colgroup>
<tr>
<td width="58">id</td>
<td width="81">人数</td>
<td width="343"> 具体描述</td>
</tr>
<tr>
<td width="58" onClick="hide()">1</td>
<td width="81" onClick="hide()">10</td>
<td width="343">asdffdaf</td>
</tr>
</table>
<script language="javascript">
function hide(){
document.getElementById("c3").style.display="none";
}
</script>
<colgroup>
<col id="c1"/>
<col id="c2"/>
<col id="c3"/>
</colgroup>
<tr>
<td width="58">id</td>
<td width="81">人数</td>
<td width="343"> 具体描述</td>
</tr>
<tr>
<td width="58" onClick="hide()">1</td>
<td width="81" onClick="hide()">10</td>
<td width="343">asdffdaf</td>
</tr>
</table>
<script language="javascript">
function hide(){
document.getElementById("c3").style.display="none";
}
</script>