Rails服务器无法启动->找不到JavaScript运行时 [英] Rails server does not start -> Could not find a JavaScript runtime

问题描述

我在问题"文件夹中创建了一个新的Rails应用程序，当我想对红宝石"进行操作时，出现了错误.任何帮助将不胜感激

I created a new rails app in folder 'issues' and when I wanted to 'ruby s' I got an error. Any help will be much appreciated

[thiago@netbox issues]$ rails s
/home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/execjs-1.4.0/lib/execjs/runtimes.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/execjs-1.4.0/lib/execjs.rb:5:in `<module:ExecJS>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/execjs-1.4.0/lib/execjs.rb:4:in `<top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `<top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `<top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `<top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
    from /home/thiago/Documents/wdi/rails_practice/issues/config/application.rb:7:in `<top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/commands.rb:53:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/commands.rb:53:in `block in <top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

我将'therubyracer'宝石添加到我的Gemfile中，然后'$ bundle install'起作用了！

I added 'therubyracer' gem into my Gemfile and then '$ bundle install' Works!

Gemfile
source 'https://rubygems.org'

gem 'rails', '3.2.8'
gem 'sqlite3'

group :assets do
gem 'sass-rails',   '~> 3.2.3'
gem 'coffee-rails', '~> 3.2.1'
gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'
gem 'therubyracer' # added

推荐答案

一月份我开始在Rails上工作时，在Windows和Ubuntu上都遇到了相同的错误.该错误非常简单.您需要一个JavaScript运行时环境才能启动服务器.

I had the same error both for Windows and Ubuntu when I started working on Rails in January. The error is pretty straightforward. You need a JavaScript runtime environment for the server to start.

有很多解决方案.我在Ubuntu上使用的是安装NodeJS.

There are a number of solutions to this. The one I use on Ubuntu is to install NodeJS.

在Ubuntu上，您将运行以下内容来安装NodeJS:

On Ubuntu you'd run something like the following to install NodeJS:

sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get -y update
sudo apt-get -y install nodejs

这些是我用来执行的命令，因为它将安装最新版本的NodeJS稳定版本，但是您可以运行 sudo apt-get -y install nodejs 即可.

Those are the commands I use to do it as it will install the latest stable version of NodeJS, but you can just run sudo apt-get -y install nodejs and be fine.

在Windows上，我使用的答案(可能还有其他答案)是编辑Gemfile以安装therubyracer.我现在在Rails 4.0 RC1应用程序上工作，它们都在刚刚注释掉的Gemfile中已经有 gem'therubyracer'，平台::ruby .

On Windows, the answer I used, and there may be others, was to edit your Gemfile to install therubyracer. I work on Rails 4.0 RC1 apps right now and they all have gem 'therubyracer', platform: :ruby already in the Gemfile just commented out.

如果您在Windows上运行，只需在Gemfile中添加 gem'therubyracer'，我敢打赌.然后运行捆绑安装.

You can just go add gem 'therubyracer' in your Gemfile if you're running on Windows and that will get you running I'd bet. Then run bundle install.

这篇关于Rails服务器无法启动->找不到JavaScript运行时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！