jquery二级折叠菜单

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery 二级折叠菜单</title>
    <style>
        .menu {
            list-style: none;
            padding: 0;
        }
        .menu li {
            cursor: pointer;
        }
        .submenu {
            display: none;
            list-style: none;
            padding-left: 20px;
        }
    </style>
</head>
<body>
    <ul class="menu">
        <li>菜单1
            <ul class="submenu">
                <li>子菜单1-1</li>
                <li>子菜单1-2</li>
            </ul>
        </li>
        <li>菜单2
            <ul class="submenu">
                <li>子菜单2-1</li>
                <li>子菜单2-2</li>
            </ul>
        </li>
    </ul>

    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <script>
        $(document).ready(function() {
            $('.menu > li').click(function() {
                $(this).find('.submenu').slideToggle();
                $(this).siblings().find('.submenu').slideUp();
            });
        });
    </script>
</body>
</html>