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请教CSDN 的 ID 是怎么生成的

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Release： 2016-06-13 12:34:02
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请问CSDN 的 ID 是如何生成的？
当使用第三方登录时会生成一个 CSDN ID：u012365644

请教该ID是如何生成的？ 绝对唯一吗？

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