套件：npm-windows-upgrade
https://github.com/felixrieseberg/npm-windows-upgrade
- 要安裝這個，首先要使用有管理權限的 powershell
- 輸入下面的指令
Set-ExecutionPolicy Unrestricted -Scope CurrentUser -Force - 然後安裝 npm-windows-upgrade
npm install --global --production npm-windows-upgrade - 接著升級 npm
npm npm-windows-upgrade - 上面的指令也可以手動輸入，假設nodejs不是透過installer安裝的話，可以指定一下npm的所在位置
npm-windows-upgrade --npm-path "C:\nodejs"
其他可用參數:
-h, --help Output usage information
-V, --version Output the version number
-d, --no-dns-check Disable the internet connectivity test
-p, --no-prompt Disable the initial confirmation prompt
-n, --npm-path <path> (Optional) If passed, npm will be upgraded in the specified location
-v, --npm-version <version> (Optional) If passed, npm will be upgraded/downgraded to the specified version