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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</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"> <h1>基本网格结构</h1> <p>请调整浏览器窗口大小来查看效果。</p> <p>当屏幕宽度小于 576px 时，第一行、第二行和第三行会自动堆叠在一起。</p> <!-- 控制列宽，以及它们在不同设备上的显示方式 --> <div class="row"> <div class="col-sm-6 bg-primary text-white">50%</div> <div class="col-sm-6 bg-dark text-white">50%</div> </div> <br> <div class="row"> <div class="col-sm-4 bg-primary text-white">33.33%</div> <div class="col-sm-4 bg-dark text-white">33.33%</div> <div class="col-sm-4 bg-primary text-white">33.33%</div> </div> <br> <!-- 或者让 Bootstrap 自动处理布局 --> <div class="row"> <div class="col-sm bg-primary text-white">25%</div> <div class="col-sm bg-dark text-white">25%</div> <div class="col-sm bg-primary text-white">25%</div> <div class="col-sm bg-dark text-white">25%</div> </div> <br> <div class="row"> <div class="col bg-primary text-white">25%</div> <div class="col bg-dark text-white">25%</div> <div class="col bg-primary text-white">25%</div> <div class="col bg-dark text-white">25%</div> </div> </div> </body> </html>