循环复杂的JSON对象

function parseJSON(json) {
  if (typeof json !== 'object') {
    return json;
  }

  const result = {};

  for (const key in json) {
    if (json.hasOwnProperty(key)) {
      const value = json[key];

      if (typeof value === 'object') {
        result[key] = parseJSON(value);
      } else {
        result[key] = value;
      }
    }
  }

  return result;
}

const json = {
  name: 'John',
  age: 30,
  address: {
    city: 'New York',
    state: 'NY',
    zip: '10001',
    country: {
      name: 'USA',
      capital: 'Washington D.C.',
    },
  },
};

const parsedJSON = parseJSON(json);
console.log(parsedJSON);