yum install -y epel-release
/usr/bin/yum install -y nodejs
yum remove nodejs -y
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.29.0/install.sh | bash
command -v nvm
nvm ls-remote
nvm install v6.12.3
cnpm
/usr/bin/npm install -g cnpm --registry=https://registry.npm.taobao.org
registry =https://registry.npm.taobao.org