Reopen the terminal after NVM use or display the version before modification

nvm use After that, open the terminal again and display the version before modification .
To specify that the default version is the version you want ：

nvm alias default v12.18.3

nvm Commonly used instructions ：

nvm install #  Install the latest version nvm
nvm use #  Switch to the specified version node
nvm ls #  List all versions 
nvm current #  Show current version 
nvm alias #  Add aliases to different version numbers 
nvm unalias #  Delete the defined alias