Javascript 脚本中存在未定义的变量错误

我无法访问块中所需的变量，如图所示。我不明白为什么

define("appkit/controllers/me", ["appkit/utils/uploader", "exports"],
    function (__dependency1__, __exports__) {
        "use strict";
        var Uploader = __dependency1__["default"];
        var MeController;
        MeController = Em.ObjectController.extend({
            username: null,
            actions: {
                uploadProfilePic: function ($el) {
                    /*
                     * PROBLEM:
                     * 
                     * I dont understand why variable `Uploader` is not accessible over here.
                     * Could some one please explain?
                     * 
                     */
                     uploader = new Uploader(); // This line says "ReferenceError: Uploader is not defined".
                }
            }
        });

        __exports__["default"] = MeController;;
    }
);

我做错了什么

---

有人能解释一下原因吗？

在我看来，您声明了一个变量上传程序，但是，您尝试将其实例实例化为类。

函数作用域就是这样工作的。由于javascript中定义了作用域规则，您的内部函数extend无法访问变量上载程序。它扩展了Ember.Object。它应该表现得像一个班级。