从服务获取数据时，Angular 2 rxjs 订阅不是功能

Question

I'm new to angular and I know this is a basic but I'm having problems passing the _newArray to my child component using a shared service

Service

getJson(): Observable < any > {
  return forkJoin(this.getQuestions(), this.getData()).pipe(
    tap(data => {
      this.MergeData(this._questionsArray, this._dataArray);
    })
  );
}

MergeData(question, data): any[]{
  let _newArray: any[] = [];
  _newArray.push({
    test1: "test1",
    test2: "test2"
  });
  return _newArray
}

Component

export class CheckComponent implements OnInit {

  _finalArr: any[];

  constructor(private apiService: ApiService) { }

  ngOnInit(): void {
    this.apiService.getJson()
      .subscribe(data => {
        this._finalArr = data;
      });

  }
}

Answer 1

getJson is currently returning a Subscription, it must return an Observable. Try:

getJson(): Observable {

    return forkJoin(this.getQuestions(), this.getData()).pipe(
      tap(data => {
          this.MergeData(this._questionsArray, this._dataArray);
      })
    );
  }