我工作在离子离子谷歌地图应用程序和使用谷歌提供的本机和方向服务我甲型肝炎多个途径,使用以下代码:

calculateAndDisplayRoute() {
var points = [];
this.directionsService.route({
origin: this.start,
destination: this.end,
travelMode: 'DRIVING',
provideRouteAlternatives: true

}, (response, status) => {
if (status === 'OK') {
var step = 1;

for(var j=0;j<response.routes.length;j++){

  points=[]
  for (var i = 0; i < response.routes[j].overview_path.length; i++) {
    points.push(response.routes[j].overview_path[i].toJSON())
  }
  let position=points[20]
  this.drawRoutePolyLine(points,j,position)
  step=step+1
}

} else {
window.alert('Directions request failed due to ' + status);
}
});
} 帮我添加infowindow