<!DOCTYPE html>
<html>
<head>
<script src="/lib/jquery-1.12.2.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
alert($("#w3s").attr("href"));
});
});
</script>
</head>
<body>
<p><a href="../index.html" id="w3s">W3Schools.com</a></p>
<button>Show href Value</button>
</body>
</html>