【1】添加远程仓库
git remote add remote [仓库地址]
【2】拉取远程仓库
git pull remote
【3】切换分支
git checkout newbranch
创建并切换分支
git checkout -b newbranch
【4】合并
git merge remote/newbranch
【5】推送到fork仓库
fork仓库不含新分支 git push origin newbranch
fork仓库含有新分支 git push origin newbranch:newbranch