问Javascript:如何在不创建循环依赖的情况下重用创建子实例的方法

EN

abstract class Fruit {
    private content: Fruit[] = [];

    addChild() {
        // Pick one at random (using this as an example instead of the actual criteria that determines this)
        const type = pickOne(['apple', 'banana', 'cherry']);

        switch (type) {
            case 'apple':
                this.content.push(new Apple());
            case 'banana':
                this.content.push(new Banana());
            case 'cherry':
                this.content.push(new Cherry());
        }
    }
}

class Apple extends Fruit { }

class Banana extends Fruit { }

class Cherry extends Fruit { }