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 * @Description: README
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# `Koa` 使用
## 配置环境
1. 安装`koa`
```shell
npm install --save koa
``` 
3. 启动`koa`服务
```javascript
const Koa = require('koa')

const app = new Koa()

app.use(async ctx => { ctx.body = 'hello world'})

app.listen(3000)

``` 
5. 添加`koa`路由插件