無法運行Rails 4.1.7服務器

Question

我已經完成以下命令：

1. 新的[app_name] [示例 演示]

2. cd演示[我已進入目錄]

3. rails -s（0r）rails-服務器

運行此命令時，出現以下錯誤。

/home/burhani/.rvm/gems/ruby-2.1.4/gems/execjs-2.2.2/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/burhani/.rvm/gems/ruby-2.1.4/gems/execjs-2.2.2/lib/execjs.rb:5:in `<module:ExecJS>'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/execjs-2.2.2/lib/execjs.rb:4:in `<top (required)>'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/uglifier-2.5.3/lib/uglifier.rb:3:in `require'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/uglifier-2.5.3/lib/uglifier.rb:3:in `<top (required)>'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/bundler-1.7.4/lib/bundler/runtime.rb:76:in `require'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/bundler-1.7.4/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/bundler-1.7.4/lib/bundler/runtime.rb:72:in `each'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/bundler-1.7.4/lib/bundler/runtime.rb:72:in `block in require'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/bundler-1.7.4/lib/bundler/runtime.rb:61:in `each'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/bundler-1.7.4/lib/bundler/runtime.rb:61:in `require'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/bundler-1.7.4/lib/bundler.rb:133:in `require'
from /home/burhani/demo/config/application.rb:7:in `<top (required)>'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/railties-4.1.7/lib/rails/commands/commands_tasks.rb:79:in `require'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/railties-4.1.7/lib/rails/commands/commands_tasks.rb:79:in `block in server'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/railties-4.1.7/lib/rails/commands/commands_tasks.rb:76:in `tap'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/railties-4.1.7/lib/rails/commands/commands_tasks.rb:76:in `server'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/railties-4.1.7/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/railties-4.1.7/lib/rails/commands.rb:17:in `<top (required)>'
from /home/burhani/demo/bin/rails:8:in `require'
from /home/burhani/demo/bin/rails:8:in `<top (required)>'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/spring-1.1.3/lib/spring/client/rails.rb:27:in `load'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/spring-1.1.3/lib/spring/client/rails.rb:27:in `call'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/spring-1.1.3/lib/spring/client/command.rb:7:in `call'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/spring-1.1.3/lib/spring/client.rb:26:in `run'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/spring-1.1.3/bin/spring:48:in `<top (required)>'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/spring-1.1.3/lib/spring/binstub.rb:11:in `load'
from /home/burhani/.rvm/gems/ruby-2.1.4/gems/spring-1.1.3/lib/spring/binstub.rb:11:in `<top (required)>'
from /home/burhani/demo/bin/spring:16:in `require'
from /home/burhani/demo/bin/spring:16:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'

我想做的事。

提前致謝。

Answer 1

您的錯誤Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable) Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable) Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)表示您沒有安裝Javascript運行時。 安裝Node.js（它也可用於其他用途）。 在Ubuntu上：

$ curl -sL https://deb.nodesource.com/setup | sudo bash -
$ sudo apt-get install -y nodejs

另外，您還必須安裝構建工具：

$ apt-get install -y build-essential

然后，您將能夠運行rails server命令。