执行rails server 出现in `autodetect': Could not find a JavaScript runtime.

执行rails server

in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)

解决方案1：在GemFile（文件的位置在项目的首页中） 文件的末尾加上gem 'execjs'?

gem 'therubyracer'

之后执行bundle install

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解决方法2：

安装nodejs

lijg@lijg-desktop:~/workruby/helloapp$ sudo apt-cache search nodejs
[sudo] password for lijg:
coffeescript - interpreter and compiler for the CoffeeScript language
nodejs - Node.js event-based server-side javascript engine
nodejs-dbg - Node.js event-based server-side javascript engine (debug)
nodejs-dev - Development files for Node.js