JSFiddle - React, Tailwind, and code Playground
HTML
<div id="mydiv">
<span id='span1'></span>
<span id='span2'></span>
</div>
JavaScript
var IDs = [];
$("#mydiv").find("span").each(function(){ IDs.push($(this).attr("id")); });
alert(IDs);
<div id="mydiv">
<span id='span1'></span>
<span id='span2'></span>
</div>
var IDs = [];
$("#mydiv").find("span").each(function(){ IDs.push($(this).attr("id")); });
alert(IDs);