路由

PPG007 ... 2023-5-9 Less than 1 minute

# 路由

Koa 本身不支持路由，这里使用 koa-router 中间件：

yarn add koa-router
yarn add -D @types/koa-router

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# 嵌套路由

import koa =  require('koa');
const app = new koa();
import Router = require('koa-router');
const routerv1 = new Router({
    prefix: '/v1'
});
routerv1.get('/user', (ctx, next) => {
    ctx.response.body = 'user v1';
});
const routerv2 = new Router({
    prefix: '/v2'
});
routerv2.get('/user', (ctx, next) => {
    ctx.response.body = 'user v2';
});
const router = new Router();
router.use(routerv1.routes()).use(routerv2.routes());
app.use(router.routes()).use(router.allowedMethods());
app.listen(8080, '0.0.0.0');

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# 同一路由多个中间件

routerv1.get('/user', async (ctx, next) => {
    console.log('user v1')
    await next()
}, (ctx, next) => {
    ctx.response.body = 'user v1';
});

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# url 参数

routerv2.get('/user/:id', (ctx, next) => {
    // url: /v2/user/PPG007
    console.log(ctx.params['id'])
    ctx.response.body = 'user v2';
});

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使用 router.param 方法：

routerv2.param('id', async (id, ctx, next) => {
    console.log(id);
    await next();
}).get('/user/:id', (ctx, next) =>{
    ctx.response.body = ctx.params['id'];
})

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中间件错误处理