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?

    }

}