CentOs7 安装 nodejs

官网安装步骤：

node.js 6

curl --silent --location https://rpm.nodesource.com/setup_6.x | sudo bash -

Alternatively for Node.js 8:

curl --silent --location https://rpm.nodesource.com/setup_8.x | sudo bash -

Then install:

sudo yum -y install nodejs

Optional: install build tools

To compile and install native addons from npm you may also need to install build tools:

sudo yum install gcc-c++ make
# or: sudo yum groupinstall 'Development Tools'