先查看是否安装npm : npm -v
全局安装create-react-app ： npm install create-react-app -g
遇到错误：
npm ERR! The operation was rejected by your operating system.
npm ERR! It's possible that the file was already in use (by a text editor or
npm ERR! or that you lack permissions to access it.
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解决办法
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找到 C:\Users\账户.npmrc 并删掉.npmrc，这里要设置显示隐藏文件才能看到。
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2.运行： npm cache clean --force
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3.再次运行：npm install create-react-app -g 成功
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创建项目：create-react-app testproject 遇到：npm ERR! code ERR_SOCKET_TIMEOUT
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解决办法： npm install rxjs 再次运行：create-react-app testproject 成功
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vscode 安装辅助插件
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