jQuery完成后通过promise检索数据

Question

在准备好文档后，我想使用多个JS文件检索数据：

A.js

var dataController;
let loadedData_haz;

$(document).ready(function () {
    dataController = new DataController();
    loadedData_A = dataController.getloadedLanguage().A;
    fillForm_A(loadedData_haz);
});

B.js

var dataController;
let loadedData_B;

$(document).ready(function () {
    dataController = new DataController();
    loadedData_B = dataController.getloadedLanguage().B;
    fillForm_B(loadedData_B);
});

C.js

var dataController;
let loadedData_C;

$(document).ready(function () {
    dataController = new DataController();
    loadedData_C = dataController.getloadedLanguage().C;
    fillForm_C(loadedData_haz);
});

在我的data.controller.js文件中，我收到了上述文件的JSON对象和数据，例如...

data.controller.js

let dataService;

$(document).ready(function () {
    dataService = new DataService();
    loadLanguage();
});

function DataController() {

    if(!dataService) {
        dataService = new DataService();
    }

    /*
    getter
     */
    this.getloadedLanguage = function () {
        return dataService.getloadedLanguage();
    };
}

let loadLanguage = function () {
    var m = dataService.loadLanguagePromise();
    $.when(m).done(dataService.handleData);
};

在data.service.js中，我读取了TXT.file的内容

data.service.js

letloadLanguage;

function DataService() {

    /*
    getter
     */
    this.getloadedLanguage = function () {
        return loadedLanguage;
    };
}

DataService.prototype.handleData = function (response) {
    loadedLanguage = JSON.parse(response);
    localStorage.setItem('lang', response);
};

DataService.prototype.loadLanguagePromise = function () {
    return new Promise(function (resolve, reject) {
        $.ajax({
            url: "php/services/readLanguage.php",
            type: "GET",
            async: true,
            dataTyp: 'json',
            success: function (data) {
                resolve(data);
            },
            error: function (xhr, desc, err) {
                reject(Error("It broke"));
            }
        })
    })
};

每次我重新加载我的应用程序时，loadedData都是未定义的。有时，loadedData_B是未定义的，有时，loadedData_B和loadedData_C是未定义的。由于我的代码，这很正常。

因此，我想使用 new Promise 将data.service.js中的loadLanguage方法更改为回调函数。我认为这是正确的方法。任何改进或建议都非常欢迎！