javascript - 如何使用 node.js 生成唯一 ID

Question

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;
}

如何使用数据库查询回调设置变量值？我该怎么做？

Answer 1

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

npm install uuid

并在您的代码中使用它，例如使用 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' 

对于