$ /usr/bin/ruby -e /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
$ brew install nodebrew
$ nodebrew setup
$ echo 'export PATH=$HOME/.nodebrew/current/bin:$PATH' >> ~/.bash_profile
$ source ~/.bash_profile
$ nodebrew install-binary stable
$ nodebrew use stable
$ node -v
// ここでversionが表示されればok