jquery左展开菜单

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery Left Expand Menu</title>
    <style>
        .menu {
            width: 200px;
            background-color: #f1f1f1;
            padding: 10px;
        }
        .menu-item {
            cursor: pointer;
            padding: 5px;
        }
        .sub-menu {
            display: none;
            padding-left: 20px;
        }
    </style>
</head>
<body>
    <div class="menu">
        <div class="menu-item">Menu 1</div>
        <div class="sub-menu">
            <div>Sub Menu 1.1</div>
            <div>Sub Menu 1.2</div>
        </div>
        <div class="menu-item">Menu 2</div>
        <div class="sub-menu">
            <div>Sub Menu 2.1</div>
            <div>Sub Menu 2.2</div>
        </div>
    </div>

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