TypeScript:获取键值为T的属性的类型

type Person = {
  name: string;
  age: number;
  email: string;
};

type GetPropertyValue<T, K extends keyof T> = T[K];

const getProperty = <T, K extends keyof T>(obj: T, key: K): GetPropertyValue<T, K> => {
  return obj[key];
};

const person: Person = {
  name: "John",
  age: 30,
  email: "john@example.com",
};

const nameValue = getProperty(person, "name");
console.log(nameValue); // 输出 "John"

const ageValue = getProperty(person, "age");
console.log(ageValue); // 输出 30

const emailValue = getProperty(person, "email");
console.log(emailValue); // 输出 "john@example.com"