Linux (centos) uses npm to install yarn

1. Install yarn in npm mode, the premise is to install nodejs first, and make sure that the npm node command can be
   installed globally with node
2. install yarn

npm install yarn -g

3. If the test yarn prompts command not found, soft link the yarn command to the global

ln -s /root/node-v10.16.3-linux-x64/bin/yarn /usr/local/bin/yarn