如何根据key id合并Json对象？

{
  "1": { "name": "Alice", "age": 30 },
  "2": { "name": "Bob", "age": 25 }
}

{
  "1": { "age": 31, "city": "New York" },
  "2": { "age": 26, "city": "Los Angeles" }
}

function mergeJsonObjects(obj1, obj2) {
  let result = {};

  for (let key in obj1) {
    if (obj1.hasOwnProperty(key)) {
      result[key] = { ...obj1[key] };
    }
  }

  for (let key in obj2) {
    if (obj2.hasOwnProperty(key)) {
      if (result[key]) {
        // 如果result中已经有这个key，则合并对象
        result[key] = { ...result[key], ...obj2[key] };
      } else {
        // 如果result中没有这个key，则直接添加
        result[key] = { ...obj2[key] };
      }
    }
  }

  return result;
}

// 使用示例
const obj1 = {
  "1": { "name": "Alice", "age": 30 },
  "2": { "name": "Bob", "age": 25 }
};

const obj2 = {
  "1": { "age": 31, "city": "New York" },
  "2": { "age": 26, "city": "Los Angeles" }
};

const mergedObj = mergeJsonObjects(obj1, obj2);
console.log(mergedObj);

{
  "1": { "name": "Alice", "age": 31, "city": "New York" },
  "2": { "name": "Bob", "age": 26, "city": "Los Angeles" }
}