角度:RxJs switchMap生成错误

您的方法类型为void,因为您没有返回任何值。 那么你必须这样改变它。

private getProduct(id:string) {
this.dataService.getProduct(id).subscribe(product => {
  this.product = product;
  this.currentImage = product.image[0];
  console.log('product = ', this.product);
});
return of(this.product);
}

如果您像这样重构代码,它的可读性会更高。

 product$: Observable<any>;
 ngOnInit() {
  this.product$ = this.route.paramMap
  .switchMap((params: ParamMap) =>
  this.getProduct(params.get('id')));
  this.product$.subscribe(product => {
  this.currentImage = product.image[0];
});
}
private getProduct(id:string) {
return this.dataService.getProduct(id);
}

ngOnInit() {
this.route.paramMap.pipe(
  switchMap((params: ParamMap) => {
    return this.palmaresService.getPalmaresForAnUser(params.get('id'));
  })
).subscribe(
  result => {
    this.userDetails = result as any;
  },
  error => {
    console.log('Error on fetching data: ', error);
  }
);}