在javascript中从平面JSON创建嵌套json

function createNestedJsonFromFlatJson(flatJson) {
  const nestedJson = {};

  for (const key in flatJson) {
    const parts = key.split('.');
    let currentObj = nestedJson;

    for (let i = 0; i < parts.length; i++) {
      const part = parts[i];

      if (!currentObj.hasOwnProperty(part)) {
        currentObj[part] = {};
      } else if (typeof currentObj[part] !== 'object') {
        currentObj[part] = { value: currentObj[part] };
      }

      if (i === parts.length - 1) {
        currentObj[part] = flatJson[key];
      } else {
        currentObj = currentObj[part];
      }
    }
  }

  return nestedJson;
}

// 示例用法
const flatJson = {
  'person.name.first': 'John',
  'person.name.last': 'Doe',
  'person.age': 30,
  'person.address.city': 'New York',
  'person.address.country': 'USA'
};

const nestedJson = createNestedJsonFromFlatJson(flatJson);
console.log(nestedJson);

{
  person: {
    name: {
      first: 'John',
      last: 'Doe'
    },
    age: 30,
    address: {
      city: 'New York',
      country: 'USA'
    }
  }
}