不能调用未定义的 GetJson 的方法“toLowerCase”

我的谷歌地图v3获取Jsonresult时需要修复代码的情况，但是当我在循环中从jquery加载我的地图时，此错误显示我不知道如何解决这个问题Uncaught TypeError: Cannot call method 'toLowerCase' of undefined我没有看到一些有这个问题的装置。我希望有人可以帮助我解决这个问题

这是我的Javascript代码：

<script type="text/javascript">
    var geocoder;
    var map;
    function initialize() {
        var minZoomLevel = 4;
        var zooms = 7;
        geocoder = new google.maps.Geocoder();
        map = new google.maps.Map(document.getElementById('map'), {
            zoom: minZoomLevel,
            center: new google.maps.LatLng(38.50, -90.50),
            mapTypeId: google.maps.MapTypeId.ROADMAP
        });
        // Bounds for North America
        var strictBounds = new google.maps.LatLngBounds(
     new google.maps.LatLng(15.70, -160.50),
     new google.maps.LatLng(68.85, -55.90)
   );
        // Listen for the dragend event
        google.maps.event.addListener(map, 'dragend', function () {
            if (strictBounds.contains(map.getCenter())) return;
            // We're out of bounds - Move the map back within the bounds
            var c = map.getCenter(),
         x = c.lng(),
         y = c.lat(),
         maxX = strictBounds.getNorthEast().lng(),
         maxY = strictBounds.getNorthEast().lat(),
         minX = strictBounds.getSouthWest().lng(),
         minY = strictBounds.getSouthWest().lat();
            if (x < minX) x = minX;
            if (x > maxX) x = maxX;
            if (y < minY) y = minY;
            if (y > maxY) y = maxY;
            map.setCenter(new google.maps.LatLng(y, x));
        });

        // Limit the zoom level
        google.maps.event.addListener(map, 'zoom_changed', function () {
            if (map.getZoom() < minZoomLevel) map.setZoom(minZoomLevel);
        });

    }
    var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';
    function codeAddress() {
        $.getJSON("/Dashboard/LoadWorkerList", function (address) {
            var infowindow = new google.maps.InfoWindow();
            $.each(address,function (index,currVal) {
               currVal = $(this).val();
                geocoder.geocode({ 'address': currVal }, function (results, status) {
                    if (status == google.maps.GeocoderStatus.OK) {
                        map.setCenter(results[0].geometry.location);
                        var marker = new google.maps.Marker({
                            map: map,
                            icon: iconBase + 'man.png',
                            position: results[0].geometry.location,
                            title: currVal
                        })

                        google.maps.event.addListener(marker, 'click', (function (marker, i) {
                            return function () {
                                infowindow.setContent(currVal);
                                infowindow.open(map, marker);
                            }
                        })(marker, currVal));
                        address.push(marker);
                    }
                    else {
                        alert("Geocode was not successful for the following reason: " + status);
                    }
                });
            });
        });
        return true;
    }
    window.onload = function () {
        initialize();
        codeAddress();
    }
</script>

这是 LoadWorkerList 的代码

   public JsonResult LoadWorkerList()
        {
            var workerList = new List<Worker_Address>();
            // check if search string has value
            // retrieve list of workers filtered by search criteria
            var list = (from a in db.Worker_Address
                        where a.LogicalDelete == false
                        select a).ToList();

            List<WorkerAddressInfo> wlist = new List<WorkerAddressInfo>();
            foreach (var row in list)
            {
                WorkerAddressInfo ci = new WorkerAddressInfo
                {
                    ID = row.ID,
                    Worker_ID = row.WorkerID,
                    AddressLine1 = row.Address_Line1 + " " + row.Address_Line2+ " " +row.City + " "+ GetLookupDisplayValById(row.State_LookID),
                    LogicalDelete = row.LogicalDelete
                };
                wlist.Add(ci);
            }

            return Json(wlist.ToList().OrderBy(p => p.AddressLine1), JsonRequestBehavior.AllowGet);
        }

错误在此 ff： 代码中

Uncaught TypeError: Cannot call method 'toLowerCase' of undefined 
v.fn.extend.val                          jquery-1.8.3.min.js:2
(anonymous function)              $.each(address,function (index,currVal) {
v.extend.each                           jquery-1.8.3.min.js:2
(anonymous function)              currVal = $(this).val();
l                                 jquery-1.8.3.min.js:2
c.fireWith                        jquery-1.8.3.min.js:2
T                                 jquery-1.8.3.min.js:2
r