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?

window.onload = function(){
    var buttonGo = document.getElementsByTagName('button')[0];
    var buttonCom = document.getElementsByTagName('button')[1];
    var box = document.getElementById('box');
    buttonGo.onclick = function(){
        box.setAttribute('class','move');
    }
    buttonCom.onclick = function(){
        // how to remove class name?
    }
}

Answer 1

box.removeAttribute("class") should work.

Answer 2

The nicest way to set classes with Javascript is to use the className property:

// to add
box.className = 'move';
// to remove
box.className = '';