linux中安装nodeJs

1.下载 
    官网 https://nodejs.org/en/download/ 中查看最新版url
    wget 最新版url
2.解压 
    xz -d node-v8.12.0-linux-x64.tar.xz
    tar xvzf node-v8.12.0-linux-x64.tar
3.建立软链接( 设置为全局 /user/local/bin)
``
sudo rm  -rf /usr/local/bin/npm
sudo rm  -rf /usr/local/bin/node
sudo ln -s /var/jenkins_home/node_software/node-v8.12.0-linux-x64/bin/node /usr/local/bin/node  
sudo ln -s /var/jenkins_home/node_software/node-v8.12.0-linux-x64/bin/npm /usr/local/bin/npm
``
4.查看安装成功与否 
    node -v
    npm -v
5.安装cnpm
npm install -g cnpm --registry=https://registry.npm.taobao.org  
   sudo ln -s /var/jenkins_home/node_software/node-v8.12.0-linux-x64/bin/cnpm /usr/local/bin/