问使用jQuery快速选择表列

EN

<table id="mytable">
  <caption>Legend</caption>
  <colgroup>
    <col style="background-color: #f00;"/>
    <col/>
    <col/>
  </colgroup>
  <thead>
    <tr>
      <th>Column 1</th>
      <th>Column 2</th>
      <th>Column 3</th>
    </tr>
  </thead>
  <tfoot>
    <tr>
      <td>cell 1,1</td>
      <td>cell 1,2</td>
      <td>cell 1,3</td>
    </tr>
  </tfoot>
  <tbody>
    <tr>
      <td>footer 1,1</td>
      <td>footer 1,2</td>
      <td>footer 1,3</td>
    </tr>
  </tbody>
</table> 

<tr class="row row-1">
<td class="col col-1"></td>
<td class="col col-2"></td>
<td class="col col-3"></td>
</tr>

var column = new Array();
var cells;

for (row = 0; row < table.rows.length; row++) {
  tr = table.rows[row];
  column.push(tr.cells[1]);
};