关于git checkout版本

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andy@AndyMacBookPro:/usr/local/webdata/andy/js/jquery$ git checkout 1.8.3Note: checking out '1.8.3'.You are in 'detached HEAD' state. You can look around, make experimentalchanges and commit them, and you can discard any commits you make in thisstate without impacting any branches by performing another checkout.If you want to create a new branch to retain commits you create, you maydo so (now or later) by using -b with the checkout command again. Example:  git checkout -b new_branch_nameHEAD is now at 869704b... Include distribution in release tag

然后我看到有一大堆输出，以为错了，就没有细看，直接使用了这个命令：

andy@AndyMacBookPro:/usr/local/webdata/andy/js/jquery$ git checkout -b 2.1.1Switched to a new branch '2.1.1'andy@AndyMacBookPro:/usr/local/webdata/andy/js/jquery$ git branch -a  1.2.6  1.3  1.8.0* 2.1.1  master  remotes/origin/1.11-stable  remotes/origin/1.x-master  remotes/origin/2.1-stable  remotes/origin/HEAD -> origin/master  remotes/origin/compat  remotes/origin/master  remotes/origin/standard-then  remotes/origin/standard-then-tests  remotes/origin/standard-then-tests-fixedandy@AndyMacBookPro:/usr/local/webdata/andy/js/jquery$

然后结果就是上面这样了，当然，我现在知道问题在哪里了。。。哈哈，git checkout 1.2.6，就是将版本切换到1.2.6这个Tag，我们可以看下jquery的tag：

andy@AndyMacBookPro:/usr/local/webdata/andy/js/jquery$ git tag1.01.0.11.0.21.0.31.0.41.0a1.11.1.11.1.21.1.31.1.3.11.1.3a1.1.41.10.01.10.0-beta11.10.11.10.21.11.01.11.0-beta11.11.0-beta21.11.0-beta31.11.0-rc11.11.11.11.1-beta11.11.1-rc11.11.1-rc21.11.21.1a1.1b1.21.2.11.2.21.2.2b1.2.2b21.2.31.2.3a1.2.3b1.2.41.2.4a1.2.4b1.2.51.2.61.31.3.01.3.11.3.1rc11.3.21.3b11.3b21.3rc11.41.4.01.4.11.4.21.4.31.4.3rc11.4.3rc21.4.41.4.4rc11.4.4rc21.4.4rc31.4a11.4a21.4rc11.51.5.01.5.11.5.1rc11.5.21.5.2rc11.5b11.5rc11.61.6.01.6.11.6.1rc11.6.21.6.2rc11.6.31.6.3rc11.6.41.6.4rc11.6b11.6rc11.71.7.01.7.11.7.1rc11.7.21.7.2b11.7.2rc11.7b11.7b21.7rc11.7rc21.8.01.8.11.8.21.8.31.8.3+11.8b11.8b21.8rc11.9.01.9.0b11.9.0rc11.9.12.0.02.0.0-beta32.0.0b12.0.0b22.0.12.0.22.0.32.1.02.1.0-beta12.1.0-beta22.1.0-beta32.1.0-rc12.1.12.1.1-beta12.1.1-rc12.1.1-rc22.1.22.1.3andy@AndyMacBookPro:/usr/local/webdata/andy/js/jquery$

其中git checkout可以切换到version，也可以切换到tag。

而那个git checkout -b，是指在本地创建分支。。。我傻乎乎的去创建了分支，结果git branch -a，就看到了本地有这么多版本。

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