$ nvm install 7
$ npm i koa
$ node my-koa-app.json the official website of koa, I see that nvm, doesn"t understand the difference between nvm and npm
$ nvm install 7
$ npm i koa
$ node my-koa-app.json the official website of koa, I see that nvm, doesn"t understand the difference between nvm and npm
nvm manages the node version, and npm manages the node plug-in