Angular5 + takeWhile不是一个函数

Question

我有这段代码：

public ngOnInit(){
  this.schemeStore.getSchemesByAffId()
  .takeWhile(() => this.isAlive)
  .subscribe((schemes: Scheme[]) => {
    const currId = schemes[0].currency;
    this.schemeFunds$ = this.fundStore
      .getSchemeValorizationsByCurrency(currId);
  });
}

我甚至用以下内容导入了takeWhile：

import { takeWhile } from 'rxjs/operators';

但我有这条错误消息：

ERROR TypeError: this.schemeStore.getSchemesByAffId(...).takeWhile is not a function

有人有想法吗？

Answer 1

错误导入我想，试试：

import 'rxjs/add/operator/takeWhile';