<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</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">
<h2>选择菜单</h2>
<p>如需在 Bootstrap 5 中设置选择菜单的样式，请将 .form-select 类添加到 select 元素：</p>
<form action="/action_page.php">
<label for="sel1" class="form-label">选择菜单（选择一项）：</label>
<select class="form-select" id="sel1" name="sellist1">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
</select>
<br>
<label for="sel2" class="form-label">多选菜单（按住 ctrl 或 shift（或用鼠标拖动）可选择多个）：</label>
<select multiple class="form-select" id="sel2" name="sellist2">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
<button type="submit" class="btn btn-primary mt-3">提交</button>
</form>
</div>
</body>
</html>
