JSFiddle - React, Tailwind, and code Playground
HTML
<ul>
<li><a href='#home'>home</a></li>
<li><a href='#services'>services</a></li>
<li><a href='#about'>about</a></li>
</ul>
CSS
.active{color:red;}
JavaScript
var url = "http://www.mysite.com/myaction/services/";
var str = url.substr(0, url.lastIndexOf('/'));
var nUrl = str.substr(str.lastIndexOf('/')+1);
$('ul li a:contains('+nUrl+')').addClass('active');