centos 7 installation nodejs 12.x install gcc ++ 7.3 upgrade

 yum方式安装        参考 https://github.com/nodesource/distributions

1,    curl -sL https://rpm.nodesource.com/setup_12.x | bash -

2,    sudo yum install -y nodejs 


such steps need gcc ,, 
centos g ++ 7.3.0 Upgrade

Commands are sequentially executed steps: 

the sudo yum the install CentOS-SCL-Release

sudo yum install devtoolset-7

scl enable devtoolset-7 bash