这次我是想把写好的作业上传到github上，
- 首先我在github上面新建了一个repository
- 又在本地 git init建立了一个git仓库
- 然后在git add commit后，使用命令
git remote add origin 远程仓库地址
没有消息。。。然后我就想起我老师说，没有消息就是好消息，然后我就想上传代码
git push -u origin master
发现报错了 ，报的是
To https://github.com/tjucaokun/photowall.git! [rejected] master -> master (fetch first)
error: failed to push some refs to 'https://github.com/tjucaokun/photowall.git'
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. 这我感觉应该是冲突了，所以我想pull一下，然后他又报了错
remote: Counting objects: 3, done.
remote: Compressing objects: 100% (2/2), done. remote: Total 3 (delta 0), reused 0 (delta 0), pack-reused 0 Unpacking objects: 100% (3/3), done. From https://github.com/tjucaokun/photowall * branch HEAD -> FETCH_HEAD fatal: refusing to merge unrelated histories 上网搜索了一下，这是说这是两个不同的仓库，需要添加一句代码（如果你的分支是master）
git pull origin master ----allow-unrelated-histories
然后就完成了。
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