摘要.
https://juejin.im/post/6844903928799199245
https://www.mindg.cn/?p=2733
https://www.cnblogs.com/wongbingming/p/10934356.html
https://blog.csdn.net/ls1645/article/details/79118464
django channles最佳实践
https://blog.csdn.net/ros_donggua/article/details/82628381
https://www.vimiix.com/post/2018/07/26/channels2-tutorial/
django查询优化建议
http://bbs.learnfuture.com/topic/6958
