JSFiddle - React, Tailwind, and code Playground

HTML

<img src="https://www.tauber.at/wp-content/themes/argent/images/minus.png" class='MIN'><input class='InputText' value='0'><button class='PLUS'>+</button>

JavaScript

$(".PLUS, .MIN").click(function(){
   var itemVal = parseInt($(this).siblings(".InputText").val());
   if ($(this).hasClass('MIN'))
        itemVal--;      
   else
        itemVal++;
   $(this).siblings(".InputText").val(itemVal);
});