<html><head><style>table, th, td { border: 1px solid black; border-collapse: collapse;}</style></head><body><h2>折叠边框</h2><p>如果您希望边框折叠为一个边框，请添加 CSS border-collapse 属性。</p><table style="width:100%"> <tr> <th>Firstname</th> <th>Lastname</th> <th>Age</th> </tr> <tr> <td>Jill</td> <td>Smith</td> <td>50</td> </tr> <tr> <td>Eve</td> <td>Jackson</td> <td>94</td> </tr> <tr> <td>John</td> <td>Doe</td> <td>80</td> </tr></table></body></html>