The only theory, the purpose of life is building a paradise on earth in the earth.
在分支有改动后，提交：
git commit -m "changeDev"
然后换到主线上：
git checkout master
换到主线后，看看在分支修改的内容已经没有了，这个时候再换到分支上：
git checkout dev
会出现 错误
error: Your local changes to the following files would be overwritten by checkout:
QianTuMei.xcworkspace/xcuserdata/weiyuxiang.xcuserdatad/UserInterfaceState.xcuserstate
Please commit your changes or stash them before you switch branches.
需要：
git add QianTuMei.xcworkspace/xcuserdata/weiyuxiang.xcuserdatad/UserInterfaceState.xcuserstate
然后再push上去:
git push origin dev
创建分支 : git branch xxx
查看当前主线：git branch ,前面带 * 为当前主线