如何替换嵌套对象中的键

const nestedObj = {
  a: 1,
  b: {
    c: 2,
    d: {
      e: 3
    }
  }
};

function replaceKeys(obj, oldKey, newKey) {
  if (Array.isArray(obj)) {
    return obj.map(item => replaceKeys(item, oldKey, newKey));
  } else if (typeof obj === 'object' && obj !== null) {
    const newObj = {};
    for (const key in obj) {
      if (obj.hasOwnProperty(key)) {
        const newKeyToUse = key === oldKey ? newKey : key;
        newObj[newKeyToUse] = replaceKeys(obj[key], oldKey, newKey);
      }
    }
    return newObj;
  }
  return obj;
}

const nestedObj = {
  a: 1,
  b: {
    c: 2,
    d: {
      e: 3
    }
  }
};

const updatedObj = replaceKeys(nestedObj, 'e', 'f');
console.log(updatedObj);