JSFiddle - React, Tailwind, and code Playground
HTML
<h1>Test this in IE7 & IE8</h1>
<br>
<div>div1</div>
<div>div2</div>JavaScript
console.log($("div").eq());
console.log($("div").eq(undefined));
console.log($("div").eq(0));
console.log($("div").eq(null));