astroboy/plugins/astroboy-security/app/lib/randomString.js

Astroboy（阿童木）is a Nodejs SFB(Separation of Front and Back ends) framework, built on koa2.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const assert = require("assert");
const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
const length = Buffer.byteLength(chars);
/**
 * 生成一个长度为 len 的字符串
 * @param {Number} len 字符串长度
 */
function randomString(len = 10) {
    assert(typeof len === 'number' && len >= 0, 'the length of the random string must be a number!');
    var str = '';
    for (var i = 0; i < len; i++) {
        str += chars[Math.floor(length * Math.random())];
    }
    return str;
}
exports.randomString = randomString;
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