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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; border-collapse: collapse; } </style> </head> <body> <h1>列组</h1> <p>添加包含跨两列的 col 元素的 colgroup，为这两列定义样式：</p> <table style="width: 100%;"> <colgroup> <col span="2" style="background-color: #D6EEEE"> </colgroup> <tr> <th>MON</th> <th>TUE</th> <th>WED</th> <th>THU</th> <th>FRI</th> <th>SAT</th> <th>SUN</th> </tr> <tr> <td>1</td> <td>2</td> <td>3</td> <td>4</td> <td>5</td> <td>6</td> <td>7</td> </tr> <tr> <td>8</td> <td>9</td> <td>10</td> <td>11</td> <td>12</td> <td>13</td> <td>14</td> </tr> <tr> <td>15</td> <td>16</td> <td>17</td> <td>18</td> <td>19</td> <td>20</td> <td>21</td> </tr> <tr> <td>22</td> <td>23</td> <td>24</td> <td>25</td> <td>26</td> <td>27</td> <td>28</td> </tr> </table> </body> </html>