JavaScript生成UUID的五种方法详解

科技前沿 • 2025-02-20 09:22 • 阅读 74

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UUID的介绍参考文章: UUID简介以及java代码获取UUID示例_java 获取uuid_西晋的no1的博客-CSDN博客

简介

UUID(Universally Unique IDentifier) 全局唯一标识符。

UUID是一种由算法生成的二进制长度为128位的数字标识符。

UUID的格式为“xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx”，其中的 x 是 0-9 或 a-f

范围内的一个32位十六进制数。在理想情况下，任何计算机和计算机集群都不会生成两个相同的UUID。

1.第一种

function guid() { return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) { var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8); return v.toString(16); }); } console.log(guid())

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2.第二种

讯享网function uuid() { var s = []; var hexDigits = "0abcdef"; for (var i = 0; i < 36; i++) { s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1); } s[14] = "4"; // bits 12-15 of the time_hi_and_version field to 0010 s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01 s[8] = s[13] = s[18] = s[23] = "-"; var uuid = s.join(""); return uuid; } console.log(uuid())

3.第三种

function guid2() { function S4() { return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1); } return (S4() + S4() + "-" + S4() + "-" + S4() + "-" + S4() + "-" + S4() + S4() + S4()); } console.log(guid2())

4.第四种

讯享网// 指定长度和基数 function uuid2(len, radix) { var chars = '0ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split(''); var uuid = [], i; radix = radix || chars.length; if (len) { // Compact form for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random() * radix]; } else { // rfc4122, version 4 form var r; // rfc4122 requires these characters uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-'; uuid[14] = '4'; // Fill in random data. At i==19 set the high bits of clock sequence as // per rfc4122, sec. 4.1.5 for (i = 0; i < 36; i++) { if (!uuid[i]) { r = 0 | Math.random() * 16; uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r]; } } } return uuid.join(''); } console.log(uuid2(16, 16))

5.第五种

说明:生成32位UUID方法

function uuid() { var s = []; var hexDigits = "0abcdef"; for (var i = 0; i < 32; i++) { s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1); } s[14] = "4"; // bits 12-15 of the time_hi_and_version field to 0010 s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01 s[8] = s[13] = s[18] = s[23]; var uuid = s.join(""); return uuid; } console.log(uuid())