如何在google map javascript上为不同用户创建不同路由

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

<div id="map"></div>

var map = new google.maps.Map(document.getElementById('map'), {
  center: {lat: YOUR_LATITUDE, lng: YOUR_LONGITUDE},
  zoom: ZOOM_LEVEL
});

var directionsService = new google.maps.DirectionsService();
var directionsRenderer = new google.maps.DirectionsRenderer();

var request = {
  origin: ORIGIN_COORDINATES,
  destination: DESTINATION_COORDINATES,
  travelMode: google.maps.TravelMode.DRIVING
};

directionsService.route(request, function(result, status) {
  if (status == google.maps.DirectionsStatus.OK) {
    directionsRenderer.setDirections(result);
  }
});

directionsRenderer.setMap(map);