• Express 式路由使用app.get, app.put, app.post 等
  • Named URL parameters and regexp captures
  • String or regular expression route matching
  • Named Routes with URL generation
  • Responds to OPTIONS request with allowed methods
  • Support for 405 Method Not Allowed and 501 Not Implemented
  • Multiple route middleware
  • Multiple routers

安装

npm install koa-router
`</pre>

### 使用

<pre>`var koa = require("koa"),
    router = require("koa-router"),
    app = koa();

app.use(router(app))
`</pre>

After the router has been initialized you can register routes:

<pre>`app.get("/users/:id", function*(next){
  var user = yield User.findOne(this.params.id);
  this.body = user;
});
`</pre>

### 多路由

You can use multiple routers and sets of routes by omitting the `app` argument. For example, separate routes for two versions of an API:

<pre>`var koa = require("koa"),
    mount = require("mount"),
    Router = require("koa-router");

var app = koa();

var APIv1 = new Router();
var APIv2 = new Router();

APIv1.get("/sign-in", function*(){
  // ...
})
APIv2.get("/sign-in", function*(){
  // ...
})

app.use(mount("/v1", APIv1.middleware())).use(mount("/v2", APIv2.middleware()));
`</pre>

### 链

The http methods(get, post, etc) return their `Router` instance, so routes can be chained as you're used to with express:

<pre>`var api = new Router();

api.get("/foo", showFoo).get("/bar", showBar).post("/foo", createFoo)