For a Windows computer, download the node installation package from the official website, install it in a fool-proof way, and keep going next until the last step. Node -v can check the version number, but npm -v shows that the fs module is not found. What should I do? 
Waiting online
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npm installation failed. Reinstall node. npm will be automatically reinstalled
Execute the following command
npm install -g npm@next
npm install -g node-gyp
npm install -g nodemon
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