TypeScript中interface和type的区别详解

interface Person {
  name: string;
  age: number;
}
type Car = {
  brand: string;
  year: number;
};

interface Animal {
  name: string;
  eat(): void;
}
interface Dog extends Animal { // 接口继承
  bark(): void;
}
class Labrador implements Dog { // 类实现接口
  name: string = 'Labrador';
  eat() {
    console.log('Labrador is eating');
  }
  bark() {
    console.log('Labrador is barking');
  }
}

interface Person {
  name: string;
}
interface Person { // 自动合并到一个类型声明
  age: number;
}
const person: Person = {
  name: 'John',
  age: 25,
};

type Person = {
  name: string;
};
type Person = { // 报错，无法重复定义类型 "Person"
  age: number;
};
const person: Person = {
  name: 'John',
  age: 25,
};

type ID = string | number; // 使用类型别名定义联合类型
type Person = {
  name: string;
  age: number;
};
type Student = Person & { grade: number }; // 使用交叉类型
type Config = {
  [key: string]: boolean;
}; // 使用映射类型