返回嵌套对象中的结果

function getValueFromNestedObject(obj, keys) {
  if (typeof obj !== 'object' || obj === null) {
    return undefined;
  }

  const keyArr = keys.split('.');
  let result = obj;

  for (let i = 0; i < keyArr.length; i++) {
    const key = keyArr[i];
    result = result[key];

    if (result === undefined) {
      return undefined;
    }
  }

  return result;
}

// 示例嵌套对象
const nestedObject = {
  foo: {
    bar: {
      baz: 'Hello, World!'
    }
  }
};

// 调用函数获取结果
const result = getValueFromNestedObject(nestedObject, 'foo.bar.baz');
console.log(result); // 输出：Hello, World!