<table>

<tr>
  <td>apple</td>
  <td>big</td>
</tr>

<tr>
  <td>pickle</td>
  <td>small</td>
</tr>

</table>

经过一些花哨的jquery ……

<table>

<tr>
  <td>apple</td>
  <td>big</td>
  <td>10kg  ------ Is this nice to do,any potential issues?</td>
</tr>

<tr>
  <td>pickle</td>
  <td>small</td>
</tr>

</table>

只是为了好玩：http://jsfiddle.net/Czcby/