简单搭建koa服务器

//需要安装npm i koa以及npm i koa-router

//引用相应的

const Koa = require('koa');

const router = require('koa-router')();

const app = new Koa();

//解决跨域

const cors = require('koa-cors');

router.post('/signin', async (ctx, next) => {

    ctx.response.body = 'Hello World';

});

app.use(cors());

app.use(router.routes());

app.listen(3000);