function toRad(d) { return d * Math.PI / 180; }
function getDisance(lat1, lng1, lat2, lng2) { #lat为纬度, lng为经度, 一定不要弄错
var dis = 0;
var radLat1 = toRad(lat1);
var radLat2 = toRad(lat2);
var deltaLat = radLat1 - radLat2;
var deltaLng = toRad(lng1) - toRad(lng2);
var dis = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(deltaLat / 2), 2) + Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(deltaLng / 2), 2)));
return dis * 6378137;
}
alert( getDisance(39.91917,116.3896,39.91726,116.3940) );
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