如何在Angular 2中通过guard向没有权限的用户显示消息

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

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

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    // 在这里进行权限检查的逻辑判断
    const hasPermission = // 检查用户是否有权限的逻辑判断

    if (!hasPermission) {
      // 如果没有权限，跳转到没有权限的页面，并显示消息
      this.router.navigate(['/no-permission']);
      return false;
    }

    return true;
  }
}

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { HomeComponent } from './home.component';
import { NoPermissionComponent } from './no-permission.component';
import { AuthGuard } from './auth.guard';

const routes: Routes = [
  { path: '', component: HomeComponent, canActivate: [AuthGuard] },
  { path: 'no-permission', component: NoPermissionComponent },
];

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

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

@Component({
  selector: 'app-no-permission',
  template: '<h1>您没有权限访问该页面</h1>'
})
export class NoPermissionComponent { }