JSFiddle - React, Tailwind, and code Playground

HTML

<div id="maFen" align="center";>
         <input name="monBouton3" id="monBouton3" type="button" onClick="$();"value="Ma Valeur X" />
       </div>

JavaScript

$('#monBouton3').click(function() {

i = 3;
$('#monBouton'+i).css({"background-color": "#c9fa17"}); 
var arg = "monBouton" + i;
alert (arg);
alert ($('#monBouton'+i).val());

});