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Somar atributos

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boas malta

tenho aqui uma duvida

tenho um formulario com algumas checkbox e gostaria de somar as que estão selecionadas não pelo campo value mas por um attr

tem como fazer isso?

eu tenho assim e se for para value ele faz a conta certinha

$(".dias").change(function() {
var total = $('input[class="dias"]:checked').get().reduce(function(tot, el) {
return tot + Number(el.value);

  var novototal = total.toFixed(2); 
$('#resultado').html(novototal+" €");


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