UUID 生成器
生成一个或多个随机 v4 UUID，可直接复制。
完全在你的浏览器中运行，你输入的任何内容都不会上传。
About UUID v4
A version 4 UUID is a 128-bit identifier made from cryptographically secure random numbers. The chance of two colliding is so small that they are safe to use as database keys, file names and request IDs without coordination.