Angular 4在出现错误401的情况下导航到登陆页

// auth.guard.ts

import { Injectable } from '@angular/core';
import { CanActivate, Router } from '@angular/router';

@Injectable()
export class AuthGuard implements CanActivate {
  constructor(private router: Router) {}

  canActivate(): boolean {
    // 检查用户是否已登录，例如通过检查本地存储中的令牌
    const isLoggedIn = localStorage.getItem('token') !== null;

    if (!isLoggedIn) {
      // 用户未登录，导航到登录页
      this.router.navigate(['/login']);
    }

    return isLoggedIn;
  }
}

// app.routing.ts

import { Routes, RouterModule } from '@angular/router';
import { AuthGuard } from './auth.guard';
import { LoginComponent } from './login.component';
import { HomeComponent } from './home.component';

const routes: Routes = [
  { path: 'login', component: LoginComponent },
  { path: 'home', component: HomeComponent, canActivate: [AuthGuard] },
  // 其他路由配置...
];

export const AppRoutingModule = RouterModule.forRoot(routes);