javascript - AngularJS:类型错误:无法读取未定义的属性 'then'

Question

首先，我是 Angular 的新手。我准备了一些 Web Api，我想从中获取一些数据。 我的服务功能获取日期(工作正常):

var _getRole = function () {
    $http.get(serviceBase + 'api/User/CurrentUserRoles').then(function (results) {
        return results;
    });
};

和 Controller :

var role = [];
authService.getRole().then(function (results) {
     role = results.data;...

在 Controller 的这个函数中我得到异常:

TypeError: Cannot read property 'then' of undefined
at n.$scope.login (http://localhost/.../app/controllers/loginController.js:27:30)
at ib.functionCall (http://localhost/.../Scripts/angular.min.js:199:303)
at Ec.(anonymous function).compile.d.on.f (http://localhost/.../Scripts/angular.min.js:216:74)
at n.$get.n.$eval (http://localhost/.../Scripts/angular.min.js:126:15)
at n.$get.n.$apply (http://localhost/.../Scripts/angular.min.js:126:241)
at HTMLButtonElement.<anonymous> (http://localhost/.../Scripts/angular.min.js:216:126)
at HTMLButtonElement.c (http://localhost/.../Scripts/angular.min.js:32:389)

请帮忙。谢谢。

Answer 1

您需要从 $http 返回自身的函数返回 promise 。

代码

var _getRole = function () {
    return $http.get(serviceBase + 'api/User/CurrentUserRoles');
};