代码示例：（标识：bs_form_input_group_btn）
<!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="p-4">
<h3>输入组按钮</h3>
<div class="input-group mb-3 mt-3">
<button class="btn btn-outline-primary" type="button">基础按钮</button>
<input type="text" class="form-control" placeholder="一些文本">
</div>
<div class="input-group mb-3">
<input type="text" class="form-control" placeholder="搜索">
<button class="btn btn-success" type="submit">Go</button>
</div>
<div class="input-group mb-3">
<input type="text" class="form-control" placeholder="一些文本">
<button class="btn btn-primary" type="button">OK</button>
<button class="btn btn-danger" type="button">Cancel</button>
</div>
</div>
</body>
</html>
