JS - Navigator geolocalisation longitude and latitude

geolocalisation.js

 if ("geolocation" in navigator) {
                navigator.geolocation.getCurrentPosition(function(position) {
                 // Yes navigator got geolocation and you got permitions to use it
                    alert(position.coords.latitude, position.coords.longitude);
                });
            } else {
                 alert('sorry your browser not support geolocalisation');
            }