问angular js动态添加列到ui-grid

EN

    $scope.gridOptions = {
            enableColumnsResize: true,
            enableSorting: false,
            enableFiltering: false,
            autoResize: true,
            enableFocusedCellEdit: true,
            enableCellSelection: true,
            enableCellEditOnFocus: true,
            enableColumnMenus: false,
            columnDefs: [

            ],
            data:$scope.swap,
            onRegisterApi: function (gridApi) {
                $scope.grid1Api = gridApi;
            }

        };
$http.get('/Default1/GetJsonData')
            .success(function (result) {
                $scope.swap = result;
                $scope.gridOptions.push({name:'newcol',filter:'newcolarray'})

                $scope.gridOptions.data = $scope.swap;
                console.log(result);
            })
            .error(function (data) {
                console.log(data);
            });