Untitled

<!DOCTYPE html>
<html>

<head>
</head>

<body>
<p id='pas'>рррр</p>
<input class="www" value="1">
<input class="www" value="2">
<input class="www" value="3">

<button class="btn">Кликни сюда</button>
<script>
    let elem = document.querySelector('.btn');
    elem.addEventListener('bl', function() {
        let elems = document.querySelectorAll('.www'),

            www.addEventListener('blur', function() {
            this.value = Number(this.value) + 1;
            for (let { value } of elems)  ;
        });

    })
</script>
</body>

</html>