TS实现一个简单的 pick 方法

function pick<T, U extends keyof T>(data: T, keys: U[]): { [K in U]: T[K] } {
  const obj: any = {};
  for (const key of keys) {
    obj[key] = data[key];
  }
  return obj;
}

const user = {
  name: 'Tom',
  age: 19,
};

pick(user, ['name', 'age']);