Install nvm, node js

Go to github of nvm

https://github.com/creationix/nvm

copy script for installing nvm (v0.33.6 is the version when write this doc)

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.6/install.sh | bash

Go to bash and paste command to install

Install node js, v8.9.0 is the version when write this doc

nvm install v8.9.0