如何合并具有相同键、值对的数组

function mergeArrays(...arrays) {
  let result = [];

  arrays.forEach((arr) => {
    arr.forEach((obj) => {
      const { key, value } = obj;
      const existingObj = result.find((item) => item.key === key && item.value === value);

      if (!existingObj) {
        result.push(obj);
      }
    });
  });

  return result;
}

// 示例用法
const array1 = [{ key: 'a', value: 1 }, { key: 'b', value: 2 }];
const array2 = [{ key: 'b', value: 2 }, { key: 'c', value: 3 }];
const array3 = [{ key: 'c', value: 3 }, { key: 'd', value: 4 }];

const mergedArray = mergeArrays(array1, array2, array3);
console.log(mergedArray);