Angular Why can't subscribe subscribe to the value?

app.component.ts

import { Component } from "@angular/core";
import { AppService } from "./service/app.service";

@Component({
  selector: "app-root",
  templateUrl: "./app.component.html",
  styleUrls: ["./app.component.css"]
})
export class AppComponent {
    constructor(private service : AppService){
        this.service.appStore.subscribe(state => {
            console.log(state);
        })
    }

    ngOnInit(){
      this.service.getData();
    }
    testClick(){
      console.log("111")
      
    }
}

app.service.ts

import { Data } from "../mock/data";
import { Person } from "../models/person";
import { Observable } from "rxjs/Observable";
import { Store } from "@ngrx/store";
import { AppState, createAppState } from "../app.state";
import { AppAction } from "../actions/app.action";
import { Injectable } from "@angular/core";

@Injectable()
export class AppService{
      appStore: Store<AppState>;
      constructor(private store : Store<any>){
            this.appStore = this.store.select(createAppState);
      }

      getData() {
            this.store.dispatch(new AppAction({
                  data : Data
            }));
      }

      

}

app.state.ts

import { createFeatureSelector, createSelector } from "@ngrx/store";
import { Person } from "./models/person";

export class AppState {
      entity : Array<Person> = [];
}

export const getAppState = createFeatureSelector<AppState>("app");
export const createAppState = createSelector(
      getAppState,
      (state: AppState) => new AppState()
)

app.reducer.ts

import { AppState } from "../app.state";
import { AppAction } from "../actions/app.action";

export function appReducer(
      state = new AppState(),
      action : AppAction
) {
      switch(action.type){
            case "appAction" : {
                  let s = new AppState();
                  console.log(action.payload.data)
                  s.entity = action.payload.data;
                  return s;
            }
            default: {
                  return new AppState();
            }
      }

}

app.action.ts

import { Action } from "@ngrx/store";
import { Person } from "../models/person";

export class AppAction implements Action{
      type = "appAction";
      constructor(
            public payload :{
                  data : Array<Person>
            }
      ){
      }
}

Why can"t you subscribe to the value sent by action. Entity is an empty array, and the switch of reducer can clearly print out the value.

The createAppState in

app.state.ts is always returning a new new object.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bf365e-315ef.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf365e-315ef.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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