创建要在其他函数中使用的全局变量

有人可以向我解释为什么当我尝试在函数外部访问它时，即使它是对象的一部分，为什么'currentPos.LatLng'是未定义的？基本上，我试图能够获取我当前位置的值，以便我可以在另一个函数中再次使用它们。对这个东西很陌生...提前谢谢。

var map;
var infowindow;
var currentPos = {
};
var city = new google.maps.LatLng(60, -105);
function initialize() {
    map = new google.maps.Map(document.getElementById('map_canvas'), {
        mapTypeId: google.maps.MapTypeId.ROADMAP,
        center: city,
        zoom: 13
    });
    if(navigator.geolocation) {
        browserSupportFlag = true;
        navigator.geolocation.getCurrentPosition(
            function(position) {
                pos = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
                map.setCenter(pos);
                currentPos.LatLng = pos;
                console.log(currentPos.LatLng);
            }, 
            function() {
                handleNoGeolocation(true);
            }
        );          
    } else {
        handleNoGeolocation(false);
    }
    function handleNoGeolocation(errorFlag) {
        if (errorFlag) {
            var content = 'Error: The Geolocation service failed.';
        } else {
            var content = 'Error: Your browser doesn''t support geolocation.';
        }
    }
    var request = {
                location: city,
                radius: 2500,
                types: ['store']
            };
    infowindow = new google.maps.InfoWindow();
    var service = new google.maps.places.PlacesService(map);
    service.search(request, callback);
    function callback(results, status) {
        if (status == google.maps.places.PlacesServiceStatus.OK) {
            for (var i = 0; i < results.length; i++) {
                createMarker(results[i]);
            }
        }
    }
    function createMarker(place) {
        var placeLoc = place.geometry.location;
        var marker = new google.maps.Marker({
            map: map,
            position: place.geometry.location
        });
        google.maps.event.addListener(marker, 'click', function() {
            infowindow.setContent(place.name);
            infowindow.open(map, this);
        });
    }
}
google.maps.event.addDomListener(window, 'load', initialize);   
console.log(currentPos.LatLng);