router

const Router = require('koa-router')
const router = new Router()
router.get('/', async (ctx, next)=> {
    ctx.body = 'hello'
})
router.get('/user', async (ctx) => {
    ctx.body = 'user'
})
app.use(router.routes())

路由对象

funtion Router([options])

options

• prefix 路由前缀

实例化 router.method(path, handler)

• method get post...
• path / /user...
• handler 支持多个处理函数

router.get('/', ()=> {})
router.get('/1.txt', ()=> {})
router.get('/user/:userid', (ctx)=> {
    ctx.body = ctx.params.userid
})
router.get('/', async (ctx, next())=> {
    ctx.state.data = {
        logged: true
    }
    await next()
}, (ctx)=> {
    ctx.body = ctx.state.data
})

路由中间件

async function loggerMiddleware(ctx, next) {
    console.log(`${ctx.method}, ${ctx.path}, ${ctx.headers}`)
    await next()
}
app.use(loggerMiddleware) // 全局路由使用日志中间件

app.get('/user', loggerMiddleware, ()=> {
    //...
}) ///user路由下使用 日志中间件

路由前缀

路由前缀将同一个模块聚合在一起

const router = new Router({prefix: '/user'})
app.get('/', ()=>{}) // /user/  的路由
app.get('/list', ()=> {}) // /user/list 路由

模块化路由

• koa.js
  • routes
    • site.js
    • user.js

site.js

const Router = require('koa-router')

const router = new Router()
router.get('/',(ctx) => {
    ctx.body = 'index'
})
router.get('/help', (ctx) => {
    ctx.body = 'help'
})
module.exports = {
    router
}

user.js
const Router = require('koa-router')

const router = new Router({prefix: '/user'})
router.get('/', (ctx)=>{
    ctx.body = '/user'
}) 
router.get('/list', (ctx)=> {
    ctx.body = '/user/list'
}) 
module.exports = {
    router
}

koa.js
const site = require('./routes/site').router
const user = require('./routes/user').router
app.use(site.routes())
app.use(user.routes())