本地获取远端分支，并切换到此分支

git checkout -b 本地分支名 origin/远程分支名

• 第一步 git fetch 先拉取遠端所有分支
• 第二步 git checkout -b dev origin/dev 切換到遠端分支

如果出现提示： cannot update paths and switch to branch xx at the same time. Did you intend to checkout origin/xx which can not be resolved as commit?
需要先git fetch