Ionic 2 Yelp API

Question

我正尝试将Ionic 2应用程序连接到Yelp的API。现在我只是使用从CLI生成并运行在本地主机上的空白Ionic 2应用程序。

我的代码：

app.module.ts

import { BrowserModule } from '@angular/platform-browser'; 
import { ErrorHandler, NgModule } from '@angular/core'; 
import { HttpModule } from '@angular/http'; 
import { IonicApp, IonicErrorHandler, IonicModule } from 'ionic-angular'; 
import { SplashScreen } from '@ionic-native/splash-screen'; 
import { StatusBar } from '@ionic-native/status-bar'; 

import { MyApp } from './app.component'; 
import { HomePage } from '../pages/home/home'; 

@NgModule({ 
    declarations: [ 
    MyApp, 
    HomePage 
    ], 
    imports: [ 
    BrowserModule, 
    HttpModule, 
    IonicModule.forRoot(MyApp) 
    ], 
    bootstrap: [IonicApp], 
    entryComponents: [ 
    MyApp, 
    HomePage 
    ], 
    providers: [ 
    StatusBar, 
    SplashScreen, 
    {provide: ErrorHandler, useClass: IonicErrorHandler} 
    ] 
}) 
export class AppModule {} 

home.ts

import { Component } from '@angular/core'; 
import { NavController } from 'ionic-angular'; 
import { Http } from '@angular/http'; 
import { Headers, RequestOptions } from '@angular/http'; 
import 'rxjs/add/operator/map'; 

@Component({ 
    selector: 'page-home', 
    templateUrl: 'home.html' 
}) 
export class HomePage { 

    restaurants:any; 
    constructor(public navCtrl: NavController, public http: Http) { 
    var headers = new Headers(); 
    headers.append('Authorization', 'Bearer someString'); 
    var options = new RequestOptions({headers: headers}); 

    this.http.get('https://api.yelp.com/v3/businesses/search?term=deli20&latitude=39.59754&longitude=-104.872934', options).map(res => res.json()).subscribe(data => { 
     this.restaurants = data.data.children; 
     console.log(this.restaurants); 
    }); 
    } 



} 

home.html

<ion-header> 
    <ion-navbar> 
    <ion-title> 
     Ionic Blank 
    </ion-title> 
    </ion-navbar> 
</ion-header> 

<ion-content padding> 
    The world is your oyster. 
    <p> 
    If you get lost, the <a href="http://ionicframework.com/docs/v2">docs</a> will be your guide. 
    </p> 
    <!--Just using Ionic 2's default home page, just wanna output my JSON to the console for now.--> 
</ion-content> 

页面呈现correc TLY，但我在控制台中出现错误：“无法加载资源：预检响应不成功”

的回应是这样的：

{"error": {"code": "TOKEN_MISSING", "description": "An access token must be supplied in order to use this endpoint."}} 

什么我可能会丢失有什么想法？

Answer 1

将此chrome plugin加入您的浏览器，将其打开并重新加载页面。它应该工作正常