JSFiddle - React, Tailwind, and code Playground
HTML
<ul id="menu">
<li id=1><a href="http://google.com">Link</a>
</li>
<li id=2><a href="http://http://stackoverflow.com/">Link</a>
</li>
</ul>
JavaScript
for (var i = 1; i < 3; i++) {
var element = document.getElementById(i);
var liLink = document.getElementById(i).childNodes[0];
alert(liLink.href);
}