如何从我在typescript中创建的类型中获取密钥

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

type MyTypeKeys = keyof MyType; // "name" | "age" | "email"

function getKey(obj: MyType, key: MyTypeKeys) {
  return obj[key];
}

const myObj: MyType = {
  name: "John",
  age: 25,
  email: "john@example.com",
};

const nameValue = getKey(myObj, "name"); // "John"
const ageValue = getKey(myObj, "age"); // 25
const emailValue = getKey(myObj, "email"); // "john@example.com"