落叶无声的专栏

npm install --save:  The package will be added to the dependencies list which contain packages that are used in production mode. npm install --save-dev:  The package will be added to the devDepen

The npm start command runs a command specified in the package's "start" property of its "scripts" object. If no "start" property is specified on the "scripts" object, it will run node server.js