在javascript中生成具有要求的随机密码字符串 [英] Generate random password string with requirements in javascript

问题描述

我想生成一个随机字符串，它必须包含 5 个 a-z 字母和 3 个数字.

I want to generate a random string that has to have 5 letters from a-z and 3 numbers.

如何使用 JavaScript 执行此操作?

How can I do this with JavaScript?

我有以下脚本，但它不符合我的要求.

I've got the following script, but it doesn't meet my requirements.

        var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
        var string_length = 8;
        var randomstring = '';
        for (var i=0; i<string_length; i++) {
            var rnum = Math.floor(Math.random() * chars.length);
            randomstring += chars.substring(rnum,rnum+1);
        }

推荐答案

强制使用固定数量的字符是一个糟糕的想法.它不会提高密码的质量.更糟糕的是，它减少了可能的密码数量，因此通过暴力破解的黑客攻击变得更加容易.

Forcing a fixed number of characters is a bad idea. It doesn't improve the quality of the password. Worse, it reduces the number of possible passwords, so that hacking by bruteforcing becomes easier.

要生成由字母数字字符组成的随机单词，请使用:

To generate a random word consisting of alphanumeric characters, use:

var randomstring = Math.random().toString(36).slice(-8);

它是如何工作的?

Math.random()                        // Generate random number, eg: 0.123456
             .toString(36)           // Convert  to base-36 : "0.4fzyo82mvyr"
                          .slice(-8);// Cut off last 8 characters : "yo82mvyr"

Number.prototype 的文档.toString 和 string.prototype.slice 方法.

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