Tryit Editor v2.7

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p>Click the button find out if the button has an onclick attribute specified.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var btn = document.getElementsByTagName("BUTTON")[0];
    var x = btn.getAttributeNode("onclick").specified;
    document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>