text: const Koa = require('koa')
  const path = require('path')
  const app = new Koa()
  
  
  const {uploadFile} = require('./util/upload')
  
  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 upload demo</h1>
              <form method="POST" action="/upload.json" enctype="multipart/form-data">
                  <p>file upload</p>
                  <span>picName:</span><input name="picName" type="text" /><br/>
                  <input name="file" type="file" /><br/><br/>
                  <button type="submit">submit</button>
              </form>
          `
  
          ctx.body = html
  
      } else if (ctx.url === '/upload.json' && ctx.method === 'POST') {
  
          // 上传文件请求处理
          let result = {success: false}
          let serverFilePath = path.join(__dirname, 'upload-files')
  
          // 上传文件事件
          result = await uploadFile(ctx, {
              fileType: 'album', 
              path: serverFilePath
          })
  
          ctx.body = result
      } else {
  
          // 其他请求显示404
          ctx.body = '<h1>404！！！ o(╯□╰)o</h1>'
      }
  })
  
  app.listen(3000, () => {
      console.log('服务启动成功')
  })
  