AngularJS中控制器之間通信的正確方法是什麼？ - What's the correct way to communicate between controllers in AngularJS?

問題：

What's the correct way to communicate between controllers? 控制器之間通信的正確方法是什麼？

I'm currently using a horrible fudge involving window : 我目前正在使用涉及window的可怕軟糖：

function StockSubgroupCtrl($scope, $http) {
    $scope.subgroups = [];
    $scope.handleSubgroupsLoaded = function(data, status) {
        $scope.subgroups = data;
    }
    $scope.fetch = function(prod_grp) {
        $http.get('/api/stock/groups/' + prod_grp + '/subgroups/').success($scope.handleSubgroupsLoaded);
    }
    window.fetchStockSubgroups = $scope.fetch;
}

function StockGroupCtrl($scope, $http) {
    ...
    $scope.select = function(prod_grp) {
        $scope.selectedGroup = prod_grp;
        window.fetchStockSubgroups(prod_grp);
    }
}

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解決方案：

參考一： https://stackoom.com/question/lDMS
參考二： What's the correct way to communicate between controllers in AngularJS?