git diff 比较工作区和暂存区的差别 git diff --cached 比较暂存区和本地库的差别git diff head 比较工作区和本地库的差别
https://blog.csdn.net/hualusiyu/article/details/78319126
分支覆盖：
https://www.cnblogs.com/justdoyou/p/11389623.html
