https://github.com/shidenggui/easyquotation
https://github.com/shidenggui/easytrader
这篇文章写得很好: https://www.zhihu.com/question/41086914/answer/98009431?utm_source=wechat_session
https://edu.csdn.net/course/detail/24668
从一个群里某个人那买的,