angular2-服務價值不變

Question

我有一條叫做家的路線，它有三個子路線，文件，郵件和垃圾箱。 在本地路由組件中，它具有一個名為“ myUser”的變量。 我創建了一個服務，以便他們都可以共享myUser值，但是由於某些原因，服務變量值不會更改。
服務

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

@Injectable()
export class HomeService {
  // Mock user, for testing  
  myUser = {name:"John", loggedIn:true};

  setUser(name:string){
    this.myUser.name = name ; 
  }

  isLogged():boolean {
    if(this.myUser.loggedIn == true){
      return true ; 
    }
    return false ; 
  }
} 

家（父路線）

import { Component } from '@angular/core';
import { Router, ROUTER_DIRECTIVES } from '@angular/router';
import { CORE_DIRECTIVES, FORM_DIRECTIVES } from '@angular/common';
import { Http, Headers } from '@angular/http';
import { contentHeaders } from '../common/headers';

import { HomeService } from '../../home.service';


const template = require('./home.component.html');
const styles = require('./home.component.css');

@Component({
  selector: 'home',
  directives: [ CORE_DIRECTIVES, FORM_DIRECTIVES ],
  template: template,
  styles: [ styles ],
  providers: [HomeService]
})

export class HomeComponent {
  constructor(public router: Router, private homeService: HomeService) {

  }
  myUser = this.homeService.myUser ; 

  setUser(name:string){
    this.homeService.setUser(name); 
  }

  // Is logged in
  isLogged():boolean {
    return this.homeService.isLogged(); 
  }
}

郵件（子路線）

import { Component } from '@angular/core';
import { Router } from '@angular/router';
import { CORE_DIRECTIVES, FORM_DIRECTIVES } from '@angular/common';
import { HomeService } from '../../home.service';


const template = require('./mail.component.html');
const styles = require('./mail.component.css');

@Component({
  selector: 'mail',
  directives: [ CORE_DIRECTIVES, FORM_DIRECTIVES ],
  template: template,
  styles: [ styles ],
  providers: [HomeService]
})

export class MailComponent {
  constructor(public router: Router, private homeService: HomeService) {

  }

  myUser = this.homeService.myUser ; 

  setUser(name:string){
    this.homeService.setUser(name); 
  }
}

Answer 1

您必須將HomeService注入到Dependency數組或MainComponent提供bootstrap功能中，以便該服務僅實例化一次。

bootstrap(MainComponent, [HomeService, ....other dependency...])

然后從兩個組件元數據的providers數組中刪除HomeService 。