JSFiddle - React, Tailwind, and code Playground

HTML

<div><input type="text" name="kol[]" class="kolA tc" value="1" autocomplete="off"><div class="fav-pm"><span class="fav-m left">-</span><span class="fav-p right">+</span></div></div>

<input type="text" name="kol[]" class="kolA tc" value="1" autocomplete="off"><div class="fav-pm"><span class="fav-m left">-</span><span class="fav-p right">+</span></div>

CSS

.fav-m, .fav-p {
  width: 100px;
  height: 100px;
  background: #333;
  color: #fff;
  margin: 10px;
}

JavaScript

$(".fav-p").click(function(){
var i = $(this).parent().prev();
i.val(i.val() * 1 + 1);
});

$(".fav-m").click(function(){
var i = $(this).parent().prev();
i.val(i.val() * 1 - 1);
});