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

安装NPM uuid包(来源:https://github.com/uuidjs/uuid):

npm install uuid

并在你的代码中使用它，例如ES6导入:

import { v4 as uuidv4, v6 as uuidv6 } from 'uuid';

uuidv4();
uuidv6();

或者使用CommonJS需要:

const { 
  v1: uuidv1,
  v4: uuidv4,
} = require('uuid');

uuidv1(); // -> '6c84fb90-12c4-11e1-840d-7b25c5ee775a' 
uuidv4(); // -> '110ec58a-a0f2-4ac4-8393-c866d813b8d1'

For

2014-04-27 18:07:43

其他回答

这里的解决方案是旧的，现在已弃用:https://github.com/uuidjs/uuid#deep-requires-now-deprecated

用这个:

NPM安装uuid

//add these lines to your code
const { v4: uuidv4 } = require('uuid');
var your_uuid = uuidv4();
console.log(your_uuid);

2020-04-03 03:48:54

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

生成加密性强的伪随机数据。size参数是一个数字，表示要生成的字节数。

// Asynchronous
const {
  randomBytes,
} = require('crypto');

randomBytes(256, (err, buf) => {
  if (err) throw err;
  console.log(`${buf.length} bytes of random data: unique random ID ${buf.toString('hex')}`);
});

知道更多

2021-12-26 05:51:03

NPM中使用https://www.npmjs.com/package/uniqid