JSFiddle - React, Tailwind, and code Playground

HTML

<div class="rating">
<a href="#" data-value="1" data-target="#numb">↑</a>
<a href="#" data-value="-1" data-target="#numb">↓</a>
<span id="numb">37</span>
</div>

CSS

a {text-decoration:none;}

JavaScript

$(function(){
    $(document.body).on('click', '[data-value][data-target]', function(){
        var target = $($(this).data('target'));
        target.text(+target.text() + $(this).data('value'));
    });
});