angular - ionic 3 : Uncaught (in promise): ReferenceError: google is not defined ReferenceError

Question

你好吗？我正在研究带有 Ionic 3 教程的 Google map 。我已经完成了那里解释的一切，但是当项目启动时，出现了这个错误。我调查了很多，但没有任何效果。谢谢!

Error: Uncaught (in promise): ReferenceError: google is not defined
ReferenceError: google is not defined

这是我的代码:

home.ts

import { Component, ViewChild, ElementRef } from '@angular/core';
import { NavController } from 'ionic-angular';
import { IonicPage } from 'ionic-angular';

declare var google;

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

    @ViewChild('map') mapElement:ElementRef;
    map: any;
    start = 'chicago, il';
    end = 'chicago, il';
    directionsService = new google.maps.DirectionsService;
    directionsDisplay = new google.maps.DirectionsRenderer;

    constructor(public navCtrl: NavController) {

    }

    ionViewLoad(){
        this.initMap();
    }

    initMap(){
        this.map = new google.maps.Map(this.mapElement.nativeElement, 
    { 
            zoom: 7,
            center: {lat: 41.85, lng: -87.65}
    });

        this.directionsDisplay.setMap(this.map);
    }

    calculateAndDisplayRoute(){
        this.directionsService.route({
            origin: this.start,
            destination: this.end,
            travelMode: 'DRIVING',
        }, (response, status) => {
            if(status == 'OK'){
                this.directionsDisplay.setDirections(response);
            }else{
                window.alert('Directions request failed due to ' + 
        status);
            }
        });
        }

     }

Answer 1

确保在加载 javascript 时使用 HTTPS!

由此改变

<script src="http://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY"></script>

到

<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY"></script>