koa.js yield order

example.js

var koa = require('koa');
var app = koa();

app.use(function *(next){
  console.log(1);
  yield next;
  console.log(6);
});


app.use(function *(next){
  console.log(2);
  yield next;
  console.log(5);
});

app.use(function *(next){
  console.log(3);
  yield next;
  console.log(4);
});

// response
app.use(function *(){
  console.log('add body')
  this.body = 'Hello World';
});

app.listen(3000);

run.sh

 node --harmony example.js
1
2
3
add body
4
5
6