获取值为数组的对象数组中的所有键

const objectArray = [
  { a: 1, b: 2 },
  { b: 3, c: 4 },
  { a: 5, c: 6 }
];

const allKeys = objectArray.reduce((keys, obj) => {
  return keys.concat(Object.keys(obj));
}, []);

console.log(allKeys); // 输出: ['a', 'b', 'b', 'c', 'a', 'c']

const uniqueKeys = [...new Set(allKeys)];
console.log(uniqueKeys); // 输出: ['a', 'b', 'c']

function getAllKeys(obj) {
  return Object.keys(obj).reduce((keys, key) => {
    keys.push(key);
    if (typeof obj[key] === 'object' && obj[key] !== null) {
      keys.push(...getAllKeys(obj[key]));
    }
    return keys;
  }, []);
}

const nestedObjectArray = [
  { a: 1, b: { c: 2, d: 3 } },
  { b: { c: 4 }, e: 5 }
];

const allNestedKeys = nestedObjectArray.reduce((keys, obj) => {
  return keys.concat(getAllKeys(obj));
}, []);

console.log(allNestedKeys); // 输出: ['a', 'b', 'c', 'd', 'b', 'c', 'e']