JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main"> 
 <div id="child1" class="child"> 

</div>
 <div id="child2" class="child"> 

</div>
 <div id="child3" class="child"> 

</div>
</div>

JavaScript

$.each($("#main .child"),function()
{
   alert($(this).attr('id'));
});