專案開發中最常面臨的問題，就是新專案開發所使用的版本，與舊專案不一致的問題，最近開發剛好遇到新舊專案的 node.js 版本不同的問題，上網查了一下，有一款好用的 nvm 套件可以達成這個效果，這裡間單紀錄一下 nvm 的安裝方法與基本操作。
下載安裝 NVM
因為這邊使用的是windows系統，所以這邊附上 windows 的操作，有MacOS 需求的，可以前往NVM官網查看 MacOS 的相關安裝。
注意事項
前往官方中的 nvm-windows 中下載安裝檔 nvm-setup.exe ，並點開進行安裝。
步驟上基本都是直接按下一步，你會需要注意地方，會是在選擇安裝路徑時，需要考量你要放哪裡，如果你的電腦有鎖管理者權限，建議有安裝在C以外的地方。
NVM 基本指令用法
以下列出 NVM 的常用基本指令
| nvm -v | 查看 nvm 版本，同 nvm –version |
| nvm ls | 列出已安裝版本，同 nvm list。 |
| nvm ls available | 列出可以安裝的所有 node.js 版本，同 nvm list available。 |
| nvm use <版本號> | 指定目前使用的 node.js 版本 |
| nvm install <版本號> | 安裝指定版本的 node.js |
| nvm alias defaul t<版本號> | 預設使用 node.js 版本 |
NVM – 查詢 node.js 可安裝版本
輸入 nvm list available 或 nvm ls available 會列出目前可以安裝的版本。
NVM – 查詢 node.js 目前已安裝版本
輸入 nvm list 或 nvm ls 可以查看目前安裝了哪些版本的 node.js 。
NVM – 指定安裝 node.js 版本
使用 nvm install <版本號> 指定安裝想要的 node.js 版本。
例如，當我希望安裝的版本是 14.17，直接輸入使用 nvm install 14.17 ，然後按下 Enter 即可。
NVM – 切換指定版本
使用 nvm use <版本號> 可以直接切換至目前使用的版本，切換成功會出現以下畫面。
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