因此，如果您想从一个效果中分派多个动作，则可以返回一系列动作并将map替换为mergeMap：

@Effect()
uploadSpecChange$: Observable<Action> = this.actions$.pipe(
    ofType(AppActions.WorkspaceActionTypes.UploadChange),switchMap((x: any) => {
        let f = new FileReader();
        f.readAsText(x.payload);
        return fromEvent(f,'load');
    }),mergeMap((result: any) => {
        const raw = (<FileReader>result.target).result as string;
        const res = JSON.parse(raw);
        // console.log(res);
        return [
            new AppActions.UploadComplete(res),new AppActions.PerformCalc()
        ];
    })
);

但是，如果希望在完成PerformCalc操作后立即分派UploadComplete操作，则应分派PerformCalc作为UploadComplete的副作用：>

@Effect()
uploadSpecChange$: Observable<Action> = this.actions$.pipe(
    ofType(AppActions.WorkspaceActionTypes.UploadChange),map((result: any) => {
        const raw = (<FileReader>result.target).result as string;
        const res = JSON.parse(raw);
        // console.log(res);
        return new AppActions.UploadComplete(res);
    })
);

@Effect()
uploadComplete$: Observable<Action> = this.actions$.pipe(
    ofType(AppActions.WorkspaceActionTypes.UploadComplete),map(() => new AppActions.PerformCalc())
);

如果有多个操作，则返回@Effect，

您需要使用concatMap而不是map

concatMap((result: any) => {
    const raw = (<FileReader>result.target).result as string;
    const res = JSON.parse(raw);
    return [
        new AppActions.UploadComplete(res),new AppActions.PerformCalc()
    ]
})

您可以使用操作符的switchMap＆来做到这一点

@Effect()
dispatchMultiAction$: Observable<Action> = this.actions$.pipe(
    ofType<SomeAction.Dispatch>(someActions.Dispatch),switchMap(_ =>
        of(
            new someActions.InitData(),new someActions.GetData(),new someActions.LoadData()
        )
    )
);