<html><head><style>table, th, td { border: 1px solid black;}</style></head><body><h3>如何访问 TFOOT 元素的演示</h3><table> <thead> <tr> <th>标题 1</th> <th>Header 2</th> </tr> </thead> <tbody> <tr> <td>Cell 1</td> <td>Cell 2</td> </tr> <tr> <td>Cell 3</td> <td>Cell 4</td> </tr> </tbody> <tbody id="myTFoot"> <tr> <td>Footer 1</td> <td>Footer 2</td> </tr> </tbody></table><p>单击该按钮可更改 TFOOT 元素的样式。</p><button onclick="myFunction()">试一试</button><p id="demo"></p><script>