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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-fluid mt-3"> <h2>三等分列</h2> <p>您还可以使用数字来控制列宽。只需确保总和等于或小于 12（不需要使用所有 12 个可用列）：</p> <div class="row"> <div class="col-4 bg-success">.col-4</div> <div class="col-4 bg-warning">.col-4</div> <div class="col-4 bg-success">.col-4</div> </div> </div> </body> </html>