1. const koa=require("koa");
    2. const app=new koa();
    3. const router=require("koa-router")();
    4. router.get("/playlist",async ctx=>{
    5. /* get */
    6. console.log(ctx.qurey);
    7. })
    8. router.get("/subject/:id",async ctx=>{
    9. /* 动态路由 */
    10. console.log(ctx.params);
    11. })
    12. app.use(router.routes());
    13. app.listen(4040)