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...
// 创建一个用户类并实现用户接口classPersonimplementsUser{name:string;// 类中的名字属性age:number;// 类中的年龄属性// 构造函数constructor(name:string,age:number){this.name=name;// 给名字赋值this.age=age;// 给年龄赋值}// 实现 greet 方法greet():void{console.log(`Hello, my name is${this...
接口可以被extends和implements。 代码示例: // 类型别名 type Name = string; type UserInfo = { name: Name; age: number; }; // 接口 interface IPerson { name: string; greet(phrase: string): void; } class Person implements IPerson { name: string; constructor(name: string) { this.name = ...
类也可以实现多个接口,例如class C implements A, B {。 注意事项 重要的是要理解implements子句只是检查类可以被视为接口类型。 它根本不会改变类的类型或其方法。 一个常见的错误来源是假设implements子句会改变类类型 - 它不会! interface Checkable { check(name: string): boolean; } class NameChecker imple...
interface myInterf { name: string; sayHello(): void; } class Person implements myInterf {...
interface PointLike { x: number; y: number; } class Point implements PointLike { x: number; y: number; constructor(x: number, y: number) { this.x = x; this.y = y; } distanceFromOrigin() { return Math.sqrt(this.x ** 2 + this.y ** 2); } static [Symbol.hasInstance](val:...
type ValueOrArray<T> = T | ArrayOfValueOrArray<T>; interface ArrayOfValueOrArray<T> extends Array<ValueOrArray<T>> {} Because interfaces (and other object types) introduce a level of indirection and their full structure doesn’t need to be eagerly built out, TypeScript has no problem...
I'm getting the following compiler error using TypeScript 1.4.1: error TS2420: Class 'WorkerFS' incorrectly implements interface 'FileSystem'. Unfortunately, TypeScript does not tell me what property or method is incorrectly implemented/...
I've amended the example slightly to not emit an empty runtime object: type THIS_MODULE = typeof import('./commands'); type TYPE_CHECK<T extends CommandsModuleInterface> = T; declare const _: TYPE_CHECK<THIS_MODULE>; 🎉2 lorenzodallavecchia commented on Dec 2, 2022 lorenzodalla...
interfaceState{name:string;capital:string;}conststates:State[]=[{name:'Alabama',capitol:'Montgomery'},// ~~~{name:'Alaska',capitol:'Juneau'},// ~~~{name:'Arizona',capitol:'Phoenix'},// ~~~ Object literal may only specify known// properties, but 'capitol' does not exist in type/...