ReferenceError：未定义localStorage

Question

我正在尝试使用Angular和ASP.NET Core进行用户身份验证。

我正在按照此处的教程进行操作：

https://fullstackmark.com/post/10/user-authentication-with-angular-and-asp-net-core

我按照所有步骤进行了操作，没​​有任何错误。

应用运行，但是当我去＆＃34; /注册＆＃34;或＆＃34; / login＆＃34;路线，我得到

NodeInvocationException: Uncaught (in promise): ReferenceError: localStorage is not defined
ReferenceError: localStorage is not defined

使用它的服务是：

import { Injectable, Inject } from '@angular/core';
import { Http, Response, Headers, RequestOptions } from '@angular/http';

import { UserRegistration } from '../shared/models/user.registration.interface';
import { ConfigService } from '../shared/utils/config.service';

import { BaseService } from "./base.service";

import { Observable } from 'rxjs/Rx';
import { BehaviorSubject } from 'rxjs/Rx';

//import * as _ from 'lodash';

// Add the RxJS Observable operators we need in this app.
import '../rxjs-operators';

@Injectable()
export class UserService extends BaseService {

  baseUrl: string = '';

  // Observable navItem source
  private _authNavStatusSource = new BehaviorSubject<boolean>(false);
  // Observable navItem stream
  authNavStatus$ = this._authNavStatusSource.asObservable();

  private loggedIn = false;

  constructor(private http: Http, private configService: ConfigService) {
    super();
    this.loggedIn = !!localStorage.getItem('auth_token');
    // ?? not sure if this the best way to broadcast the status but seems to resolve issue on page refresh where auth status is lost in
    // header component resulting in authed user nav links disappearing despite the fact user is still logged in
    this._authNavStatusSource.next(this.loggedIn);
    this.baseUrl = configService.getApiURI();
  }

    register(email: string, password: string, firstName: string, lastName: string,location: string): Observable<UserRegistration> {
    let body = JSON.stringify({ email, password, firstName, lastName,location });
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });

    return this.http.post(this.baseUrl + "/accounts", body, options)
      .map(res => true)
      .catch(this.handleError);
  }  

   login(userName: any, password: any) {
    let headers = new Headers();
    headers.append('Content-Type', 'application/json');

    return this.http
      .post(
      this.baseUrl + '/login',
      JSON.stringify({ userName, password }),{ headers }
      )
      .map(res => res.json())
      .map(res => {
        localStorage.setItem('auth_token', res.auth_token);
        this.loggedIn = true;
        this._authNavStatusSource.next(true);
        return true;
      })
      .catch(this.handleError);
  }

  logout() {
    localStorage.removeItem('auth_token');
    this.loggedIn = false;
    this._authNavStatusSource.next(false);
  }

  isLoggedIn() {
    return this.loggedIn;
  }  
}

注册ts是：

import { Component, OnInit, Inject } from '@angular/core';
import { Router } from '@angular/router';

import { UserRegistration } from '../../shared/models/user.registration.interface';
import { UserService } from "../../services/user.service";

declare var localStorage: any;

@Component({
  selector: 'app-registration-form',
  templateUrl: './registration-form.component.html'
})
export class RegistrationFormComponent implements OnInit {

 errors: string;  
 isRequesting: boolean;
 submitted: boolean = false;

 constructor(private userService: UserService, private router: Router) { 

 }

  ngOnInit() {

  }

  registerUser({ value, valid }: { value: UserRegistration, valid: boolean }) {
     this.submitted = true;
     this.isRequesting = true;
     this.errors='';
     if(valid)
     {
         this.userService.register(value.email,value.password,value.firstName,value.lastName,value.location)
                   .finally(() => this.isRequesting = false)
                   .subscribe(
                     result  => {if(result){
                         this.router.navigate(['/login'],{queryParams: {brandNew: true,email:value.email}});                         
                     }},
                     errors =>  this.errors = errors);
     }      
  }  
}

登录名是：

import { Subscription } from 'rxjs';
import { Component, OnInit,OnDestroy } from '@angular/core';
import { Router, ActivatedRoute } from '@angular/router';

import { Credentials } from '../../shared/models/credentials.interface';
import { UserService } from '../../services/user.service';

@Component({
  selector: 'app-login-form',
  templateUrl: './login-form.component.html'
})
export class LoginFormComponent implements OnInit, OnDestroy {

  private subscription: Subscription;

  brandNew: boolean;
  errors: string;
  isRequesting: boolean;
  submitted: boolean = false;
  credentials: Credentials = { email: '', password: '' };

  constructor(private userService: UserService, private router: Router,private activatedRoute: ActivatedRoute) { }

    ngOnInit() {

    // subscribe to router event
    this.subscription = this.activatedRoute.queryParams.subscribe(
      (param: any) => {
         this.brandNew = param['brandNew'];   
         this.credentials.email = param['email'];         
      });      
  }

   ngOnDestroy() {
    // prevent memory leak by unsubscribing
    this.subscription.unsubscribe();
  }

  login({ value, valid }: { value: Credentials, valid: boolean }) {
    this.submitted = true;
    this.isRequesting = true;
    this.errors='';
    if (valid) {
      this.userService.login(value.email, value.password)
        .finally(() => this.isRequesting = false)
        .subscribe(
        result => {         
          if (result) {
             this.router.navigate(['/home']);             
          }
        },
        error => this.errors = error);
    }
  }
}

我尝试了以下解决方案：

localStorage is not defined (Angular Universal)

但它不起作用......

我缺少什么

Answer 1

标准localStorage API  应该可以使用。

无需申报。

设置 localStorage.setItem('name', 'storingSomething');

得到 localStorage.getItem('name');

Answer 2

您可以使用标准API进行本地存储，例如

localStorage.setItem(k, v)

和

localStorage.getItem(k)

但是如果你想要一个有角度的解决方案并为本地存储找到一个好的库，那么我正在使用的是

https://github.com/marcj/angular2-localstorage

也

https://www.npmjs.com/package/angular2-cool-storage

使用起来很酷。

Answer 3

将localStorage.getItem(...)放在`ComponentDidMount（）``上