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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> table, th, td { border: 1px solid black; border-collapse: collapse; } table.center { margin-left: auto; margin-right: auto; } </style> </head> <body> <h2>居中表格</h2> <p>要使表格居中，请将左右外边距设置为自动：</p> <table class="center"> <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>