change node version node code example
Example 1: upgrade node version
nvm install v12.16.2
Example 2: change node version
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.34.0/install.sh | bash
nvm install v12.16.2
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.34.0/install.sh | bash