$state和$rootScope.$on($stateChangeStart)

这两者的区别：请看博客：http://stackoverflow.com/questions/32680292/angularjs-state-and-rootscope-onstatechangestart-issue

使用方法：

在config方法里注册：
$urlRouterProvider.otherwise( function($injector, $location) {
    var $state = $injector.get("$state");
    $state.go("cover");
});

$stateProvider
    .state('auth', {
        url: '/auth',
        templateUrl: '../views/authView.html',
        controller: 'AuthController as auth'
    })
    .state('users', {
        url: '/users',
        templateUrl: '../views/userView.html',
        controller: 'UserController as user'
    })
....

app.run(function($rootScope, $state, $location) {
    $rootScope.$on('$stateChangeStart', function(event, toState, fromState) {

        //ERROR IS IN THIS BLOCK
        if($rootScope.authenticated && $rootScope.onboard == ) {

            //event.preventDefault();

            $state.transitionTo("onboard", null, {notify:false});
            $state.go('onboard');
        }
...