JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/themes/ui-lightness/jquery-ui.css">
<em>text </em>
<em>text </em>
<em>text </em>
<em>text </em>
<em>text </em>

JavaScript

var $ems = $('em');

var colors = ['red','green','blue','orange','purple'];

setInterval(function() {
    $ems.each(function() {
        var number = ~~(Math.random() * 5);
        $(this).animate({color: colors[number]}, 500);
    });
},500);