在Promise中返回Observable

Question

你能告诉我如何回到Observable这里吗？我尝试了很多方法。但是还没有成功。

[ts]声明类型既不是'void'也不是'any'的函数必须返回一个值。

  deleteInvite(inviteId):Observable<HttpResponse<Object>> {
    this.getHttpHeader().then(headers => {
      return this.http.post(this.apiURL + "/deleteInvite", inviteId, { observe: "response", headers: headers })
    }).catch(err => {
      console.error(err);
    });
  }

  async getHttpHeader() {
    const accessToken = await this.getJWTToken();
    let headers = new HttpHeaders().set('Authorization', `Bearer ${accessToken}`);
    return headers;
  }

Answer 1

FOR rxjs版本：6.0.0以上

import { from } from 'rxjs';

 deleteInvite(inviteId):Observable<HttpResponse<Object>> {
    return from(this.getHttpHeader()).pipe(
        switchMap(headers => {
            return this.http.post(this.apiURL + "/deleteInvite", inviteId, { observe: "response", headers: headers })
        }),
        catchError(err => {
            console.error(err);
        })
    );
}

对于旧版本的rxjs：

thisGetHeaders()通过使用将转换为ObservablefromPromise

import { fromPromise } from 'rxjs/observable/fromPromise';


deleteInvite(inviteId):Observable<HttpResponse<Object>> {
    return fromPromise(this.getHttpHeader()).pipe(
        switchMap(headers => {
            return this.http.post(this.apiURL + "/deleteInvite", inviteId, { observe: "response", headers: headers })
        }),
        catchError(err => {
            console.error(err);
        })
    );
}