类型"Observable< Response>"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:

类型可观察"的属性"toPromise"不存在.任何

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

推荐答案

您需要像这样添加运算符:

You need to add the operator like this:

import 'rxjs/add/operator/toPromise';

您要使用的每个rxjs运算符都需要此功能.

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

这篇关于类型"Observable< Response>"上不存在属性"toPromise"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！