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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>默认显示折叠的内容</h2> <p>在 collapse 类旁边添加 show 类，可默认显示内容。</p> <p>单击按钮可在显示和隐藏内容之间切换。</p> <button type="button" class="btn btn-primary" data-bs-toggle="collapse" data-bs-target="#demo">春日</button> <div id="demo" class="collapse show"> <p>胜日寻芳泗水滨，无边光景一时新。</p> <p>等闲识得东风面，万紫千红总是春。</p> </div> </div> </body> </html>