How to get class name through JavaScript

Here i am explaining how to get class name through JavaScript using id and u can also change class name.
How do get the class name through JavaScript given no id with this span.

Like: This is a simple span, here i am getting class name using id of span.

    var className=document.getElementById("xyz").className;
    if(className=="xyz")
    {
       alert(className);
    }
    else
    {
        document.write("This is not a valid class name");
        alert(className);
    }
Mukesh Jakhar - PHP Web Developer
Mukesh Jakhar

This is Mukesh Jakhar. I’m a professional web developer with 3+ years experience. I am always ready for freelance work and i am writing blogs in my free time. I love to learn new technologies and share with others.

I founded PHPKIDA in September 2015. The focus of this website to provide web development tutorials of PHP, WordPress, CodeIgniter, Jquery, MySQL, HMTL, CSS etc and sharing solution to problems which i already solved.

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