1. npm ERR! code E404 npm ERR! 404 Not Found - GET https://registry.npmjs.com/@mlamp%2fuser-info-dropdown - Not found
是看到這個博主說的解決方案才解決的→https://blog.csdn.net/weixin_42677762/article/details/112556234
原因是npm源指向的問題，須執行以下命令：
npm config set registry https://registry.npmjs.org/
然后就可以正常安裝了
2. 報錯如下：
npm ERR! code 1
npm ERR! path C:\Users\pando\Desktop\hn\ifactoryadmin\node_modules\node-sass
npm ERR! command failed
npm ERR! command C:\WINDOWS\system32\cmd.exe /d /s /c node-gyp rebuild
npm ERR! gyp info it worked if it ends with ok
npm ERR! gyp info using node-gyp@3.8.0
npm ERR! gyp info using node@14.16.0 | win32 | x64
npm ERR! gyp ERR! configure error
npm ERR! gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.
npm ERR! gyp ERR! stack at PythonFinder.failNoPython (C:\Users\pando\Desktop\hn\ifactoryadmin\node_modules\node-gyp\lib\configure.js:484:19)
npm ERR! gyp ERR! stack at PythonFinder.<anonymous> (C:\Users\pando\Desktop\hn\ifactoryadmin\node_modules\node-gyp\lib\configure.js:509:16)
npm ERR! gyp ERR! stack at callback (C:\Users\pando\Desktop\hn\ifactoryadmin\node_modules\graceful-fs\polyfills.js:299:20)
npm ERR! gyp ERR! stack at FSReqCallback.oncomplete (fs.js:183:21)
npm ERR! gyp ERR! System Windows_NT 10.0.19042
npm ERR! gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\pando\\Desktop\\hn\\ifactoryadmin\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild"
npm ERR! gyp ERR! cwd C:\Users\pando\Desktop\hn\ifactoryadmin\node_modules\node-sass
npm ERR! gyp ERR! node -v v14.16.0
npm ERR! gyp ERR! node-gyp -v v3.8.0
npm ERR! gyp ERR! not ok
解決方案：→https://blog.csdn.net/qcc0716/article/details/115463828
npm install node-sass
然后就可以正常安裝了