calculate distance between two points google map

by yeoman

HTML

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyDatb-OuXM3HnUrSN3LBEiV4vWLgD_sTj0&amp;libraries=geometry"></script>

JavaScript

var p1 = new google.maps.LatLng(45.463688, 9.18814);
var p2 = new google.maps.LatLng(46.0438317, 9.75936230000002);

alert(calcDistance(p1, p2));

//calculates distance between two points in km's
function calcDistance(p1, p2) {
  return (google.maps.geometry.spherical.computeDistanceBetween(p1, p2) / 1000).toFixed(2);
}