git checkout命令有很多種用法。

git checkout + 分支名，切換到指定的分支。

比如git checkout develop:

切換之后，HEAD文件的內容：

ref: refs/heads/develop

git checkout + 文件夾

丟棄工作區(qū)域中指定文件夾下面的修改：

git checkout + commit id

切換到指定的commit上去。

You are in ‘detached HEAD’ state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:

git checkout -b

HEAD is now at 7bda819fd fix: organization library should compile without core style library (#9637)

現(xiàn)在HEAD文件的內容：
7bda819fdf88bd171f63bcc155b8002b6d2a2a8e

更多Jerry的原創(chuàng)文章，盡在：“汪子熙”:

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總結

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