curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.31.1/install.sh | bash

或

wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.31.1/install.sh | bash

立即生效

source ~/.bashrc

安装v6.10.3

nvm install v6.10.3

npm install forever -g

forever start index.js