如何从div中删除class属性？

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")应该可以工作。

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 = '';

Answer 3

function hasClass(ele,cls) {
    return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}
function addClass(ele,cls) {
    if (!this.hasClass(ele,cls)) ele.className += " "+cls;
}
function removeClass(ele,cls) {
    if (hasClass(ele,cls)) {
        var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
        ele.className=ele.className.replace(reg,' ');
    }
}

You can use RegExp in theses three functions to check class existance, add class, and remove class. Here is the source openjs

Answer 4

Simple:

box.removeAttribute('class'); 

See https://developer.mozilla.org/en/DOM/element.removeAttribute

Answer 5

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.

Answer 6

Try this :

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(){
               box.className=''
            }
       }

or double quotes box.className=""

Answer 7

For cross-browser support:

buttonCom.onclick = function() {
    box.className = ''; // IE
    box.removeAttribute('class'); // Others
};

Answer 8

您应该考虑使用jQuery，而不是使用它： $('.itemclass').removeClass('classname');