Openlayers - Turf.js使用EPSG:3857获取两点之间的距离

<script src="path/to/openlayers.js"></script>
<script src="path/to/turf.js"></script>

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

// 初始化地图
var map = new ol.Map({
  target: 'map',
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  view: new ol.View({
    center: ol.proj.fromLonLat([0, 0]),
    zoom: 2
  })
});

// 添加两个点
var point1 = ol.proj.fromLonLat([lon1, lat1]);
var point2 = ol.proj.fromLonLat([lon2, lat2]);

var feature1 = new ol.Feature({
  geometry: new ol.geom.Point(point1)
});

var feature2 = new ol.Feature({
  geometry: new ol.geom.Point(point2)
});

var vectorSource = new ol.source.Vector({
  features: [feature1, feature2]
});

var vectorLayer = new ol.layer.Vector({
  source: vectorSource
});

map.addLayer(vectorLayer);

var distance = turf.distance(point1, point2);
console.log('距离：' + distance + '千米');