如何删除angularjs中对象的空值

如何从angularjs-中的对象中删除空值

这是我的JavaScript代码

$scope.addRole = function() { 
                            var tempDept = "";
                            angular
                                    .forEach(
                                            $scope.departments,
                                            function(value, key) {
                                                if (value.name == currentDepartment) { console.log(value.name);
                                                    tempDept = currentDepartment;
                                                    if (value.roles != "") value.roles
                                                    //value.roles
                                                            .push({
                                                                name : $scope.role.name,
                                                                //responsibilities : $scope.role.responsibilities
                                                            });
                                                }
                                            });
                            $scope.save(tempDept);
                            $scope.role = {
                                name : "",
                                responsibilities : []
                            };
                                $scope.role.responsibilities.push({name : ""});
                                $scope.role.responsibilities.push({name : ""});
                                $scope.role.responsibilities.push({name : ""});
                                currentDepartment = "";
                                console.log($scope.role.responsibilities.name);
                                $scope.role.responsibilities.splice(index, 1);

                            //$scope.save();
                        }

我想删除对象的空值，该怎么做？给我一些建议。。