nodejs的koa2框架

官网文档

cnpm i --save-dev koa2 koa-router koa-body koa-static request

npm install --save koa2

const koa2 = require('koa2');
const Router = require('koa-router');
const router = new Router();
const app = new koa2();

const Index = router.get('/', async (ctx, next) =>{
  await next();
  ctx.status = 200;
  ctx.type= 'html';
  ctx.body = "<h1>hello</h1>"
}).routes();

app.use(Index);

app.listen(1995);

npm i koa-router --save 路由控件

const Index = require('./router/index.js');
app.use(Index);// 挂载路由

// router/index.js

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

router.get('/', async (ctx, next) =>{
  await next();
  ctx.status = 200;
  ctx.type= 'json'
  ctx.body = {msg:''};

}).routes();

module.exports = router

npm i koa-views --save 加载静态页面

var views = require('koa-views');
// 在所有路由之前使用
app.use( views(path.join( __dirname, 'view' )) );

npm i --save koa-static 加载静态资源

const static = require('koa-static');
app.use(static('./public'));// 加载静态文件

获取ip

  console.log( Object.getOwnPropertyNames(ctx.request) );
   console.log(ctx.request.ip)