小编And*_*rew的帖子

我正在尝试使用服务的策略模式，但是我尝试用作策略上下文的模块似乎只坚持两者之一。这是示例代码：

动物模块.ts

@Module({})
export class AnimalModule {
    static register(strategy): DynamicModule {
        return {
            module: AnimalModule,
            providers: [{ provide: 'STRATEGY', useValue: strategy }, AnimalService],
            imports: [],
            exports: [AnimalService]
        };
    }
}

动物服务.ts

@Injectable()
export class AnimalService {
    constructor (@Inject('STRATEGY') private strategy) {
        this.strategy = strategy
    }

    public makeSound() {
        return this.strategy.makeSound()
    }
}

猫模块.ts

@Module({
    imports: [
        AnimalModule.register(catStrategy),
    ],
    controllers: [CatController],
    providers: [CatService],
})
export class CatModule {}

猫服务.ts

@Injectable()
export class CatService {
    constructor(
        private readonly animalService: AnimalService,
    ) {} …