1. 1.上传scala安装包到/usr/local/目录 解压
    2. tar -zxvf 
    3. 2.vim /etc/profile  配置环境变量 
    4. export SCALA_HOME=/usr/local/scala
    5. export PATH=$PATH:$SCALA_HOME:bin
    7. :wq保存
    8. source /etr/profile