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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container mt-3"> <h2>删除边框</h2> <p>使用 .list-group-flush 类可删除边框和圆角：</p> </div> <div class="container mt-3"> <ul class="list-group list-group-flush"> <li class="list-group-item">第一项</li> <li class="list-group-item">第二项</li> <li class="list-group-item">第三项</li> <li class="list-group-item">第四项</li> </ul> </div> </body> </html>