Angular - 服务继承

Question

我正在尝试提供扩展Angular $ http服务的代码，以创建更多面向业务的服务。

这是我的代码：

基本服务：

classes = angular.module("app", []);
classes.factory('baseService', function ($http, $q) {

    var apiUrl = "http://localhost/services/";

    // instantiate initial object
    var baseService = function () {
    };

    baseService.prototype.execute = function (webService, method, params) {
        params = typeof params !== "undefined" ? params : {};
        var deferred = $q.defer();
        var response = $http({
            method: "post",
            dataType: "json",
            data: JSON.stringify(params),
            headers: {
                'Content-Type': "application/json"
            },
            url: apiUrl + webService + "/" + method
        });

        response.success(function (data) {
            deferred.resolve(data);
        });
        response.error(function (data) {
            alert('Error');
        });

        // Return the promise to the controller
        return deferred.promise;
    };

    return baseService;
});

扩展服务：

home.factory("homeService", function (baseService) {
    // create our new custom object that reuse the original object constructor
    var homeService = function () {
        baseService.apply(this, arguments);
    };

    // reuse the original object prototype
    homeService.prototype = new baseService();
    return homeService;
});

控制器：

.....
homeService.prototype.execute("reports.asmx", "getWebReports").then(callback);

一切正常，但我希望在我的扩展服务中有一个内部函数来从控制器中调用它。另外，我可能在扩展服务中有多个功能。