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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>伸展</h2> <p>在 flex 项目上使用 .flex-grow-1 可占用多余的空间：</p> <div class="d-flex mb-3"> <div class="p-2 bg-info">弹性项目 1</div> <div class="p-2 bg-warning">弹性项目 2</div> <div class="p-2 flex-grow-1 bg-primary">弹性项目 3</div> </div> <p>Example without .flex-grow-1:</p> <div class="d-flex mb-3 bg-secondary"> <div class="p-2 bg-info">弹性项目 1</div> <div class="p-2 bg-warning">弹性项目 2</div> <div class="p-2 bg-primary">弹性项目 3</div> </div> </div> </body> </html>