使用Observable初始化Angular 2中的接口

Question

我有一个名为Users的界面,我正在尝试初始化对象,如下所示:

constructor(private _http: Http) {  }

  getUsers(): Observable<User[]> {
        return this._http.get(this._url)
            .map((response: Response) => response.json())

            .do(data => console.log("User data" + JSON.stringify(data)))
            .catch(this.handleError);
    }

    private handleError(error: Response) {
        console.log(error);
        return Observable.throw(error.json().error || 'Internal Server error');
    } 

但是我收到以下错误.

The type argument for type parameter 'T' cannot be inferred from the 
usage. Consider specifying the type arguments explicitly. Type 
argument candidate 'Response' is not a valid type argument because it 
is not a supertype of candidate 'Response'. Types of property 'type' 
are incompatible. Type 'string' is not assignable to type  'ResponseType'

URL是JSON文件的文件路径.我试图以这种方式设置它,以便我可以更轻松地转换到真正的HTTP调用,但现在我想使用来自JSON文件的模拟数据.

Answer 1

Response从中导入对象angular2/http

import { Response } from '@angular/http';

您可以阅读或了解更多信息:https: //angular.io/docs/ts/latest/guide/server-communication.html#!#extract-data