1. 类与接口

接口（Interfaces）可以用于对【对象的形状（Shape）】进行描述。

2. 类实现接口

  1. interface Alarm {
  2.     alert(): void;
  3. }
  5. interface Light {
  6.     lightOn(): void;
  7.     lightOff(): void;
  8. }
  10. class Door {
  11.     public get material(): string {
  12.         return this.material;
  13.     }
  15.     public set material(v: string) {
  16.         this.material = v;
  17.     }
  18. }
  20. class SecurityDoor extends Door implements Alarm {
  21.     alert(): void {
  22.         console.log("Method not implemented.");
  23.     }
  24. }
  26. class Car implements Alarm , Light {
  27.     lightOn(): void {
  28.         throw new Error("Method not implemented.");
  29.     }
  30.     lightOff(): void {
  31.         throw new Error("Method not implemented.");
  32.     }
  33.     alert(): void {
  34.         throw new Error("Method not implemented.");
  35.     }
  36. }

3. 接口继承接口

  1. class Car implements Alarm , Light {
  2.     lightOn(): void {
  3.         throw new Error("Method not implemented.");
  4.     }
  5.     lightOff(): void {
  6.         throw new Error("Method not implemented.");
  7.     }
  8.     alert(): void {
  9.         throw new Error("Method not implemented.");
  10.     }
  11. }

4. 接口继承类

  1. class Point {
  2.     /**静态方法 */
  3.     static origin = new Point(0, 0);
  4.     /**
  5.      * 静态方法，计算与原点的距离
  6.      */
  7.     static distance(p2: Point, p1: Point = this.origin) {
  8.         return Math.sqrt((p2.x - p1.x) * (p2.x - p1.x) + (p2.y - p1.y) * (p2.y - p1.y));
  9.     }
  10.     x: number;
  11.     y: number;
  12.     constructor(x: number, y: number) {
  13.         this.x = x;
  14.         this.y = y;
  15.     }
  16.     print() {
  17.         console.log('x:' + this.x, 'y:' + this.y);
  18.     }
  19. }
  21. interface Point3D extends Point {
  22.     z: number;
  23.     print();
  24. }
  26. let point3D: Point3D = { x: 1, y: 2, z: 3 , print}
  27. console.log('point3D: ' + point3D)