<html><head> <meta charset="utf-8"> <title>蝴蝶教程（cainiaoya.com）</title> <style> table { border-collapse: collapse; border: 1px solid black; } </style></head><body><h2>只有表有边界：</h2><table> <tr> <th>姓氏</th> <th>名字</th> </tr> <tr> <td>张</td> <td>三</td> </tr> <tr> <td>李</td> <td>四</td> </tr></table></body></html>