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更新 “检出标签段落”
依据英文版,更新该段落
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book/02-git-basics/sections/tagging.asc

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@@ -230,13 +230,35 @@ To /[email protected]:schacon/simplegit.git
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==== 检出标签
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在 Git 中你并不能真的检出一个标签,因为它们并不能像分支一样来回移动。
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如果你想要工作目录与仓库中特定的标签版本完全一样,可以使用 `git checkout -b [branchname] [tagname]` 在特定的标签上创建一个新分支:
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如果你想查看某个标签所指向的文件版本,可以使用 `git checkout` 命令,虽然说这会使你的仓库处于“detacthed HEAD”状态——这个状态有些不好的副作用:
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[source,console]
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----
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$ git checkout 2.0.0
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Note: checking out '2.0.0'.
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You are in 'detached HEAD' state. You can look around, make experimental
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changes and commit them, and you can discard any commits you make in this
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state without impacting any branches by performing another checkout.
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If you want to create a new branch to retain commits you create, you may
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do so (now or later) by using -b with the checkout command again. Example:
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git checkout -b <new-branch>
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HEAD is now at 99ada87... Merge pull request #89 from schacon/appendix-final
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$ git checkout 2.0-beta-0.1
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Previous HEAD position was 99ada87... Merge pull request #89 from schacon/appendix-final
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HEAD is now at df3f601... add atlas.json and cover image
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----
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在“detached HEAD”状态下,如果你做了些更改然后提交它们,标签不会发生变化,但你的新提交将不属于任何分支,并且将无法访问,除非确切的提交哈希。因此,如果您需要进行更改——比如说你正在修复旧版本的错误——你通常需要创建一个新分支:
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[source,console]
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$ git checkout -b version2 v2.0.0
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Switched to a new branch 'version2'
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当然,如果在这之后又进行了一次提交,`version2` 分支会因为改动向前移动了,那么 `version2` 分支就会和 `v2.0.0` 标签稍微有些不同,这时就应该当心了。
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当然,如果在这之后又进行了一次提交,`version2` 分支会因为这个改动向前移动了,`version2` 分支就会和 `v2.0.0` 标签稍微有些不同,这时就应该当心了。

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