在HTML表中隐藏/显示列

  <tr>
    <th>姓名</th>
    <th>年龄</th>
    <th>性别</th>
  </tr>
  <tr>
    <td>张三</td>
    <td>25</td>
    <td>男</td>
  </tr>
  <tr>
    <td>李四</td>
    <td>30</td>
    <td>女</td>
  </tr>
</table>

table th:nth-child(2),
table td:nth-child(2) {
  display: none;
}

table th:nth-child(2),
table td:nth-child(2) {
  display: table-cell;
}