摘自w3school(http://www.w3school.com.cn/tags/att_td_colspan.asp)
colspan 属性规定单元格可横跨的列数。
<table border="1"> <tr> <th>Month</th> <th>Savings</th> </tr> <tr> <tdcolspan="2"
>January</td> </tr> <tr> <tdcolspan="2"
>February</td> </tr> </table>
rowspan 属性规定单元格可横跨的行数。
<table border="1">
<tr>
<th>Month</th>
<th>Savings</th>
</tr>
<tr>
<td>January</td>
<td>$100.00</td>
<td rowspan="2"
>$50</td>
</tr>
<tr>
<td>February</td>
<td>$10.00</td>
</tr>
</table>