代码演示 横向合并：
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>演示table标记2--单元格合并</title>
<style type="text/css">
td{
text-align: center;
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<table border="1" cellspacing="0" width="50%" height="150">
<caption>横向合并单元格</caption>
<!--colspan中必须指定要合并的列数目，是两列还是三列等等-->
<tr> <th colspan="2">姓名和年龄</th> <th>电话</th> </tr>
<tr> <td>Jack</td> <td>24</td> <td>1351234567</td> </tr>
<tr> <td>Tom</td> <td>22</td> <td>1351234567</td> </tr>
<tr> <td>Rose</td> <td>22</td> <td>1351234567</td> </tr>
<tr> <td>张三</td> <td>25</td> <td>1351234567</td> </tr>
</table>
<br/>
<table border="1" cellspacing="0" width="50%" height="150">
运行结果：
代码演示 纵向合并：
<table border="1" cellspacing="0" width="50%" height="150">
<caption>纵向合并单元格</caption>
<tr><th>班级</t> <th>姓名</th><th>年龄</th> <th>电话</th> </tr>
<tr><td rowspan="2">601班</td> <td>Jack</td> <td>24</td> <td>1351234567</td> </tr>
<tr> <td>Tom</td> <td>22</td> <td>1351234567</td> </tr>
<!--rowspan中必须指定要合并的列数目，是两行还是三行等等-->
<tr><td rowspan="3">602班</td> <td>Rose</td> <td>22</td> <td>1351234567</td> </tr>
<tr> <td>张三</td> <td>25</td> <td>1351234567</td> </tr>
<tr> <td>李四</td> <td>25</td> <td>1351234567</td> </tr>
</table>
</body>
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原文：https://blog.csdn.net/qq_35415600/article/details/70237433