jquery 下拉菜单联动

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>jQuery 下拉菜单联动</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
    <select id="category">
        <option value="">请选择分类</option>
        <option value="fruit">水果</option>
        <option value="vegetable">蔬菜</option>
    </select>

    <select id="item">
        <option value="">请选择项目</option>
    </select>

    <script>
        $(document).ready(function() {
            var items = {
                fruit: ["苹果", "香蕉", "橙子"],
                vegetable: ["胡萝卜", "西红柿", "黄瓜"]
            };

            $('#category').change(function() {
                var category = $(this).val();
                var $itemSelect = $('#item');
                $itemSelect.empty();
                $itemSelect.append('<option value="">请选择项目</option>');

                if (category && items[category]) {
                    $.each(items[category], function(index, value) {
                        $itemSelect.append('<option value="' + value + '">' + value + '</option>');
                    });
                }
            });
        });
    </script>
</body>
</html>