在表格中如何在列中查找输入单元格索引的最后数据 我的桌子就像下面一样
<table border="1">
<tr>
<th>Header 1</th>
<th>Header 2</th>
</tr>
<tr>
<td>row 1, cell 1</td>
<td>row 1, cell 2</td>
</tr>
<tr>
<td>row 2, cell 1</td>
<td>row 2, cell 2</td>
</tr>
<tr>
<td>row 3, cell 1</td>
<td>row 3, cell 2</td>
</tr>
<tr>
<td></td>
<td>row 4, cell 2</td>
</tr>
<tr>
<td>row 5, cell 1</td>
<td>row 5, cell 2</td>
</tr>
<tr>
<td></td>
<td>row 6, cell 2</td>
</tr>
<tr>
<td>row 7, cell 1</td>
<td>row 7, cell 2</td>
</tr>
<tr>
<td>row 8, cell 1</td>
<td>row 8, cell 2</td>
</tr>
<tr>
<td></td>
<td>row 9, cell 2</td>
</tr>
<tr>
<td></td>
<td>row 10, cell 2</td>
</tr>
</table>
在上表中我想要第一列最后输入的单元格索引是8 如何使用jquery动态表达式找到它。