After installing Ruby on Rails in centos 7

Yum install Ruby
Gem install rails-V
Without-V, the progress is not displayed, just like a dead machine, but not actually a dead machine.
Yum install ruby-devel
No plug-ins will be installed.
Yum install SQLite-devel
He will be stuck in SQLite later.

Compile coffeescript into javascript when Javascript is required for running. If no running occurs, an error is returned, indicating that noExecjs.
Rails-generatedGemfile, InstallTherubyracerThe GEM Code is commented out, and the previous comment is removed. And install gcc-C ++ before.

After installing Ruby on Rails in centos 7