Tryit Editor v2.7

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style>
.example {
    color: red;
    padding: 10px;
    width: 150px;
    font-size: 15px;
}
</style>

<script>
var _hmt = _hmt || [];
(function() {
var hm = document.createElement("script");
hm.src = "//hm.baidu.com/hm.js?73c27e26f610eb3c9f3feb0c75b03925";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
</head>
<body>

<p>Click the button to get the name of the button element's second attribute.</p>

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

<p>In this example, the name of the first attribute is "onclick", and the second is "class".</p>

<p><strong>Note:</strong> In Internet Explorer 8 and earlier, the attributes property will return a collection of all possible attributes for the element, and will, in this example, display the name of a different attribute.</p>

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

<script>
function myFunction() {
    var a = document.getElementsByTagName("BUTTON")[0];
    var x = a.attributes.item(1).name;  
    document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>