js.js

let sliderElement = document.querySelector("#slider");
let buttonElement = document.querySelector("#button");

let sizePassword = document.querySelector("#valor");
let password =  document.querySelector("#password");

let containerPassword = document.querySelector("#container-password")

let charset = "abcdefghijklmnopqrstuvwyzABCDEFGHIJKLMNOPQQRSTUVWXYZ0123456789";
let novaSenha = "";

sizePassword.innerHTML = sliderElement.value;

slider.oninput = function(){
    sizePassword.innerHTML = this.value;
}

function generatePassword(){
    let pass = "";

    for(let i = 0, n = charset.length; i < sliderElement.value; ++i){
        pass += charset.charAt(Math.floor(Math.random() * n ));
    } 

    containerPassword.classList.remove("hide")
    password.innerHTML = pass;
    novaSenha = pass;

}