typescript - Angular 可观察对象：在这个解决方案中，如何向 callWS() 方法传递参数？

使用和重置 shareReplay 的这个解决方案来自：RxJS shareReplay：如何重置其值？

private _refreshProfile$ = new BehaviorSubject<void>(undefined);

public profile$: Observable<Customer> = _refreshProfile$
  .pipe(
    switchMapTo(this.callWS()),
    shareReplay(1),
   );

public refreshProfile() {
  this._refreshProfile$.next();
}

答案＃1

你可以使用 switchMap。用法如下：

private _refreshProfile$ = new BehaviorSubject<number>(0);

public profile$: Observable<Customer> = _refreshProfile$
  .pipe(
    switchMap(userId => this.callWS(userId)),
    shareReplay(1),
   );

public refreshProfile(userId: number) {
    this._refreshProfile$.next(userId);
}

this.profile$.subscribe(console.log);
this.refreshProfile(20); // 20 will be passed as userId to callWS

StackBlitz 参考：https://stackblitz.com/edit/angular-ivy-ezaxsk?file=src/app/hello.component.ts