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<!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.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>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>