Common NPM install errors

Commonly used npm command ：https://www.runoob.com/nodejs/nodejs-npm.html
npm file ： Chinese document

error 1： ERR: Please try running this command again as root/Administrator
explain ： Prompt to reinstall as Administrator , There is talk on the Internet about clearing the cache , Try and it won't work .

solve ： Direct reinstallation （ Mostly because of the Internet ）

 Or login user （ Try sometimes ） reinstall 
>npm login
Username: test
Password: ******
Email: *******
>npm install --save module

tip: If the installation still reports an error after logging in , Just try a few more times , Poor network may also lead to installation failure .（ The error prompt is to let you reinstall ）

error 2： ERR! network ‘proxy’ config is set properly
Incorrect translation of original text ： If there is an agent, configure it correctly .

solve ： We don't use proxy to set it to null.

>npm config set proxy null
>npm config set https-proxy null
 Set both agents to null  That's all right. .
 You can also find the configuration file .npmrc　 Modify in process .

error 3: npm publish

ERR！ You cannot publish over the previously published versions
err: You cannot publish on a previously released version . Change the version number every time you publish , To be modified version

npm config get registry   //  see 
npm config set registry=http://registry.npmjs.org  // npm Mirror image  
npm config set registry=https://registry.npm.taobao.org/  //  Taobao mirror 
npm config list 　// View the configuration to see the configuration directory ：　userconfig C:\Users\Administrator\.npmrc

If the current Taobao image release is unsuccessful

Switch 　npm config set registry=http://registry.npmjs.org

Then release .　 Make sure you are logged in .

error 4: npm Start project
ERR! webpack-dev-server --inline --progress --config build/webpack.dev.conf.js`
ERR! This is probably not a problem with npm. There is likely additional logging output above.

solve ： Clear cache , Reinstall dependency .

Delete node_modules and package-lock.json file
npm cache Introduce

>npm cache clear --force
>npm install