“Observable<Response>"类型上不存在属性“toPromise" [英] Property 'toPromise' does not exist on type 'Observable<Response>'

问题描述

import { Headers, Http } from '@angular/http';

@Injectable()
export class PublisherService{

    private publishersUrl = 'app/publisher';

    constructor(private http: Http) { }

    getPublishers(): Promise<Publisher[]>{
        return this.http.get(this.publishersUrl)
                   .toPromise()
                   .then(response => response.json().data) 
                   .catch(this.handleError);
    }
}    

我收到此错误:

属性 'toPromise' 不存在于类型 'Observable'.any

Property 'toPromise' does not exist on type 'Observable'.any

推荐答案

你需要像这样添加操作符:

You need to add the operator like this:

import 'rxjs/add/operator/toPromise';

这对于您要使用的每个 rxjs 运算符都是必需的.

This is needed for every rxjs operator you want to use.

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