Question

我正在尝试使用以下方法检索状态信息：

this.store.select（state => console.log（state））;

不幸的是，我在某个地方犯了错误，我不知道在哪里，如果有人可以看到他，我将不胜感激。

下面，我将放置错误所在的代码，在此先感谢您提供的所有帮助。

[动作]：

import { IWindowParameters } from "../window-parameters.interface";

/* NgRx */
import { Action } from '@ngrx/store';

export enum AppWeatherActionTypes {
    SetCurrentWindowParameters = "[App] Set Current Window Parameters"
}

// Action Creators
export class SetCurrentWindowParameters implements Action {
    readonly type: string = AppWeatherActionTypes.SetCurrentWindowParameters;

    constructor(public payload: IWindowParameters) { }
}

export type AppWeatherActions = SetCurrentWindowParameters

[减速器]：

/* NgRx */
import { createFeatureSelector, createSelector } from '@ngrx/store';
import * as fromAction from "../actions/app-weather.action";
import { IWeatherAppState } from "../state/app-weather.state";


export const initialAppState: IWeatherAppState = {
    windowParameters: null
};


export function appReducer(state = initialAppState, action: fromAction.AppWeatherActions): IWeatherAppState {

    switch (action.type) {

        case fromAction.AppWeatherActionTypes.SetCurrentWindowParameters:
            return { ...state, windowParameters: { ...action.payload } }

    default:
        return state;
    }
}

[状态]

import { IWindowParameters } from "../window-parameters.interface";


export interface IWeatherAppState {
    windowParameters: IWindowParameters;
}

[app.module.ts]

/* NgRx */
import { StoreModule } from '@ngrx/store';
import { StoreDevtoolsModule } from '@ngrx/store-devtools';
import { environment } from '../environments/environment';
import { appReducer } from "./reducers/app-weather.reducer";

@NgModule({
  declarations: [
        AppWeather,
        WeatherMainScreen,
        WeatherView,
        WeatherPlugins,
        WeatherInfoPanel,
        MyHighlightDirective
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
      StoreModule.forRoot({ windowParameters: appReducer}),
    StoreDevtoolsModule.instrument({
        name: 'Weather Radar App DevTools',
        maxAge: 25,
        logOnly: environment.production,
    })
  ],
    providers: [
        WindowParametersService],
    bootstrap: [AppWeather]
})
export class AppModule { }

Answer 1

select函数会从您的状态中获取一个切片，该切片可以是字符串或对象。然后，该函数返回一个Observable，您可以subscribe向其返回。像这样：

this.store.select('pizzas').subscribe(console.log);

store.select（状态=>状态）状态未定义

1 个答案: