如何从App.vue访问组件属性(How to access a component property from App.vue)

 我使用Angular事件来处理这样的事情 - 例如： 
 
    .controller('parentCtrl', function($scope,$rootScope) {
        $rootScope.$on('loading',function(e,_statusObj.loading) {
            $scope.loading = _statusObj.loading;
            if(!!_statusObj.msg) {
                alert(_statusObj.msg);
            }
        });
    })
    .controller('childCtrl', function($scope,$http) {
        $scope.myAjaxCall = function(_url,_data) {
            $scope.$emit('loading',{ loading: true});
            $http.post(_url,_data).success(function(_response) {
                $scope.$emit('loading',{ loading: false });
            })
            .error(function(_error) {
                $scope.$emit('loading',{
                    loading : false,
                    msg     : _error.message
                });
            });
        }
    });

I managed to get the interceptor working. Apparently we CAN access the config file in all interceptor phases:
 
/******************************************
    SETUP BUSY/ERROR/DATA HTTP INTERCEPTOR
*******************************************/
.config(function($httpProvider){

    $httpProvider.interceptors.push(function($q) {
      return {

        request  : function(config) {

            if(config.ctrl){
                config.ctrl.busy   = true;
                config.ctrl.error  = false;
                config.ctrl.data   = undefined;
            }

            return config;
        },
        response : function(response) {

            if(response.config && response.config.ctrl){
                response.config.ctrl.busy = false;
                response.config.ctrl.data = response.data;
            }

            return response;
        },

        responseError : function(response){

            // note: maybe use a different error message for different kinds of responses?
            var error = response.status + " "+response.statusText+" - "+response.data;

            if(response.config && response.config.ctrl){
                response.config.ctrl.busy = false;
                response.config.ctrl.error = error;
            }

            return $q.reject(error);
        }
      };
    });

})