如何在Google Map的Directions服务中创建制作者的信息窗口

我使用Google Map API中的路线服务创建了路线 Map .

而现在我正在尝试定制路线中标记的信息 .

但不可能如何改变它 . 该项目是Ionic 3 .

import { Component, ViewChild, ElementRef } from '@angular/core';
import { NavController, NavParams } from 'ionic-angular';
import { HttpClient } from "@angular/common/http";
import { Observable } from "rxjs/Observable";
import 'rxjs/add/operator/map';

declare var google;

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

    loadMap() {

        let latLng = new google.maps.LatLng(37.357499, -5.979938);

        let mapOptions = {
            center: latLng,
            zoom: 6,
            mapTypeId: google.maps.MapTypeId.ROADMAP
        }
        this.map = new google.maps.Map(this.mapElement.nativeElement, mapOptions);
    }

    startNavigating() {

        let directionsService = new google.maps.DirectionsService;
        let directionsDisplay = new google.maps.DirectionsRenderer;
        let wayPoints = [];

        for (let i = 0; i < this.waypoints.length; i++) {
            wayPoints.push({
                location: {
                    lat: Number(this.waypoints[i].latitud),
                    lng: Number(this.waypoints[i].longitud)
                },
                stopover: true
            });
        }

        directionsDisplay.setMap(this.map);

        directionsService.route({

            //Origin Destination and Waypoints populated with Demo Data
            origin: {
                lat: Number(this.origin.latitud),
                lng: Number(this.origin.longitud)
            },
            destination: {
                lat: Number(this.destination.latitud),
                lng: Number(this.destination.longitud)
            },
            waypoints: wayPoints,
            optimizeWaypoints: false,
            travelMode: google.maps.TravelMode['WALKING']
        }, (res, status) => {

            if (status == google.maps.DirectionsStatus.OK) {
                directionsDisplay.setDirections(res);
            } else {
                console.warn(status);
            }
        });
    }
}

我正在尝试为在DirectionsService（Google Maps API V3）的回调函数中创建的标记设置infoWindows . 我尝试了许多不同的方法，没有任何运气 .