使用git push -u origin master，把本地代碼推送到遠程倉庫，出現如下錯誤
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.
這是因爲本地的代碼不是最新的，把遠程master最新的代碼更新到本地就可以了，
使用命令： git pull origin master
之後又出現了錯誤：fatal: refusing to merge unrelated histories
解決方法：使用以下命令，強制合併
git pull origin master --allow-unrelated-histories
後面加上 --allow-unrelated-histories ， 把兩段不相干的 分支進行強行合併
後面再push就可以了