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有没有什么生成随机不重复的唯一 ID 且足够短的好办法？
source link: https://www.v2ex.com/t/715424
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问与答 - @kaiki - B 站的 bv 号那种就感觉可以，但是太长，我想生成只有几位的数字+大小写字母组合的随机字符表作为 ID，但是怕万一随机出以前出过的 ID
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