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得到错误../node_modules/rxjs/Rx“' has no exported member ' of”

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我正在从教程中学习新的角度（https://angular.io/tutorial/toh-pt4#inject-message-service） . 在添加服务后运行应用程序时我陷入了困境

../node_modules/rxjs/Rx"' has no exported member 'of'.

hero.service.ts
---------------------


import { Injectable } from '@angular/core';

// import { Observable, of } from 'rxjs';
import { Observable, of } from 'rxjs/Observable';

import { Hero } from './hero';
import { HEROES } from './mock-heroes';
import { MessageService } from './message.service';

@Injectable()

export class HeroService {

  constructor(private messageService: MessageService) { }

  getHeroes(): Observable<Hero[]> {
    // TODO: send the message _after_ fetching the heroes
    this.messageService.add('HeroService: fetched heroes');
    return of(HEROES);
  }
}

我的Angular版本和相关信息是

Angular CLI: 1.7.4
Node: 6.14.1
OS: linux x64
Angular: 5.2.10
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

@angular/cli: 1.7.4
@angular-devkit/build-optimizer: 0.3.2
@angular-devkit/core: 0.3.2
@angular-devkit/schematics: 0.3.2
@ngtools/json-schema: 1.2.0
@ngtools/webpack: 1.10.2
@schematics/angular: 0.3.2
@schematics/package-update: 0.3.2
typescript: 2.5.3
webpack: 3.11.0

    @angular/cli: 1.7.4
    @angular-devkit/build-optimizer: 0.3.2
    @angular-devkit/core: 0.3.2
    @angular-devkit/schematics: 0.3.2
    @ngtools/json-schema: 1.2.0
    @ngtools/webpack: 1.10.2
    @schematics/angular: 0.3.2
    @schematics/package-update: 0.3.2
    typescript: 2.5.
angular rxjs angular5

1 回答

  • 45

    从您的代码看起来您正在遵循基于Angular 6和Rxjs 6的Angular官方指南.Rxjs有一个重大变化，您现在必须以不同的方式导入 operators 和 Observable .

    在Rxjs 6中，导入如下 -

    import { Observable, of } from 'rxjs'; // only need to import from rxjs

    但是当您使用Angular 5.2.x时，您可能仍在使用Rxjs 5x版本 . 因此，您的import语句应如下所示

    import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
// or 
import { of } from 'rxjs/observable/of';

    请查看以下链接以获取完整的更改日志和安装兼容包 rxjs-compat 的说明，以便从角度5升级到6 .

    请参阅此链接以供参考：https://www.academind.com/learn/javascript/rxjs-6-what-changed/

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