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openlayer3计算两点之间的距离

openlayer3计算两点之间的距离
对应的openlayers的版本为3.7. 
主要用的接口是ol.Sphere.haversineDistance([x1,y1],[x2,y2]); 
4326坐标系中计算两点距离的方式为: 
var wgs84Sphere = new ol.Sphere(6378137); 
wgs84Sphere.haversineDistance(C1,C2); 
示例为: 
var wgs84Sphere = new ol.Sphere(6378137); 
wgs84Sphere.haversineDistance([120.21592590991689, 30.210793016606],[120.21670777384473, 30.211168525868086]);

openlayer3计算两点之间的距离