如何在angular4中保护路由

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 {
    // 在这里编写验证逻辑，判断用户是否有权限访问该路由
    const isAuthenticated = ...; // 根据实际情况判断用户是否已认证

    if (isAuthenticated) {
      return true; // 允许访问该路由
    } else {
      this.router.navigate(['/login']); // 重定向到登录页面
      return false; // 不允许访问该路由
    }
  }
}

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { AuthGuard } from './auth.guard';

const routes: Routes = [
  { path: 'protected', component: ProtectedComponent, canActivate: [AuthGuard] },
  // 其他路由配置...
];

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