A couple of functions to generate simple passwords. Beware that this is based on Math.random() - it is not cryptographically secure

PW.js

var PW = (function () {

    "use strict";

    var sym = "!£$%^&*()-_=+[{]};:@#~,<.>/?\\|";
    var getRand = (n) => Math.floor(Math.random() * n);

    var basic = ()  => (
        btoa(getRand(Date.now()))
            .replace(/=+$/, "")
            .split("")
            .reverse()
            .join("")
            .slice(0, -2)
    );

    var strong = function () {

        var pw = basic().split("");
        var times = getRand(pw.length);
    
        while (times) {
    
            times -= 1;
    
            if (Math.random() < 0.5) {
                pw[getRand(pw.length)] = sym[getRand(sym.length)];
            }
            
        }
    
        return pw.join("");
        
    };

    return {
        basic,
        strong
    }
        
}());