我仔细地按照文档重新安装了捆绑包并重新启动了服务器多次，但是当我测试班级＆＃34; jumbotron＆＃34;时它似乎仍然不起作用。任何帮助赞赏。我无论如何都不是专家。
这是我的application.scss文件
/*
* This is a manifest file that'll be compiled into application.css, which will include all the files
* listed below.
*
* Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
* or any plugin's vendor/assets/stylesheets directory can be referenced here using a relative path.
*
* You're free to add application-wide styles to this file and they'll appear at the bottom of the
* compiled file so the styles you add here take precedence over styles defined in any styles
* defined in the other CSS/SCSS files in this directory. It is generally better to create a new
* file per style scope.
*/
@import "bootstrap-sprockets";
@import "bootstrap";
这是我的application.js文件
// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
// or any plugin's vendor/assets/javascripts directory can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// compiled file.
//
// Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
// about supported directives.
//
//= require jquery
//= require jquery_ujs
//= require turbolinks
//= require bootstrap-sprockets
//= require_tree .
我添加到我的gemfile中的内容..
gem 'haml', '~> 4.0', '>= 4.0.7'
gem 'bootstrap-sass', '~> 3.3', '>= 3.3.7'