您要求从远程 'origin' 拉取，但是未指定一个分支。因为这不是当前 分支默认的远程仓库，您必须在命令行中指定一个分支名。
原文：
i've been using github from a relatively short period, and I've always used the client to perform commits and pulls. I decided to try it from the git bash yesterday, and I successfully created a new repo and committed files.
today I did changes to the repository from another computer, I've committed the changes and now I'm back home and performed a git pull to update my local version and i get this:
设置git push和pull的默认远程分支
git branch --set-upstream-to=origin/master master
git pull