Logout approach for angularjs? - angularjs

Question

I have started learning angularjs for two days, there a lot of new concepts that are new to me, i'm building a test project to my final project testing all the new different things so far,
I'm stuck in the logout, i have implement the ng-if directive in the login controller and it works great i have test it the success method of login request, but i want to move my logout html to the navbar which is in the index.html, so i'm not sure where to put my logic to test against the cookie ?
that's my index.html
<div ng-controller="HomeController">
<nav class="navbar navbar-default" role="navigation">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/">Brand</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active">Register</li>
<li>Login</li>
<li>Articles</li>
<li ng-if ="isAuth" ng-click="LogOut()">LogOut</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
</div>
<div data-ng-view=""></div>
HomeController
app.controller('HomeController', function ($scope, Auth) {
$scope.isAuth = Auth.IsAuth;
});
Auth service
app.service('Auth', function ($cookieStore) {
var auth = function myfunction() {
if ($cookieStore.get('token')) {
return true;
}else{
return false;
}
}
return{
isAuth : auth()
}
});