express中间件是个普通的函数，执行中间件是个阻塞的过程

  • expres执行 next() 是个阻塞的过程
  • express的异步，会破坏洋葱模型，express对洋葱模型兼容的不好

koa洋葱模型

  • await之前是穿入
  • await之后是穿出

express

  • request
  • response

request

  1. query
  2. param()
  3. route
  4. cookies
  5. signedCookies
  7. get()
  8. accepts()
  9. acceptsCharset()
  10. acceptsLanguage()
  11. is()
  13. ip
  14. ips
  15. path
  16. host
  17. fresh
  19. state
  20. xhr
  21. secure
  22. subdomains
  23. originUrl

response

  1. status()
  2. set()
  3. get()
  4. redirect()
  5. cookie()
  7. clearCookie()
  8. location()
  9. send()
  10. json()
  11. jsonp()
  12. type()
  14. format()
  15. attchment()
  16. sendfile()
  17. download()
  18. links()
  20. locals
  21. render()