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Angular-“没有导出成员'可观察'”
打字稿代码： import { Injectable } from '@angular/core'; import { Observable } from 'rxjs/Observable'; import { of } from 'rxjs/observable/of'; import { Hero } from './hero'; import { HEROES } from './mock-heroes'; @Injectable({ providedIn: 'root' }) export class HeroService { constructor() { } getHeroes(): Observable<Hero[]> { return of(HEROES); } } 错误信息： …