从函数内部，类内部，模块内部访问角度服务

module Helper {

    export class ListController {
        static batchDelete(data) {
            // Do something with Angular's $http ...
            $http.post(data)
        }
    }
}

// On click function
Helper.ListController.batchDelete(toBeDeleted);
module Helper {

    export class ListControlle