添加項目A的遠程倉庫地址到upstream
git remote add upstream <你朋友項目A的倉庫地址>
把項目A的更新來到本地的upstream裏
git fetch upstream
切換到你自己想要merge的分支,這裏我用舉例:master
git checkout master
merge項目A的更新到你的branch
git merge upstream/master
結束
轉自:https://segmentfault.com/q/1010000005652705
補充:
https://www.cnblogs.com/softidea/p/4793254.html
https://help.github.com/en/articles/configuring-a-remote-for-a-fork