JSFiddle - React, Tailwind, and code Playground

HTML

<div class="my_list">
    <a href="#thumb_1">Thumb O1</a>
    <a href="#thumb_2">Thumb O2</a>
    <a href="#thumb_3">Thumb O3</a>
</div>

JavaScript

var my_var = 1;
$('.my_list a[href="#thumb_' + my_var + '"]').click(function(){
    alert("you click thumb"+ my_var);
});