node 后台测试 demo

# install dependencies
$ yarn install
# or
$ npm install
# 实施编译 ts
$ yarn run watch
# or
$ npm run watch
# serve with hot reload at localhost:3000
$ yarn run dev
($ yarn run serve)
# or
$ npm run dev
($ npm run serve)
# build for production
$ yarn run build
# or
$ npm run build