:string; }interfaceAnimal{year:string; }classHuman{name:string='';// age: number | undefined;age?:number; }// 先 extends 一个 class, 再 implements 多个 interfaces ✅classPersonextendsHumanimplementsAnimal,UFO{name:string;age:number;year:string; wtf?:string;constructor(options: { name:string...
ts 中 extends 和 implementsts 中 extends 可以理解为 es6 class 对应的 extends可以实现类的继承 class Son extends Father {}可以实现和接口的继承 {代码...
interface Animal name: string;interface Dog extends Animal breed: string;而type用交叉类型来扩展:type Animal = name: string;type Dog = Animal & breed: string;当需要定义联合类型或元组时,type的优势就显现了。比如定义个响应类型:type Response = Success | Error;type Coordinate = [number, number];...
extends用来继承类,implements用来实现一个接口 extends案例 interface Person{ money:number } //implements是对某个接口的实现,必须满足接口的类型规范 class Father implements Person { publ...
interface Data_1 { name: string, age: number, } let data_1: Data_1 = { name: "hello", age: 20, } console.log(data_1); // 方式2 interface Data_2 { name: string; age: number; // 可选属性, 表示可以选择不赋值, 该属性也可以用在作为函数参数使用 ...
在TypeScript中,type和interface的主要区别如下:核心作用:interface:主要用于描述对象的结构,不适用于基础类型。type:是类型别名,可以声明任意类型,包括基础类型、联合类型和元组等。扩展性和灵活性:interface:可以通过extends实现继承,但在处理元组时相对复杂。type:使用&符号实现交叉类型,更为直接和...
interface 可以而 type 不行 总结 interface VS type 大家使用 typescript 总会使用到 interface 和 type,官方规范 稍微说了下两者的区别 An interface can be named in an extends or implements clause, but a type alias for an object type literal cannot. An interface can have multiple merged declarati...
interface Thing { get size(): number set size(value: number | string | boolean); } 1. 2. 3. 4. 5. 使用不同类型来读和写属性时存在一个限制,那就是读属性的类型必须可分配给你正在编写的类型,换句话说,getter 类型必须可以分配给 setter。这就保证了一定程度的一致性,于是属性总是能分配给自身了...
interface Change { uid: string; type: string; } interface SomeChangeExtension { type: 'some'; foo: number; } interface SomeChange extends Change, SomeChangeExtension { } In this example, I was expecting SomeChange to have a type equivale...
interface Shape { color: string; } Now, consider the following ways to add additional properties to this type: Extension interface Square extends Shape { sideLength: number; } Intersection type Square = Shape & { sideLength: number; } What is the difference between both approaches? And,...