สอบถามเรื่อง geolocation ของ google map ครับ ไม่สามารถใช้ได้ครับ

<script>
    // Note: This example requires that you consent to location sharing when
    // prompted by your browser. If you see the error "The Geolocation service
    // failed.", it means you probably did not give permission for the browser to
    // locate you.

    function initMap() {
        var map = new google.maps.Map(document.getElementById('map'), {
            center: {lat: -34.397, lng: 150.644},
            zoom: 6
        });
        var infoWindow = new google.maps.InfoWindow({map: map});

        // Try HTML5 geolocation.
        if (navigator.geolocation) {
            navigator.geolocation.getCurrentPosition(function (position) {
                var pos = {
                    lat: position.coords.latitude,
                    lng: position.coords.longitude
                };

                infoWindow.setPosition(pos);
                infoWindow.setContent('Location found.');
                map.setCenter(pos);
            }, function () {
                handleLocationError(true, infoWindow, map.getCenter());
            });
        } else {
            // Browser doesn't support Geolocation
            handleLocationError(false, infoWindow, map.getCenter());
        }
    }

    function handleLocationError(browserHasGeolocation, infoWindow, pos) {
        infoWindow.setPosition(pos);
        infoWindow.setContent(browserHasGeolocation ?
            'Error: The Geolocation service failed.' :
            'Error: Your browser doesn\'t support geolocation.');
    }
</script>

    function handleLocationError(browserHasGeolocation, infoWindow, pos) {
        infoWindow.setPosition(pos);
        infoWindow.setContent(browserHasGeolocation ?
            'Error: The Geolocation service failed.' :
            'Error: Your browser doesn\'t support geolocation.');
    }