如何使用Bing maps API获取路线的距离？

<script type="text/javascript" src="https://www.bing.com/api/maps/mapcontrol?key=YOUR_API_KEY"></script>

<div id="mapContainer" style="width: 100%; height: 400px;"></div>

var map = new Microsoft.Maps.Map(document.getElementById('mapContainer'), {
    credentials: 'YOUR_API_KEY'
});

var directionsManager = new Microsoft.Maps.Directions.DirectionsManager(map);
var start = new Microsoft.Maps.Directions.Waypoint({ address: '起点地址' });
var end = new Microsoft.Maps.Directions.Waypoint({ address: '终点地址' });

directionsManager.addWaypoint(start);
directionsManager.addWaypoint(end);

directionsManager.calculateDirections();
Microsoft.Maps.Events.addHandler(directionsManager, 'directionsUpdated', function () {
    var distance = directionsManager.getRouteResult().distance;
    console.log('路线距离：' + distance + '公里');
});