script.js

let sizePassword = document.querySelector('#valor')
let sliderElement = document.querySelector('#slider')
let buttonElement = document.querySelector('#button')

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

let charset = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789@'
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))
        console.log(pass)
    }
    containerPassword.classList.remove('hide')
    password.innerHTML = pass
    novaSenha = pass
}

function copyPassword(){
    alert('Senha copiada com sucesso')
    navigator.clipboard.writeText(novaSenha)
}