One CLI for webpack must be installed. These are recommended choices, delivered as separate packages:

问题：

　　webpack安装过程出现问题，如下：

PS C:UsersAdministratorDesktopSepwebpack> webpack -v

One CLI for webpack must be installed. These are recommended choices, delivered as separate packages:
 - webpack-cli (https://github.com/webpack/webpack-cli)
   The original webpack full-featured CLI.
We will use "npm" to install the CLI via "npm install -D".
Do you want to install 'webpack-cli' (yes/no): no
You need to install 'webpack-cli' to use webpack via CLI.
You can also install the CLI manually.

解决方法：

//代码
npm install  webpack-cli -g
或者
cnpm install  webpack-cli -g

//案例
PS C:UsersAdministratorDesktopSepwebpack> cnpm install  webpack-cli -g

完成：

参考链接：

https://blog.csdn.net/cominglately/article/details/80543869