Ruby on Rails安装JQuery

Question

我创建了一个新项目，我只是按照教程一步一步地在我的项目中安装jquery，但它不起作用。

    source 'https://rubygems.org'

    git_source(:github) do |repo_name|
      repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
      "https://github.com/#{repo_name}.git"
    end


    # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
    gem 'rails', '~> 5.1.4'
    # Use sqlite3 as the database for Active Record
    gem 'sqlite3'
    # Use Puma as the app server
    gem 'puma', '~> 3.7'
    # Use SCSS for stylesheets
    gem 'sass-rails', '~> 5.0'
    # Use Uglifier as compressor for JavaScript assets
    gem 'uglifier', '>= 1.3.0'
    # See https://github.com/rails/execjs#readme for more supported runtimes
    # gem 'therubyracer', platforms: :ruby

    # Use CoffeeScript for .coffee assets and views
    gem 'coffee-rails', '~> 4.2'
    # Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
    gem 'turbolinks', '~> 5'
    # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
    gem 'jbuilder', '~> 2.5'
    # Use Redis adapter to run Action Cable in production
    # gem 'redis', '~> 3.0'
    # Use ActiveModel has_secure_password
    # gem 'bcrypt', '~> 3.1.7'

    # Use Capistrano for deployment
    # gem 'capistrano-rails', group: :development

    group :development, :test do
      # Call 'byebug' anywhere in the code to stop execution and get a debugger console
      gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
      # Adds support for Capybara system testing and selenium driver
      gem 'capybara', '~> 2.13'
      gem 'selenium-webdriver'
    end

    group :development do
      # Access an IRB console on exception pages or by using  anywhere in the code.
      gem 'web-console', '>= 3.3.0'
    end

    # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
    gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

    gem 'jquery-rails'
    gem 'mysql2'

Project\App\Assets\JavaScripts\Application.js

    // 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, 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. JavaScript code in this file should be added after the last require_* statement.
    //
    // Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
    // about supported directives.
    //
    //= require rails-ujs
    //= require turbolinks
    //= require jquery
    //= require jquery_ujs
    //= require_tree .

Answer 1

//= require jquery
//= require jquery_ujs
// require turbolinks
//= require_tree .

在你的布局中：-

<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %>
<%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
<%= csrf_meta_tags %>

完成以上更改后，重新启动服务器。