使用create-react-app命令创建一个react项目，运行npm run eject生成配置文件，报了下面的错：
Remove untracked files, stash or commit any changes, and try again.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] eject: `react-scripts eject`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] eject script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\lenovo\AppData\Roaming\npm-cache\_logs\2019-09-01T04_03_50_129Z-debug.log
主要问题是脚手架添加.gitgnore文件，但是却没有本地仓库，按照以下顺序操作就可以正常使用
create-react-app demo
cd demo
git init
git add .
git commit -m 'Saving before ejecting'
npm run eject
