How to remove class attribute from div?

Question

I am using JavaScript and I want to add/remove a Class attribute if a button is clicked. I am able to add the class, but I don\'t know how to remove it. how can I do that?

Answer 1

In the future-ish, you can also consider Element.classList.

   var d = document.getElementsByTagName('div')[0];
   d.classList; // []
   d.classList.add('foo'); // undefined
   d.classList; // ["foo"]
   d.classList.remove('foo'); // undefined
   d.classList; // []

I say future-ish b/c you have to consider this IE < 10.