undefined|0|ReferenceError:严格模式禁止隐式创建全局属性“csrf_token" [英] undefined|0|ReferenceError: Strict mode forbids implicit creation of global property 'csrf_token'

问题描述

所以，这是我遇到的一个非常有趣的问题.

So, this was quite an interesting problem I have been running into.

我目前正在构建一个backbone.js - Rails 应用程序.通常只是为了学习目的而构建它.我(就像任何优秀的 Rails 开发人员一样)在 TDD/BDD 方面尽我所能，但我在使用水豚时遇到了问题.

I am currently building a backbone.js - Rails app. Generally just building this for learning purposes. I am (like any good rails dev) doing my best at TDD/BDD and I ran into a problem with capybara.

我有一个只测试 root_path 工作的集成规范(主干历史开始，显示初始信息等......).

I have an integration spec that merely tests root_path works (Backbone history starts, displays initial information, etc...).

require 'spec_helper'

describe "RentalProperties", js: true do
  describe "GET /" do
    it "should show a list of properties" do
      visit root_path
      eventually{page.should have_content("Something")}
    end
  end
end

我正在用 jasmine、sinon 和 capybara/rspec/webkit 运行测试.我松散地关注了thoughtbot 的Rspec on Rails"一书(顺便说一句很棒的书)和本教程:http://tinnedfruit.com/2011/03/03/testing-backbone-apps-with-jasmine-sinon.html.

I am running tests with jasmine, sinon, and capybara/rspec/webkit. I am loosely following both the "Rspec on Rails" book by thoughtbot (awesome book by the way), and this tutorial: http://tinnedfruit.com/2011/03/03/testing-backbone-apps-with-jasmine-sinon.html.

在运行上述规范时，我遇到了这个错误:

When running the above spec, I came across this error:

undefined|0|ReferenceError: Strict mode forbids implicit creation of global property 'csrf_token'

我花了很长时间才解决这个问题，因为这个错误真的没有谷歌可以解决的问题.

I took a long time sorting this out because there's really nothing google-able for this error.

最终我偶然发现在 JS 中使用了使用严格模式".本质上，这将使用一些新的 EMCA5 脚本约定.它将捕获更多的编码漏洞，并阻止您访问全局变量.都是好东西.

Eventually I stumbled across using "use strict-mode" in JS. Essentially this will use some new EMCA5 script conventions. It will catch more coding bloopers, and keep you from accessing global variables. All good things.

所以我检查，在我的 sinon.js 文件中，我看到:

So I check, and in my sinon.js file, I see:

"use strict";

在文件的第 36 行.瞧，我注释掉了该行，我的测试工作正常.

on line 36 of the file. Lo and behold I comment out the line, and my tests work just fine.

这是我的问题:为什么使用严格搞乱 csrf?我假设这与我的 rails 布局中的 csrf_meta_tags 有关.如果可能的话，我想将此行放回 sinon js 中，因为我认为它是正确的做法"

Here is my question: Why did use strict mess up csrf? I am assuming this has something to do with csrf_meta_tags in my rails layout. If possible I would like to put this line back in sinon js as I assume its the "right thing to do"

有没有人有这方面的更多信息?我提前感谢任何细节！

Does anyone have more information on this? I appreciate any details in advance!!

推荐答案

它告诉您正在将一个值分配给一个名为 csrf_token 的变量，该变量尚未声明，例如

It is telling you that a value is being assigned to a variable called csrf_token that has not been declared, e.g.

csrf_token = 'foo';

在非严格模式下，这将在执行该行代码时创建名为 csrf_token 的全局对象(通常称为全局变量)的属性.

In non–strict mode, that will create a property of the global object (usually called a global variable) called csrf_token when that line of code is executed.

在严格模式下，它会抛出你看到的错误，因为严格模式阻止了全局变量的隐式创建.您还可以通过包含以下内容来修复它:

In strict mode, it will throw the error you see because strict mode prevents the implicit creation of global variables. You could also fix it by including:

var csrf_token;

在与错误来自的代码相同的脚本元素中的全局上下文中的任何位置，或前一个脚本元素.

anywhere in a global context in the same script element as the code the error comes from, or a previous script element.

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