table rowspan 用法
<table border="1">
<tr>
<th>AA1</th>
<th>BB1</th>
<th>CC1</th>
<th>DD1</th>
<th>EE1</th>
</tr>
<tr>
<td rowspan="5">A1</td>
<td rowspan="2">B1</td>
<td>C1</td>
<td>D1</td>
<td>E1</td>
</tr>
<tr>
<td>C2</td>
<td>D2</td>
<td>E2</td>
</tr>
<tr>
<td rowspan="3">B2</td>
<td>C3</td>
<td>D3</td>
<td>E3</td>
</tr>
<tr>
<td>C4</td>
<td>D4</td>
<td>E4</td>
</tr>
<tr>
<td>C5</td>
<td>D5</td>
<td>E5</td>
</tr>
<tr>
<td>A2</td>
<td>B3</td>
<td>C6</td>
<td>D6</td>
<td>E6</td>
</tr>
</table>