React启动报警If you would prefer to ignore this check, add SKIP_PREFLIGHT_CHECK=true to an .env file

🏐🏐闻者伤心🏐🏐

🏉🏉见者落泪🏉🏉

⚽⚽启动失败⚽⚽

🏀🏀功亏一篑🏀🏀

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• 使用cnpm
  npm install -g cnpm --registry=https://registry.npm.taobao.org
• 不行就换着试一下
  npm config set registry http://r.cnpmjs.org/
  npm config set registry https://registry.npmjs.org/
  npm config set registry https://registry.npm.taobao.org

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1. If you would prefer to ignore this check, add SKIP_PREFLIGHT_CHECK=true to an .env file in your project.

按照它的说法，在根目录创建文件.env

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2. TypeError: Class extends value undefined is not a constructor or null

npm add webpack@4.1.0

3. Cannot read property ‘createHash’ of undefined

npm install webpack@^4.43.0 -D

4. ./src/CSS/coreuiStyle.scss (./node_modules/css-loader/dist/cjs.js??ref–5-oneOf-6-1!./node_modules/postcss-loader/src??postcss!./node_modules/resolve-url-loader??ref–5-oneOf-6-3!

npm uninstall node-sass
npm install node-sass@4.14.1 -D

5. 缺啥装啥

npm install xxxx -D

6. 补充知识

命令&参数的完整写法	简写	含义
npm install xxx	npm i xxx	本地安装xxx包
–global	-g	全局安装，安装后可直接使用相应包里面提供的命令
–save	-S	本地安装，安装版本写入package.json的dependencies
–save-dev	-D	本地安装，安装版本写入package.json的devDependencies