源代码 ：
点击运行
<!DOCTYPE html> <html> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>表头颜色</h2> <p>.thead-dark 类用于给表头添加黑色背景， .thead-light 类用于给表头添加灰色背景:</p> <table class="table"> <thead class="thead-dark"> <tr> <th>Firstname</th> <th>Lastname</th> <th>Email</th> </tr> </thead> <tbody> <tr> <td>John</td> <td>Doe</td> <td>john@example.com</td> </tr> <tr> <td>Mary</td> <td>Moe</td> <td>mary@example.com</td> </tr> <tr> <td>July</td> <td>Dooley</td> <td>july@example.com</td> </tr> </tbody> </table> <table class="table"> <thead class="thead-light"> <tr> <th>Firstname</th> <th>Lastname</th> <th>Email</th> </tr> </thead> <tbody> <tr> <td>John</td> <td>Doe</td> <td>john@example.com</td> </tr> <tr> <td>Mary</td> <td>Moe</td> <td>mary@example.com</td> </tr> <tr> <td>July</td> <td>Dooley</td> <td>july@example.com</td> </tr> </tbody> </table> </div> </body> </html>
运行结果