JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<a class="btn btn-primary" id="randomize">
  Click me
</a>

<div id="question">
</div>

JavaScript

$(document).ready(function() {
var sources = new Array()

    sources[0] = 'url0'
    sources[1] = 'url1'
    sources[2] = 'url2'
    sources[3] = 'url3'

    var p = sources.length;
    $('#randomize').click(function() {
        var randomSource = Math.round(Math.random()*(p-1));
        $("#question").text("URL value is now: " + sources[randomSource]);
        $('#question').attr('src', sources[randomSource]);
    });
});