对嵌套对象数组进行排序

const data = [
  {
    name: 'John',
    age: 25,
    address: {
      city: 'New York',
      country: 'USA'
    }
  },
  {
    name: 'Alice',
    age: 30,
    address: {
      city: 'London',
      country: 'UK'
    }
  },
  {
    name: 'Bob',
    age: 20,
    address: {
      city: 'Paris',
      country: 'France'
    }
  }
];

data.sort((a, b) => a.age - b.age);

data.sort((a, b) => a.address.city.localeCompare(b.address.city));

data.sort((a, b) => {
  if (a.address.country === b.address.country) {
    return a.age - b.age;
  }
  return a.address.country.localeCompare(b.address.country);
});