Calculate Number in ff

Calculate Number in ff

const btn = document.querySelector('.calculate');
btn.type =  'button';

let numbers = document.querySelectorAll('form [type="number"]');

numbers[numbers.length-1].closest('div').parentElement.insertAdjacentHTML('afterend',`<span class="calc"></span>`);
const resultEl = document.querySelector('.calc');
resultEl.style.display = 'none';



function sum(){
    let result = 0;
    numbers.forEach(function(num){
        result +=+ num.value; 
        resultEl.style.display = 'block';
        num.value = '';
        
        num.addEventListener('keyup', function(e){
            resultEl.style.display = 'none';
            //result += num.value;
        });
        
    });
    
    if(isNaN(result) === false){
        resultEl.innerHTML = `<b>Total:</b> ${result}`;
    }
}


btn.addEventListener('click', sum);