基于koa开发的
1.自动加载路由 2.body转换成json 3.http路由，不区分请求方法的
npm 包 ＝> github 开源库 https://www.npmjs.com/package/koa-autoload-router => https://github.com/einsqing/koa-autoload-router https://www.npmjs.com/package/koa-body-res => https://github.com/einsqing/koa-body-res https://www.npmjs.com/package/koa-http-router => https://github.com/einsqing/koa-http-router