src/app/hero.service.ts（2,22）中的错误：错误TS2305:Module'&引用；F:/angular tour of heroes/node_modules/rxjs/Rx"'；没有导出的成员'；属于'；

下面是我的angular

package.json

设置

"dependencies": {
  "@angular/animations": "^5.2.11",
  "@angular/common": "^5.2.11",
  "@angular/compiler": "^5.2.11",
  "@angular/core": "^5.2.11",
  "@angular/forms": "^5.2.11",
  "@angular/http": "^5.2.11",
  "@angular/platform-browser": "^5.2.11",
  "@angular/platform-browser-dynamic": "^5.2.11",
  "@angular/router": "^5.2.11",
  "core-js": "^2.4.1",
  "rxjs": "^5.5.10",
  "zone.js": "^0.8.19"
},

"devDependencies": {
    "@angular/cli": "~1.7.4",
    "@angular/compiler-cli": "^5.2.11",
    "@angular/language-service": "^5.2.11"
}

下面是HeroService组件的代码，并获取下面发布的错误

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import 'rxjs/add/Observable/of';
import { Hero } from './hero';
import { HEROES } from './mock-heroes';

@Injectable()
export class HeroService {
  constructor() { }
  getHeroes() : Observable<Hero[]> {
      return of(HEROES);
  }

}

以下是我尝试过的一些事情，但没有取得积极的结果：

import { Observable, of } from 'rxjs';

及

---

对此有何建议？

从正确的位置导入：

import 'rxjs/add/observable/of';

---

我认为导入路径不正确

尝试按如下方式导入：

import 'rxjs/add/observable/of';

或

---

但它仍然抛出“src/app/hero.service.ts（14,11）中的错误：错误TS2304:找不到名称'of'。”上面的答案是从'rxjs/observate/of'导入{of}；这一条有效：“从'rxjs/observable/of'导入{of}；”“太好了！！快乐编码：）

import 'rxjs/add/observable/of';

import 'rxjs/add/observable/of';

import { of } from 'rxjs/observable/of';