（1）方法1：git fetch origin
（2）方法2（代码还需要）：git push origin
（3）方法3 （代码不需要）：git reset --hard origin/$branch
参考：
https://blog.csdn.net/Thousa_Ho/article/details/73350703
https://stackoverflow.com/questions/16288176/your-branch-is-ahead-of-origin-master-by-3-commits
可以先执行下git diff $branch origin/$branch 看下差异
(4) git pull --rebase
(5)git pull origin cherryPick
参考：https://blog.csdn.net/u010383937/article/details/72901675
Git Your branch is ahead of 'origin/master' by X commits解决方法
原文：https://www.cnblogs.com/zndxall/p/9571224.html