JSFiddle - React, Tailwind, and code Playground

HTML

<a class="page_navigation" href="#something">click</a>

JavaScript

//$("a#myLink").attr("href");
$('.page_navigation').click(function(e)
{
    e.preventDefault();
    var href = $(this).attr('href');
    var equalPosition = href.indexOf('#'); //Get the position of '#'
    var withouthash = href.substring(equalPosition + 1); 
    alert(withouthash);
});