代码示例：（标识：bs_offcanvas_end）
<!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.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/js/bootstrap.bundle.js"></script>
</head>
<body>
<div class="offcanvas offcanvas-end" id="demo">
<div class="offcanvas-header">
<h1 class="offcanvas-title">Heading</h1>
<button type="button" class="btn-close" data-bs-dismiss="offcanvas"></button>
</div>
<div class="offcanvas-body">
<p>一些文本。一些文本。一些文本。</p>
<p>一些文本。一些文本。一些文本。</p>
<p>一些文本。一些文本。一些文本。</p>
<button class="btn btn-secondary" type="button">按钮</button>
</div>
</div>
<div class="container-fluid mt-3">
<h3>Right Offcanvas</h3>
<p>.offcanvas-end 类将 offcanvas 定位到页面的右侧。</p>
<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#demo">
切换右侧的 Offcanvas
</button>
</div>
</body>
</html>
