分支查看：git branch
分支创建：git branch <branchName>
分支切换：git checkout <branchName>

分支拉取：git pull origin <branchName>
分支克隆：git clone -b <branchName> git@gitlab.alibaba-inc.com:xxx.git

分支提交：
git add README.md
git commit -m"update readme file"
git push -u origin <branchName>

合并分支到主干：
git checkout master
git merge <branchName>
git merge <branchName>

! [rejected] branchName -> branchName (non-fast-forward)
先执行下面操作：
git fetch
git merge