两种方案：1、session、watchCurrentCustomer().subscribe(data => {});订阅机制；2、events机制.下面将以代码重现

方案一：

import {Injectable} from '@angular/core';

import 'rxjs/Rx';

import {LocalStorage, Storage} from "ionic-angular/index";

import {Subject} from "rxjs/Subject";

import {Customer} from "../models/Customer";

import {BehaviorSubject} from "rxjs/BehaviorSubject";

import {Observable} from "rxjs/Observable";

@Injectable() export class XXXXXSession extends Observable<Customer>{ private local:Storage; private currentCustomer:Subject<Customer> = new BehaviorSubject<Customer>(null); private customer; private residence;

constructor(appConfig:AppConfig) {this.local = new Storage(LocalStorage);this.local.get('Customer').then(cust=> {console.info(cust);if (cust != null) {this.login = true;this.customer = JSON.parse(cust);}});this.local.get('Residence').then(residence=> {console.info(residence != null);if (residence != "") {this.residence = JSON.parse(residence);}});
}
isLogin() {return this.login;
}
getCustomer() {return this.customer;
}
setCustomer(customer) {this.currentCustomer.next(customer);this.local.set('Customer', JSON.stringify(customer));this.login = true;
}getCustomerId() {if (this.customer != null) {return this.customer.customerId;}return 1;
}
getResidence() {return this.residence;
}
getResidenceId() {if (this.residence != null) {return this.residence.residenceId;}return 1;
}
setResidence(residence) {this.local.set('Residence', JSON.stringify(residence));this.residence = residence;
}

}

监听者： XXXXSession.watchCurrentCustomer().subscribe(data => {});

 XXXXSession.watchCurrentCustomer().subscribe(data => {if(data == null){this.portrait = "img/not_login.png";this.isShop = false;this.customer = null;this.nickName = null;}else {this.customer = data.customer;this.nickName = this.customer.nickName;this.portrait = data.customer.portrait;this.queryCustomerShop(this.customer.customerId);}});XXXXSession.watchCurrentResidence().subscribe((newResidence) => {if(newResidence!=null){this.defaultResidence=newResidence.residenceName;}else{}});}

方案二、Events机制 import 'rxjs/Rx';

import {LocalStorage, Storage, Events} from "ionic-angular/index";

@Injectable() export class CustomerSession {

private static local:Storage = new Storage(LocalStorage);private static customer;private static residence;constructor(public events:Events) {}initSession() {CustomerSession.local.get('Customer').then(cust=> {if (cust != null) {CustomerSession.customer = JSON.parse(cust);this.events.publish("Customer:changed", CustomerSession.customer);}});CustomerSession.local.get('Residence').then(residence=> {if (residence != null) {CustomerSession.residence = JSON.parse(residence);this.events.publish("Residence:changed", CustomerSession.residence);}});
}

}

其他地方监听： this.events.subscribe('Customer:changed', (eventData) => {

        if (eventData != null && eventData.length > 0) {this.customer = eventData[0];this.nickName = this.customer.nickName;this.portrait = this.customer.portrait;this.queryCustomerShop(this.customer.customerId);}else{this.portrait = "img/not_login.png";this.isShop = false;this.customer = null;this.nickName = "XXXX";}});this.events.subscribe('Residence:changed', (eventData) => {if (eventData != null && eventData.length > 0) {this.defaultResidence=eventData[0].residenceName;}});