koa2初探（二）路由 koa-router

https://blog.csdn.net/gggingsss/article/details/79913668

koa2初探（二）路由 koa-router

2018年04月12日 15:06:58 Karthus-gm 阅读数：3697 标签： koa2koa-router 更多

个人分类： Node.js

koa-router英文文档

安装

npm install koa-router

• 1

使用example

const Koa = require('koa')
// 注意 require('koa-router') 返回的是函数:
const router = require('koa-router')()
const app = new Koa()

 // 添加路由
 router.get('/', async (ctx, next) => {
    ctx.response.body = '<h1>index page</h1>'
})

router.get('/home', async (ctx, next) => {
    ctx.response.body = '<h1>HOME page</h1>'
})

router.get('/404', async (ctx, next) => {
    ctx.response.body = '<h1>404 Not Found</h1>'
})

 // 调用路由中间件
 app.use(router.routes())

app.listen(3000, ()=>{
  console.log('server is running at http://localhost:3000')
})

---

路由方法

get | post | put | delete | del | all

*all代表匹配所有，一般放在中间件的末尾

重定向

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

•  

---

动态路由

router.get('/users/:id', (ctx, next) => {
 // ...
});

类似于vue-router，可以将参数直接以 /path/parma 的形式传递参数

路由参数被捕获并添加到ctx.params

router.get('/:category/:title', (ctx, next) => {
  console.log(ctx.params);
  // => { category: 'programming', title: 'how-to-node' }
});

---

命名路由

给路由命名，可以在开发过程中生成URl并重新命名URL

router.get('user', '/users/:id', (ctx, next) => {
 // ...
});

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

---

多个中间件

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

---

路由嵌套

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

posts.get('/', (ctx, next) => {...});
posts.get('/:pid', (ctx, next) => {...});
forums.use('/forums/:fid/posts', posts.routes(), posts.allowedMethods());

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

---

路由前缀

类似于vue-router的子路由

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

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