angularjs – 控制器中不更新服务变量

我有一个NavbarCtrl不在ng视图之外。我有一个登录控制器，与一个服务进行交谈，以便用户登录。一旦用户登录，我希望Navbar更新用户的电子邮件地址。但是对于我来说，一旦用户登录，我似乎无法让Navbar范围更新为加载到我的“Auth”服务的数据。

这是我的主要index.html：

<div class="navbar navbar-inverse navbar-fixed-top">

        <div class="navbar-inner">
            <div class="container">
                <a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </a>
                <a class="brand" href="#">Brim</a>

                <div class="pull-right"  ng-controller="NavbarCtrl">
                    <div ng-click="refresh()">hello</div>
                    {{ user.email }}
                </div>
            </div>
        </div>

    </div>

    <div class="container" ng-view>

和我的服务：

.factory('Auth',function($resource) {
    var authenticated = false;
    var user = {};
    return {
        isAuthenticated: function () {
            return authenticated;
        },getUser: function() {
            return user;
        },login: function(loginUser,callback) {
            user =  {email:'email@email.com'}
            authenticated = true;
            callback(true);
            //actual code for logging in taken out for brevity
        }
    }
})

和我的登录和导航栏控制器：

function LoginCtrl($scope,$location,Auth) {

$scope.login = function() {
    Auth.login($scope.user,function(success) {
        if(success) $location.path('/dashboard');
        //console.log(Auth.getUser())
    });
}

}

function NavbarCtrl($scope,Auth)  {

//thought this should work
$scope.user = Auth.getUser();

//experimenting unsuccessfully with $watch
$scope.$watch(Auth.isAuthenticated(),function () {
    $scope.user = Auth.getUser()
})

//clicking on a refresh button is the only way I can get this to work
$scope.refresh = function() {
    $scope.user = Auth.getUser()
}
}

从我的研究我会以为$ scope.user = Auth.getUser();会工作，但不是，我完全失去了如何在用户登录时如何更新我的Navbar。提前感谢任何帮助。

$scope.$watch(Auth.isAuthenticated,function() { ... });

$scope.user = Auth.getUser();
// Because user is a reference to an object,if you change the object
// in the service (i.e.,you do not reassign it),$scope.user will
// likewise change.
$scope.$watch('user',function(newValue) { ... },true);
// Above,the 3rd parameter to $watch is set to 'true' to compare
// equality rather than reference.  If you are using Angular 1.2+
// use $watchCollection() instead:
$scope.$watchCollection('user',function(newValue) { ... });

$scope.$watch( function() { return Auth.isAuthenticated() },function() { ... });