如果需要安装新的包，在Package.json添加或者执行npm i [包名称] -D (-D表示--save-dev: Package will appear in your devDependencies.)

Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js' package ecosystem, npm, is the largest ecosystem of open source libraries in the world.