将本地已有分支与远程已有分支 建立跟踪关系
git branch --track experimental origin/experimental
将本地已有分支推送到远程
git push experimental origin/experimental
远程没有有remote_branch分支并,本地已经切换到local_branch
git push origin --set-upstream local_branch:remote_branch
建立当前所在分支和远程已有分支之间的跟踪关系
git branch --set-upstream-to=origin/branch_name