JSFiddle - React, Tailwind, and code Playground
HTML
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/ui-lightness/jquery-ui.css">
<a id="Anchor"class="myAnchor" href="Myproject/Mypage.aspx?myTag=asp">Go</a>
JavaScript
var myTag = document.getElementById('Anchor').search.split('=')[1];
alert(myTag);