如何设置activatedRouter只运行一次？

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

export class ActivateGuard implements CanActivate {
  private hasRun: boolean = false;

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    if (!this.hasRun) {
      this.hasRun = true;
      return true;
    }
    return false;
  }
}

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

const routes: Routes = [
  {
    path: 'example',
    canActivate: [ActivateGuard],
    component: ExampleComponent
  },
  // 其他路由配置...
];

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