JSFiddle - React, Tailwind, and code Playground

HTML

<div>fdsafdsa</div> 
<div>fdsafdsa</div>
<div>fdsafdsa</div>
<div>fdsafdas</div> 
<div>dsafdsaf</div>
<div>safdsafd</div>
<div>dsafdsafdsafdf</div> 
<div>fdsafdsafsa</div>
<div>safdsafdd</div>
<div>fdsafsa</div> 
<div>afdsads</div>
<div>dsafdsaf</div>
<div>dsafdsafdsaf</div>

JavaScript

$("div").each(function(index) {
    if(index > 3)
    {
        
        if(index%2 == 0)
        {
            $(this).css("color","red");
        }
        alert("index = " + index + ". index / 2 = " + index%2);
    }
});