根据key合并数组并将它们的值相加。Javascript/Es6/React

const mergeAndSumArrays = (arrays) => {
  const mergedObj = {};
  
  // 合并数组中的对象
  arrays.forEach((array) => {
    array.forEach((obj) => {
      const key = obj.key;
      const value = obj.value;
      
      if (mergedObj.hasOwnProperty(key)) {
        mergedObj[key] += value;
      } else {
        mergedObj[key] = value;
      }
    });
  });
  
  // 将合并后的对象转换为数组
  const mergedArray = Object.keys(mergedObj).map((key) => {
    return { key: key, value: mergedObj[key] };
  });
  
  return mergedArray;
};

// 示例用法
const arrays = [
  [{ key: 'a', value: 1 }, { key: 'b', value: 2 }],
  [{ key: 'a', value: 3 }, { key: 'c', value: 4 }],
  [{ key: 'b', value: 5 }, { key: 'd', value: 6 }]
];

const mergedAndSummedArray = mergeAndSumArrays(arrays);
console.log(mergedAndSummedArray);