angular-docs-cn/public/docs/_examples/router/ts/app/auth-guard.service.1.ts

// #docregion
import { Injectable }     from '@angular/core';
import { CanActivate }    from '@angular/router';

@Injectable()
export class AuthGuard implements CanActivate {
  canActivate() {
    console.log('AuthGuard#canActivate called');
    return true;
  }
}