typescript-Record最佳实践，掌握了它offer拿到手软！！！

 语法示例：

type AnimalAges = Record<string, number>;
const ages: AnimalAges = {
   dog: 5,
   cat: 3,
   rabbit: 2,
};
console.log(ages.dog);
console.log(ages.cat);

 来一个难一点的：嵌套Record