Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.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>