如何在POST后刷新angular 6上的observable

import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Component({
  // 组件的其他配置
})
export class YourComponent implements OnInit {
  data: Observable<any>;

  constructor(private http: HttpClient) { }

  ngOnInit() {
    this.refreshData();
  }

  refreshData() {
    this.data = this.http.post<any>('your-api-url', { /* POST请求的数据 */ });
  }
}

<div *ngIf="data | async as result">
  <!-- 显示result的值 -->
</div>