解决nvm is not compatible with the npm config “prefix“ option: currently set to “/usr/local“

Mac系统每次打开终端都会提示 

nvm is not compatible with the npm config "prefix" option: currently set to "/usr/local"
Run `npm config delete prefix` or `nvm use --delete-prefix v15.11.0 --silent` to unset it.

The default interactive shell is now zsh.
To update your account to use zsh, please run `chsh -s /bin/zsh`.
For more details, please visit https://support.apple.com/kb/HT208050.

解决办法是删除并重新设置 nvm prefix

1. 运行 nvm use --delete-prefix v15.11.0 --silent 确保npm命令可以使用；

2. 运行 npm config delete prefix 删除 nvm prefix；

3. 运行 npm config set prefix $NVM_DIR/versions/node/v15.11.0 设置 nvm prefix 为v15.11.0。

注意：更改版本号，用错误消息中的提示的版本号。