59 lines
2.1 KiB
TypeScript
59 lines
2.1 KiB
TypeScript
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/**
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* UUID 生成器类
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* 提供静态方法生成符合 RFC4122 标准的 UUID
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*/
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export class UUIDGenerator {
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// 私有静态计数器
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private static counter = 0;
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/**
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* 获取递增计数器值
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*/
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private static getCounter(): number {
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this.counter = (this.counter + 1) % 0xffffff;
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return this.counter;
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}
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/**
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* 生成 UUID v4 (随机)
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* @returns 返回符合 RFC4122 标准的 UUID 字符串
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* @example
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* UUIDGenerator.generate() // => "123e4567-e89b-12d3-a456-426614174000"
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*/
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public static generate(): string {
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if (typeof crypto !== 'undefined' && crypto.getRandomValues) {
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const buffer = new Uint8Array(16);
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crypto.getRandomValues(buffer);
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buffer[6] = (buffer[6] & 0x0f) | 0x40;
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buffer[8] = (buffer[8] & 0x3f) | 0x80;
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return ([
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buffer.slice(0, 4).reduce((acc, val) => acc + ('00' + val.toString(16)).slice(-2), ''),
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buffer.slice(4, 6).reduce((acc, val) => acc + ('00' + val.toString(16)).slice(-2), ''),
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buffer.slice(6, 8).reduce((acc, val) => acc + ('00' + val.toString(16)).slice(-2), ''),
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buffer.slice(8, 10).reduce((acc, val) => acc + ('00' + val.toString(16)).slice(-2), ''),
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buffer.slice(10, 16).reduce((acc, val) => acc + ('00' + val.toString(16)).slice(-2), ''),
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]).join('-');
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}
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// 改进的后备方案
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const timestamp = Date.now();
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const count = this.getCounter();
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const random = Math.random() * 0xffffffff | 0;
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const time_low = timestamp & 0xffffffff;
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const time_mid = ((timestamp >>> 32) & 0xffff) ^ (count & 0xffff);
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const time_hi = 0x4000 | (random & 0x0fff);
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const clock_seq = 0x8000 | (random >>> 16 & 0x3fff);
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const node = random >>> 32;
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return (
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time_low.toString(16).padStart(8, '0') + '-' +
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time_mid.toString(16).padStart(4, '0') + '-' +
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time_hi.toString(16).padStart(4, '0') + '-' +
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clock_seq.toString(16).padStart(4, '0') + '-' +
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node.toString(16).padStart(12, '0')
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);
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}
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}
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