如何同时调度多个ngrx操作

import { ofType } from '@ngrx/effects';
import { mergeMap } from 'rxjs/operators';
import { Store } from '@ngrx/store';
import { Injectable } from '@angular/core';

@Injectable()
export class MyEffects {
  constructor(
    private actions$: Actions,
    private store: Store<State>
  ) {}

  loadMultipleActions$ = this.actions$.pipe(
    ofType('[My Component] Load Multiple Actions'),
    mergeMap(() => [
      this.store.dispatch(loadAction1()),
      this.store.dispatch(loadAction2()),
      this.store.dispatch(loadAction3())
    ])
  );
}

import { catchError } from 'rxjs/operators';
import { of } from 'rxjs';

@Injectable()
export class MyEffects {
  constructor(
    private actions$: Actions,
    private store: Store<State>
  ) {}

  loadMultipleActions$ = this.actions$.pipe(
    ofType('[My Component] Load Multiple Actions'),
    mergeMap(() => [
      this.store.dispatch(loadAction1()),
      this.store.dispatch(loadAction2()),
      this.store.dispatch(loadAction3()).pipe(
        catchError(error => {
          console.error('Error loading action3', error);
          return of({ type: '[My Component] Load Action3 Failure', payload: error });
        })
      )
    ])
  );
}