问题：
1 error: failed to push some refs to 2 hint: Updates were rejected because the tip of your current branch is behind 3 hint: its remote counterpart. Integrate the remote changes (e.g. 4 hint: ‘git pull ...‘) before pushing again. 5 hint: See the ‘Note about fast-forwards‘ in ‘git push --help‘ for details.
解决：不同的本地仓库上传至远程仓库导致上传出错的问题，在上传前输入以下代码先pull一次再push：
git pull origin master --allow-unrelated-histories
hint: Updates were rejected because the tip of your current branch is behind