export interface State {
    items: Items[]
}

const defaultState = {
    items: []
};

const _store = new BehaviorSubject<State>(defaultState);

@Injectable()
export class Store {
    private _store = _store;
    changes = this._store.distinctUntilChanged()
        .do(() => console.log('changes'));

    setState(state: State) {
        this._store.next(state);
    }

    getState() : State {
        return this._store.value;
    }

    purge() {
        this._store.next(defaultState);
    }
}

当我运行我的项目时,我在我的控制台中收到此错误

platform-browser.umd.js:1900 EXCEPTION: Error: Uncaught (in promise):
EXCEPTION: Error during instantiation of Store! (StoreHelper -> Store).
ORIGINAL EXCEPTION: TypeError: this._store.distinctUntilChanged is not a function

谁能帮我吗.此外,如果我想要做的是为我的模型对象创建一个商店,所以如果有任何其他更简单的方式随时建议它.

任何帮助表示赞赏.