安装的webpack版本是4.9.1，webpack-cli版本号是2.1.4。运行webpack命令提示：
One CLI for webpack must be installed. These are recommended choices, delivered as separate packages:
webpack-cli (
https://github.com/webpack/we
…
The original webpack full-featured CLI.
webpack-command (
https://github.com/webpack-co
…
A lightweight, opinionated webpack CLI.
We will use “npm” to install the CLI via “npm install -D”.
Which one do you like to install (webpack-cli/webpack-command):
解决：
需要安装一个webpack-cli
npm install webpack-cli -g
就可以了
或者 npm install webpack-command -g （这个就没有测试了）
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