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

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// #docregion
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/delay';
@Injectable()
export class AuthService {
isLoggedIn: boolean = false;
// store the URL so we can redirect after logging in
redirectUrl: string;
login(): Observable<boolean> {
return Observable.of(true).delay(1000).do(val => this.isLoggedIn = true);
}
logout(): void {
this.isLoggedIn = false;
}
}