Javascript不在RubyonRails 5.2.3生产模式下随机加载

我还是RubyonRails的新手。这个框架对我来说真是太棒了。然而，由于我将它上传到了产品中，我仍然不理解为什么RubyonRails5.2.3在一些随机情况下不能正确加载JavaScript。有时，在第一次尝试打开页面时，它会正确加载，但当它没有正确加载时，用户甚至必须刷新几次，直到它正确加载为止。我还从浏览器中得到了一个错误，上面写着

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

获取…/assets/jquery-ui-1.8.16.custom.css net:：ERR_中止500

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

因为我使用了从CDN加载的jQueryUI1.12.1，所以我没有以任何方式导入或甚至没有编写一行代码来导入该文件

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

真正重要的是，为什么Ruby on Rails 5.2.3会随机出现 无法正确加载JavaScript？

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

这不仅发生在生产模式上，也发生在开发模式上。这个问题也发生在随机配置上

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

我将发布application.js和application.scss以及application.html.erb的头部部分，以了解我在这种情况下的错误：

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

application.js

//= require jquery3
//= require jquery-ui/core
//= require jquery-ui/widgets/slider
//= require rails-ujs
//= require popper
//= require cocoon
//= require social-share-button
//= require social-share-button/wechat
//= require rippleria/js/jquery.rippleria.min
//= require_tree .

/*
 *= require gmaps-auto-complete
 *= require social-share-button
 *= require jquery-ui/core
 *= require jquery-ui/slider
 */

 @import "pretty-checkbox/dist/pretty-checkbox";
 @import "rippleria/css/jquery.rippleria";

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

//= require jquery3

应用程序.scss

//= require jquery3
//= require jquery-ui/core
//= require jquery-ui/widgets/slider
//= require rails-ujs
//= require popper
//= require cocoon
//= require social-share-button
//= require social-share-button/wechat
//= require rippleria/js/jquery.rippleria.min
//= require_tree .

/*
 *= require gmaps-auto-complete
 *= require social-share-button
 *= require jquery-ui/core
 *= require jquery-ui/slider
 */

 @import "pretty-checkbox/dist/pretty-checkbox";
 @import "rippleria/css/jquery.rippleria";

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

//= require jquery3

application.html.erb

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

---

如果你们能让我知道我能做些什么来避免这种随机行为，我将不胜感激？非常感谢您抽出时间。：）

没关系，我已经解决了这个问题。RubyonRails的主要问题是，如果我们使用Rails5.2.3提供的JQuery，那么依赖项如下所述

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

gem 'jquery-rails'

它将生成具有以下行的应用程序CSS文件

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

@import 'jquery-ui.1.8.6.custom.css'

虽然assets文件夹没有上面写的文件，但它会非自愿地导入JQuery UI自定义CSS

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

解决方案：

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

我建议您不要使用Rails 5.2.3提供的JQuery，并使用CDN方法更改JQuery以获得最佳性能。因此，您可以删除application.js上的以下行

//= require jquery3
//= require jquery-ui/core
//= require jquery-ui/widgets/slider
//= require rails-ujs
//= require popper
//= require cocoon
//= require social-share-button
//= require social-share-button/wechat
//= require rippleria/js/jquery.rippleria.min
//= require_tree .

/*
 *= require gmaps-auto-complete
 *= require social-share-button
 *= require jquery-ui/core
 *= require jquery-ui/slider
 */

 @import "pretty-checkbox/dist/pretty-checkbox";
 @import "rippleria/css/jquery.rippleria";

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

//= require jquery3

然后在application.html.erb上加载JQuery在application.js之前的顺序，如下所示：

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<%= javascript_include_tag 'application', async: Rails.env.production?, :cache => 'cached/all' %>

'缓存/所有'%>

希望我的解决方案能有所帮助。：）

<%= stylesheet_link_tag    'sub/style' %>
<%= stylesheet_link_tag    'sub/components.min' %>
<%= stylesheet_link_tag    'sub/custom' %>
<%= stylesheet_link_tag    'sub/chat.min' %>

<%= javascript_include_tag 'application', async: Rails.env.production? %>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/galleria/1.5.7/galleria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.3/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js"></script>