Javascript 使用qunit测试代码时出错

这是应用程序的代码。 所有rest函数都是从

init（）

调用的

如何开始使用qunit测试代码，因为如果我直接调用tests.js文件中的函数，它会显示“

ReferenceError:init未定义”

”

---

您的问题是，您正在一个内声明您的

init

函数，而该函数范围之外的任何对象都无法访问该函数。您可以通过使用一个非常简单的“模块”模式来解决这个问题，该模式从IFFE返回init方法并将其分配给变量

JS

// "namespace" for your application.
// Whatever your IFFE returns is assigned to the App variable
// this allows other scripts to use your application code
var App = (function ($, undefined) {

    // some code here 
    // and has variables and functions defined which get called inside this and are all interdependent.

    // example of a function inside your "application" js
    var printTitle = function () {
        var title = document.title;
        console.log(title);
    }

    var init = function () {
        printTitle();
    }

    // expose internal methods by returning them.
    // you should probably be exposing more than your init method
    // so you can unit test your code
    return {
        init: init
    }
})(jQuery);


// since we've returned the init function from within our iffe
// and that function is assigned to the App variable
// we are able to call App.init here
App.init(); // logs title

我发现以下文章有助于进行js测试：

---

您是如何运行测试的？通常，qUnit从加载以下内容的html文件运行：1。昆特2。应用程序的js文件3。您的测试js文件我正在从qunit.html文件运行测试。但问题是我不知道如何为现有的.js文件编写测试用例，需要一些指导。你的问题是你在一个函数中声明了你的init函数，而这个函数范围之外的任何东西都无法访问它。您需要以某种方式将其公开到全局范围。如何将其公开到全局范围？请您解释一下代码以及“名称空间”。我甚至尝试过使用您的代码。现在它表示未捕获的TypeError:无法调用undefinedTypeError的方法“init”：无法读取undefined的属性“init”。这个错误意味着什么？

// "namespace" for your application.
// Whatever your IFFE returns is assigned to the App variable
// this allows other scripts to use your application code
var App = (function ($, undefined) {

    // some code here 
    // and has variables and functions defined which get called inside this and are all interdependent.

    // example of a function inside your "application" js
    var printTitle = function () {
        var title = document.title;
        console.log(title);
    }

    var init = function () {
        printTitle();
    }

    // expose internal methods by returning them.
    // you should probably be exposing more than your init method
    // so you can unit test your code
    return {
        init: init
    }
})(jQuery);


// since we've returned the init function from within our iffe
// and that function is assigned to the App variable
// we are able to call App.init here
App.init(); // logs title