如何通过间隔从服务器获取数据？

Question

I use angular6, i try get json from server through 5 seconds interval.

JSFIDDLE

Its my service:

getExample(): Observable<any> {
    console.log('getExample');
    return Observable
      .timer(0, 5000)
      .flatMap(() => this.httpClient.get('https://jsonplaceholder.typicode.com/posts'))
      .map((r) => {
        return r;
      });
  }

Please help fix this code.

PS: more simple service worked without problem

Answer 1

RxJS 6 has updated to use pipeable operators . Also, timer imports from a different path . You should import timer (or interval in this case) directly and use .pipe with the operators that you need. Finally, use mergeMap instead of flatMap .

import { interval } from 'rxjs';
import { mergeMap, map } from 'rxjs/operators';

return interval(5000).pipe(
  mergeMap(() => this.httpClient.get('https://jsonplaceholder.typicode.com/posts')),
  map((r) => {
    console.log(r);
    return r;
  })
);