📅  最后修改于: 2022-03-11 14:48:33.884000             🧑  作者: Mango
class Animal { name: string; constructor(theName: string) { this.name = theName; } move(distanceInMeters: number = 0) { console.log(`${this.name} moved ${distanceInMeters}m.`); }}
class Snake extends Animal { constructor(name: string) { super(name); } move(distanceInMeters = 5) { console.log("Slithering..."); super.move(distanceInMeters); }}
class Horse extends Animal { constructor(name: string) { super(name); } move(distanceInMeters = 45) { console.log("Galloping..."); super.move(distanceInMeters); }}
let sam = new Snake("Sammy the Python");let tom: Animal = new Horse("Tommy the Palomino");
sam.move();tom.move(34);Try