1 git push origin master 提示Everything up-to-date
表示本地仓库和远程仓库是一致的，没有更新，需要检查自己的提交。
2 git push origin master提示error: failed to push some refs to.....
hint: Updates were rejected because the remote contains work that you do
hint: not have locally.
表示远程仓库有的本地没有，需要先把远程仓库同步到本地，之后再执行提交。
先执行：
git pull origin master
后执行：
git push origin master