如何以角度检索和更新我的firebase数据

var myapp = angular.module('point',['firebase']);

myapp.factory('fact', function ($firebaseArray)
{
    var ref = new Firebase("https://myangularl.firebaseio.com");
    return $firebaseArray(ref);
})



myapp.controller('financeCtrl', function ($scope,fact)
{
    $scope.students = fact;

    $scope.add = function (data)
    {



            var name = $scope.name;
            var major = $scope.major;

            $scope.students.$add({
                name: name, major: major
            });

        $scope.name="";
        $scope.major="";

    },

    $scope.remove = function(data)
    {
        $scope.students.$remove(data);
    }
});
var myapp = angular.module('point',['firebase']