1.全局安装最新版本命令

npm install webpack -g 

2.全局安装指定版本

npm install webpack@3.6.0 -g 

3.全局安装webapck-cli

npm install webpack-cli -g

4.局部安装webpack

npm install webpack@3.6.0 --save-dev

5.删除全局和局部webpack-cli

npm uninstall -g webpack-cli

npm uninstall webpack-cli

 6.删除全局webpack

npm uninstall -g webpack

7.删除本地webpack

npm un webpack

8.查看webpack版本

webpack -v