koa2学习(二) 中间件router

中间件 koa-router

安装 

npm install --save koa-router

使用 

const Koa = require('koa');
const Router = require('koa-router');
const app = new Koa();
const router = new Router();
router.get('/', function (ctx, next) {
    ctx.body="Hello Word";
});
app.use(router.routes())
　　.use(router.allowedMethods());


app.listen(3000,()=>{
  console.log('starting at port 3000');
});