Geolocalização com javascript

geoloc.js

navigator.geolocation.getCurrentPosition(function(position){
   var latitude = position.coords.latitude;
   var longitude = position.coords.longitude;
   var request = new XMLHttpRequest();
   request.responseType = 'json';
   request.onreadystatechange = function(){
       console.log(request.response.results[0].formatted_address);
   }
   request.open("GET","https://maps.googleapis.com/maps/api/geocode/json?latlng="+latitude+", "+longitude+"&sensor=true",true);
   request.send(null);
});