1.npm 官网

https://docs.npmjs.com/about-npm

2.下载nvm

https://github.com/nvm-sh/nvm
将这个install.sh文件下载下来
然后在cmd:

  1. ./install.sh

截屏2021-09-04 下午2.17.00.png
接着将一下代码写到 ~/.bash_profile 文件中

  1. export NVM_DIR="$HOME/.nvm"
  2. [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
  3. [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion

接着执行 source ~/.bash_profile

3.用nvm 下载npm

  1. nvm install 12
  2. nvm use 12
  3. nvm alias default 12
  4. npm install npm --global # Upgrade npm to the latest version