KOA 学习（七） 路由koa-router

一、基本用法

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

router.get('/', function *(next) {...});

app
  .use(router.routes())
  .use(router.allowedMethods());

二、router.get|put|post|patch|delete

router
  .get('/', function *(next) {
    this.body = 'Hello World!';
  })
  .post('/users', function *(next) {
    // ...
  })
  .put('/users/:id', function *(next) {
    // ...
  })
  .del('/users/:id', function *(next) {
    // ...
  });

三、多个中间件例子

router.get(
  '/users/:id',
  function *(next) {
    this.user = yield User.findOne(this.params.id);
    yield next;
  },
  function *(next) {
    console.log(this.user);
    // => { id: 17, name: "Alex" }
  }
);

四、嵌套路径

var forums = new Router();
var posts = new Router();

posts.get('/', function *(next) {...});
posts.get('/:pid', function *(next) {...});
forums.use('/forums/:fid/posts', posts.routes(), posts.allowedMethods());

// responds to "/forums/123/posts" and "/forums/123/posts/123"
app.use(forums.routes());

五、路由前缀

var router = new Router({
  prefix: '/users'
});

router.get('/', ...); // responds to "/users"
router.get('/:id', ...); // responds to "/users/:id"

六、重定向

router.redirect('/login', 'sign-in');

还有另外一种写法

router.all('/login', function *() {
  this.redirect('/sign-in');
  this.status = 301;
});

七、router.url(name, params)

router.get('user', '/users/:id', function *(next) {
 // ...
});

router.url('user', 3);
// => "/users/3"

router.url('user', { id: 3 });
// => "/users/3"