訪問器

在此示例中，我們修改 Simple class 示例以允許訪問 speed 屬性。Typescript 訪問器允許我們在 getter 或 setter 中新增其他程式碼。

class Car {
    public position: number = 0;
    private _speed: number = 42;
    private _MAX_SPEED = 100
    
    move() {
        this.position += this._speed;
    }
    
    get speed(): number {
        return this._speed;
    }

    set speed(value: number) {
        this._speed = Math.min(value, this._MAX_SPEED);
    }
}

let car = new Car();
car.speed = 120;
console.log(car.speed);  // 100