环信部分完结

https://www.jianshu.com/p/ff34d77a42bc
https://www.jianshu.com/p/ba3dee791584
http://www.imgeek.org/article/825308673
http://www.imgeek.org/article/825307886
http://www.imgeek.org/article/825308536

最主要的功能和效果已经实现，感谢上文链接中文章的作者。