1. 确保您已经正确地注入了 Store 服务。在组件/服务中注入 Store 的方式如下所示：

import { Component } from '@angular/core';
import { Store } from '@ngxs/store';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html'
})
export class AppComponent {

  constructor(private store: Store) {}

  //...

}

2. 确保您已经正确地定义了状态。例如，下面是一个简单的状态定义示例：

import { State, Action, StateContext } from '@ngxs/store';

export class Increment {
  static readonly type = '[Counter] Increment';
}

export class Decrement {
  static readonly type = '[Counter] Decrement';
}

// 定义状态模型
export interface CounterStateModel {
  count: number;
}

@State({
  name: 'counter',
  defaults: {
    count: 0
  }
})
export class CounterState {

  // 注册 action
  @Action(Increment)
  increment(ctx: StateContext) {
    const state = ctx.getState();
    ctx.patchState({
      count: state.count + 1
    });
  }

  @Action(Decrement)
  decrement(ctx: StateContext) {
    const state = ctx.getState();
    ctx.patchState({
      count: state.count - 1
    });
  }

}

3. 在组件/服务中调用 select 方法以获取状态的当前值。例如，下面的组件示例演示了如何在 Angular 模板中显示状态：

import { Component, OnInit } from '@angular/core';
import { Store } from '@ngxs/store';
import { Observable } from 'rxjs';

interface CounterStateModel {
  count: number;
}

@Component({
  selector: 'app-counter',
  template: `
    Increment
    Decrement
    
Current count: {{ count$ | async }}
  `
})
export class CounterComponent implements OnInit