代码示例：（标识：bs_button_styles）
<!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.min.js"></script>
</head>
<body>
<div style="padding:20px;">
<h2>按钮样式</h2>
<button type="button" class="btn">基础</button>
<button type="button" class="btn btn-primary">主要</button>
<button type="button" class="btn btn-secondary">次要</button>
<button type="button" class="btn btn-success">成功</button>
<button type="button" class="btn btn-info">信息</button>
<button type="button" class="btn btn-warning">警告</button>
<button type="button" class="btn btn-danger">危险</button>
<button type="button" class="btn btn-dark">深色</button>
<button type="button" class="btn btn-light">浅色</button>
<button type="button" class="btn btn-link">链接</button>
</div>
</body>
</html>
