ngrx/效果如何将参数从选择器解析为GET

import { Injectable } from '@angular/core';
import { Actions, createEffect, ofType } from '@ngrx/effects';
import { map, mergeMap } from 'rxjs/operators';
import { HttpClient } from '@angular/common/http';

@Injectable()
export class MyEffects {
  myEffect$ = createEffect(() =>
    this.actions$.pipe(
      ofType('MY_ACTION'), // 监听名为'MY_ACTION'的动作
      mergeMap(action =>
        this.myService.getSomeData(action.payload).pipe(
          map(response => ({ type: 'MY_ACTION_SUCCESS', payload: response }))
        )
      )
    )
  );

  constructor(
    private actions$: Actions,
    private myService: MyService,
  ) {}
}