Question

在我的Angular2应用中，我正在尝试使用模块https://www.npmjs.com/package/angular2-phoenix-channels导入Phoenix频道。我遇到一个问题，即尝试访问导入脚本的某些属性会返回“未定义的”＃39;错误。

首先，这一切都发生在person.service.ts。该模块没有打字稿定义文件，因此导入如下：

import * as angular2PhoenixChannels from 'angular2-phoenix-channels';
var PhoenixChannels = angular2PhoenixChannels;

如果我在以下上下文中运行console.log（日志位于getPerson（）的底部）：

@Injectable()
export class PersonService {
    private apiUrl = 'http://localhost:4000/api/';
    private phoenixChannels = PhoenixChannels;

    constructor(private http: Http) {
        console.log('Service ready...');
    }

      getPeople(): Promise<Person[]> {
        let headers = new Headers({ 'Content-Type': 'application/json' });
        let options = new RequestOptions({ headers: headers });
        return this.http
          .get(this.apiUrl + 'people', options)
          .toPromise()
          .then(response => response.json().data as Person[])
      }

      getPerson(id: number): Promise<Person> {
          console.log(this.phoenixChannels.default.prototype.channel)
          return this.getPeople()
            .then(people => people.find(person => person.id === id));
      }
}

此日志：

function channel(topic) {
  return new PhoenixChannel(this.socket, topic);
}

对我来说很好看。但是，如果我尝试将参数传递给channel()函数，如下所示：

console.log(this.phoenixChannels.default.prototype.channel("testing"))

这会返回错误

Uncaught (in promise): Error: Error in :0:0 caused by: Cannot read property 'channel' of undefined

为什么这个对象突然变得不确定？

Angular2 - 模块函数返回＆＃39; undefined＆＃39;

0 个答案: