如何按特定键合并数组中的项？

function mergeItemsByKey(arr, key) {
  let mergedItems = {};

  arr.forEach(item => {
    const keyValue = item[key];

    if (mergedItems.hasOwnProperty(keyValue)) {
      mergedItems[keyValue] = { ...mergedItems[keyValue], ...item };
    } else {
      mergedItems[keyValue] = item;
    }
  });

  return Object.values(mergedItems);
}

// 示例用法
const items = [
  { id: 1, name: 'Apple', category: 'Fruit' },
  { id: 2, name: 'Orange', category: 'Fruit' },
  { id: 3, name: 'Carrot', category: 'Vegetable' },
  { id: 4, name: 'Broccoli', category: 'Vegetable' }
];

const mergedItems = mergeItemsByKey(items, 'category');
console.log(mergedItems);

[
  { id: 1, name: 'Apple', category: 'Fruit' },
  { id: 2, name: 'Orange', category: 'Fruit' },
  { id: 3, name: 'Carrot', category: 'Vegetable' },
  { id: 4, name: 'Broccoli', category: 'Vegetable' }
]