两个相同的命令在git中产生不同的响应

Question

我现在正在学习git，我刚刚遇到了一个令人困惑的问题:我使用了两个相同的命令系列，但结果显示不同。第一系列命令是：

lihangdeMacBook-Pro:learngit lihang$ git checkout -b dev

Switched to a new branch 'dev'

lihangdeMacBook-Pro:learngit lihang$ emacs readme.txt     //doing some editing 

lihangdeMacBook-Pro:learngit lihang$ git add readme.txt

lihangdeMacBook-Pro:learngit lihang$ git commit -m "branch test"

[dev 01d10cf] branch test

 1 file changed, 1 insertion(+)

lihangdeMacBook-Pro:learngit lihang$ git checkout master

Switched to branch 'master'

Your branch is up-to-date with 'origin/master'.

这里的最后一句话显示“您的分支是‘sentence /master’的最新版本”。然后我删除了dev分支，并启动了一个名为feature 1的新分支：

lihangdeMacBook-Pro:learngit lihang$ git checkout -b feature1

Switched to a new branch 'feature1'

lihangdeMacBook-Pro:learngit lihang$ emacs readme.txt      //doing some editing

lihangdeMacBook-Pro:learngit lihang$ git add readme.txt

lihangdeMacBook-Pro:learngit lihang$ git commit -m "AND simple"

[feature1 4ad475a] AND simple

 1 file changed, 1 insertion(+), 1 deletion(-)

lihangdeMacBook-Pro:learngit lihang$ git checkout master

Switched to branch 'master'
Your branch is ahead of 'origin/master' by 1 commit.
  (use "git push" to publish your local commits)

这两个命令系列是相同的，但为什么两个命令的最后一句话显示不同的结果？

Answer 1

每条语句末尾的输出行Your branch is与您显示的命令无关(它只是为您提供关于刚刚切换到的分支的状态的上下文)。它所暗示的是，在第二组命令之前，您做了一些更新master的操作，但是您没有将这些更改推送到origin。