如何生成唯一的ID与node.js

function generate(count) {
    var founded = false,
        _sym = 'abcdefghijklmnopqrstuvwxyz1234567890',
        str = '';
    while(!founded) {
        for(var i = 0; i < count; i++) {
            str += _sym[parseInt(Math.random() * (_sym.length))];
        }
        base.getID(string, function(err, res) {
            if(!res.length) {
                founded = true; // How to do it?
            }
        });
    }
    return str;
}

如何设置一个变量值与数据库查询回调?我该怎么做呢?

当前回答

节点uuid已弃用，请使用uuid

npm install uuid --save
// Generate a v1 UUID (time-based) 
const uuidV1 = require('uuid/v1');
uuidV1(); // -> '6c84fb90-12c4-11e1-840d-7b25c5ee775a' 

// Generate a v4 UUID (random) 
const uuidV4 = require('uuid/v4');
uuidV4(); // -> '110ec58a-a0f2-4ac4-8393-c866d813b8d1'

Npm链接

2017-01-18 15:18:16

其他回答

在Node中创建随机32字符字符串的最快方法是使用本地crypto模块:

const crypto = require("crypto");

const id = crypto.randomBytes(16).toString("hex");

console.log(id); // => f9b327e70bbcf42494ccb28b2d98e00e

2016-10-22 11:47:45

简单，基于时间，没有依赖:

(new Date()).getTime().toString(36)

Date.now().toString(36)

输出:jzlatihl

加上随机数(感谢@Yaroslav Gaponov的答案)

(new Date()).getTime().toString(36) + Math.random().toString(36).slice(2)

jzlavejjperpituute输出

2019-08-21 13:40:22

你可以使用urid包npm安装urid

import urid from 'urid';

urid(); // qRpky22nKJ4vkbFZ

阅读完整的文档:https://www.npmjs.com/package/urid

// Set the size
urid(8); //ZDJLC0Zq

// Use the character set
urid('num'); // 4629118294212196
urid('alpha'); // ebukmhyiagonmmbm
urid('alphanum'); // nh9glmi1ra83979b

// Use size with character set
urid(12, 'alpha'); // wwfkvpkevhbg

// use custom character set
urid(6, '0123456789ABCDEF'); // EC58F3
urid('0123456789ABCDEF'); // 6C11044E128FB44B

// some more samples
urid()               // t8BUFCUipSEU4Ink
urid(24)             // lHlr1pIzAUAOyn1soU8atLzJ
urid(8, 'num')       // 12509986
urid(8, 'alpha')     // ysapjylo
urid(8, 'alphanum')  // jxecf9ad

// example of all character sets
urid('num')          // 5722278852141945
urid('alpha')        // fzhjrnrkyxralgpl
urid('alphanum')     // l5o4kfnrhr2cj39w
urid('Alpha')        // iLFVgxzzUFqxzZmr
urid('ALPHA')        // ALGFUIJMZJILJCCI
urid('ALPHANUM')     // 8KZYKY6RJWZ89OWH
urid('hex')          // 330f726055e92c51
urid('HEX')          // B3679A52C69723B1

// custom character set
urid('ABCD-')        // ACA-B-DBADCD-DCA

2022-07-06 08:55:54

这里是目前解决方案的一个基准，参考纳米基准

import { v4 as uuid4 } from 'uuid'
import benchmark from 'benchmark'
import shortid from 'shortid'

let suite = new benchmark.Suite()

suite
  .add('crypto.randomUUID', () => {
    crypto.randomUUID()
  })
  .add('nanoid', () => {
    nanoid()
  })
  .add('uuid v4', () => {
    uuid4()
  })
  .add("math.random", () => {
    (new Date()).getTime().toString(36) + Math.random().toString(36).slice(2)
  })
  .add('crypto.randomBytes', () => {
    crypto.randomBytes(32).toString('hex')
  })
  .add('shortid', () => {
    shortid()
  })
  .on('cycle', event => {
    let name = event.target.name
    let hz = formatNumber(event.target.hz.toFixed(0)).padStart(10)

    process.stdout.write(`${name}${pico.bold(hz)}${pico.dim(' ops/sec')}\n`)
  })
  .run()

结果是

node ./test/benchmark.js
crypto.randomUUID         13,281,440 ops/sec
nanoid                     3,278,757 ops/sec
uuid v4                    1,117,140 ops/sec
math.random                1,206,105 ops/sec
crypto.randomBytes           280,199 ops/sec
shortid                       30,728 ops/sec

测试env:

2.6 GHz 6Cores Intel酷睿i7 MacOS 节点v16.17.0

2022-08-29 07:54:06

更容易，没有额外的模块

Math.random().toString(26).slice(2)

2017-09-21 20:02:42

如何生成唯一的ID与node.js

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