UUID 生成器
生成版本1、3、4、5、6和7的UUID。选择版本，配置选项并点击生成。所有处理均在浏览器中本地完成。
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UUID Versions Explained
| Version | Method | Use Case |
|---|---|---|
| v1 | Timestamp (100-ns) + random node | Time-ordered IDs; embeds creation time |
| v3 | MD5 hash of namespace + name | Deterministic ID from a name (e.g. DNS hostname) |
| v4 | Cryptographically random | General-purpose unique ID - most popular |
| v5 | SHA-1 hash of namespace + name | Like v3 but uses SHA-1 (recommended over v3) |
| v6 | Reordered v1 timestamp | Database-friendly sorting of time-based IDs |
| v7 | Unix ms timestamp + random | Modern time-based, monotonic, best for databases |