npm``` npm install moment@2.22.2 npm init -y npm install npm

npm install moment@2.22.2
npm init -y
npm install
npm uninstall moment
npm install -D
npm install 包名 --save-dev

npm config get registry
npm config set registry=https://registry.npm.taobao.org
npm i nrm -g
set-ExecutionPolicy RemoteSigned
npm ls
nrm use taobao

npm install -g i5ting_toc
i5ting_toc -f .\day1.md -o
npm login
npm publish
npm unpulish 包名 --force
npm i express
npm install -g nodemon
npm i mysql
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';
npm i express-session

npm i jsonwebtoken express-jwt
jsonwebtoken用于生成jwt字符串
express-jwt用于将jwt字符串解析还原城json对象