jQuery addClass example
Change class name on click in jQuery
HTML
<input id="one" type="number">
<input id="two" type="number">
<input id="three" type="number">
<button id="resultclick">го</button>
<div id="result" >Результат</div>
JavaScript
$("#resultclick").click(function() {
var one = parseInt($('#one').val());
var two = parseInt($('#two').val());
var three = parseInt($('#three').val());
var result = one + two + three;
console.log(result);
console.log(one);
console.log(two);
console.log(three);
$('#result').html(result);
});