Tryit Editor v2.7

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style>
.mystyle {
    width: 300px;
    height: 100px;
    background-color: coral;
    color: white;
    margin-bottom: 10px;
}
</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 display the value of the class attribute of the div element below.</p>

<div id="myDIV" class="mystyle">
I am a DIV element with class="mystyle"
</div>

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

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

<script>
function myFunction() {
    var x = document.getElementsByClassName("mystyle")[0].className;
    var y = document.getElementById("myDIV").className;
    document.getElementById("demo").innerHTML = "Using getElementsByClassName: " + x + "<br>" + "Using getElementById: " + y;
}
</script>

</body>
</html>