Angular 2 auth guard -我的应用程序在加载任何路由之前需要首先进行身份验证。我该怎么处理呢？

import { Injectable } from '@angular/core';
import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree, Router } from '@angular/router';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class AuthGuard implements CanActivate {

  constructor(private router: Router) { }

  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {

    // 在这里进行身份验证的逻辑判断
    const isAuthenticated = // 判断用户是否已经身份验证，例如检查本地存储中的token

    if (isAuthenticated) {
      return true; // 身份验证通过，允许访问路由
    } else {
      // 身份验证未通过，重定向到登录页面
      this.router.navigate(['/login']);
      return false;
    }
  }
}

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { HomeComponent } from './home.component';
import { ProfileComponent } from './profile.component';
import { AuthGuard } from './auth.guard';

const routes: Routes = [
  { path: '', component: HomeComponent },
  { path: 'profile', component: ProfileComponent, canActivate: [AuthGuard] }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

import { Component } from '@angular/core';
import { AuthService } from './auth.service';

@Component({
  selector: 'app-profile',
  template: `
    <h1>Profile Page</h1>
    <!-- 在这里显示用户的个人资料 -->
  `
})
export class ProfileComponent {

  constructor(private authService: AuthService) { }

  // 在组件的生命周期钩子中进行身份验证
  ngOnInit() {
    this.authService.authenticate(); // 调用身份验证服务的方法
  }
}