const Koa = require('koa')
const app = new Koa()

const Koa = require('koa')
const app = new Koa()

app.use( async ( ctx ) => {
  let url = ctx.url
  // 从上下文的request对象中获取
  let request = ctx.request
  let req_query = request.query
  let req_querystring = request.querystring

  // 从上下文中直接获取
  let ctx_query = ctx.query
  let ctx_querystring = ctx.querystring
  
  ctx.body = {
    url,
    req_query,
    req_querystring,
    ctx_query,
    ctx_querystring
  }
})

app.listen(3000)
console.log('[demo] request get is starting at port 3000')

// 使用ctx.body解析中间件
const Koa = require('koa')
const app = new Koa()
const bodyParser = require('koa-bodyparser')

// 使用ctx.body解析中间件
app.use(bodyParser())

app.use( async ( ctx ) => {

  if ( ctx.url === '/' && ctx.method === 'GET' ) {
    // 当GET请求时候返回表单页面
    let html = `
      <h1>koa2 request post demo</h1>
      <form method="POST" action="/">
        <p>userName</p>
        <input name="userName" /><br/>
        <p>nickName</p>
        <input name="nickName" /><br/>
        <p>email</p>
        <input name="email" /><br/>
        <button type="submit">submit</button>
      </form>
    `
    ctx.body = html
  } else if ( ctx.url === '/' && ctx.method === 'POST' ) {
    // 当POST请求的时候，中间件koa-bodyparser解析POST表单里的数据，并显示出来
    let postData = ctx.request.body
    ctx.body = postData
  } else {
    // 其他请求显示404
    ctx.body = '<h1>404！！！ o(╯□╰)o</h1>'
  }
})

app.listen(3000)
console.log('[demo] request post is starting at port 3000')