JSFiddle - React, Tailwind, and code Playground

HTML

<div id='center'>
<div id='first'>1</div>
<div id='second'>2</div>
</div>

JavaScript

//pour les mettre dasn un array per exemple 
var touslesids=[];
$('#center').find('div').each( function(){
    touslesids.push($(this).attr('id') )
})

alert(touslesids)