javascript - 使用 Angular 4 和 Http observables 进行无限轮询

Question

我正在尝试在我的 Http 服务中构建一个无限轮询，因为我正在构建一个 dashborad 之王，它调查来自伺服器的数据，这是我几乎可以工作的代码(在我的控制台中，我看到 Json 来了，但是它没有反射(reflect)我的观点......我想注入(inject)我的用户:Observable

const usersURL = 'http://my.super.servor.php'

@Injectable()
export class UserService {

 users: Observable<User[]>

   constructor (public http:Http) {
     this.users = http.get(usersURL)
              genre mobile ou autre
              .map(res => [res.json()]);

        let i = this.users.subscribe(
          usersURL => console.log(usersURL),
         () => {}, // Here we catch up errors
         () => console.log("completed!") // Here we catch up if its completed
        )

    // Here's where I'm trying to do the polling every 5 secondes
    let tick$ = Observable.interval(5000);

    let response$ = 
      tick$
          .flatMap(() => http.get(usersURL))
          .map(res => [res.json()]);

    let stockPoller = response$.subscribe(res => console.log(res));
  }

Answer 1

您只需将轮询可观察对象分配给 this.users:

this.users = tick$.flatMap(() => http.get(usersURL)).map(res => [res.json()]);