JSFiddle - React, Tailwind, and code Playground

by silverlight

HTML

<input type="button" value="Test" />
<br />

JavaScript

var obj = {};
function a(){
    obj['key2'] = 'valuke';
    alert(obj['key2']);
}
$(document).ready(function(){
    $('input').on('click',function(){
        a();
    });
});