javascript - Observables "retryWhen"延迟

Question

如何在 retryWhen 中设置延迟？

import 'rxjs/add/operator/retry';
import 'rxjs/add/operator/retrywhen';

...

constructor(http: Http) {

  var headers = new Headers();
  headers.append('Content-Type', 'text/plain');
  http.post('https://mywebsite.azurewebsites.net/account/getip', "", { headers: headers })
     .retryWhen(errors => {
                return errors.delay(1000);   // errors is not a function
              })
             (event) => {
                // handle events
                this.ip = event.json();
            },
            (error) => {
                console.error(error);
                toastr.error('No connection to server. Please reload the page!')

            }
            );
 }

我收到错误:errors is not a function。

Answer 1

import {Http, Headers, Response} from '@angular/http';

http.get('http://jsonplaceholder.typicode.com/posts/1/commentsss')
    .retryWhen(e => e.scan<number>((errorCount, err) => {
        if (errorCount >= 10) {
            throw err;
        }
        return errorCount + 1;
    }, 0).delay(1000))
    .subscribe(r => console.log(`Sub: ${r}`))

重试 10 次，延迟 1 秒。

plnkr