统计object数组中的重复数，并按数组或object键分组

function countAndGroupObjects(objects, key) {
  // 统计每个object的出现次数
  const countMap = {};
  objects.forEach(obj => {
    const objKey = obj[key];
    countMap[objKey] = countMap[objKey] ? countMap[objKey] + 1 : 1;
  });

  // 根据数组或object键分组
  const groupMap = {};
  objects.forEach(obj => {
    const objKey = obj[key];
    if (groupMap[objKey]) {
      groupMap[objKey].push(obj);
    } else {
      groupMap[objKey] = [obj];
    }
  });

  return {
    countMap,
    groupMap
  };
}

// 示例用法
const objects = [
  { id: 1, name: 'A' },
  { id: 2, name: 'B' },
  { id: 3, name: 'A' },
  { id: 4, name: 'C' },
  { id: 5, name: 'B' },
  { id: 6, name: 'A' }
];

const result = countAndGroupObjects(objects, 'name');
console.log(result.countMap); // 输出：{ A: 3, B: 2, C: 1 }
console.log(result.groupMap); // 输出：{ A: [ { id: 1, name: 'A' }, { id: 3, name: 'A' }, { id: 6, name: 'A' } ], B: [ { id: 2, name: 'B' }, { id: 5, name: 'B' } ], C: [ { id: 4, name: 'C' } ] }