问题

Instead of individually calling $(\"#item\").removeClass() for every single class an element might have, is there a single function which can be called which removes all CSS classes from the given element?

Both jQuery and raw JavaScript will work.

回答1:

$("#item").removeClass();

Calling removeClass with no parameters will remove all of the item's classes.

You can also use (but is not necessarily recommended, the correct way is the one above):

$("#item").removeAttr('class');
$("#item").attr('class', '');
$('#item')[0].className = '';

If you didn't have jQuery, then this would be pretty much your only option:

document.getElementById('item').className = '';

回答2:

Hang on, doesn't removeClass() default to removing all classes if nothing specific is specified? So

$("#item").removeClass();

will do it on its own...

回答3:

Just set the className attribute of the real DOM element to '' (nothing).

$('#item')[0].className = ''; // the real DOM element is at [0]

Edit: Other people have said that just calling removeClass works - I tested this with the Google JQuery Playground: http://savedbythegoog.appspot.com/?id=ag5zYXZlZGJ5dGhlZ29vZ3ISCxIJU2F2ZWRDb2RlGIS61gEM ... and it works. So you can also do it this way:

$("#item").removeClass();

回答4:

Of course.

$('#item')[0].className = '';
// or
document.getElementById('item').className = '';

回答5:

Heh, came searching for a similar answer. Then it hit me.

Remove Specific Classes

$('.class').removeClass('class');

Say if element has class="class another-class"

回答6:

The shortest method

$('#item').removeAttr('class').attr('class', '');

回答7:

You can just try

$(document).ready(function() {
   $('body').find('#item').removeClass();
});

If you have to access to that element without class name, for example you have to add a new class name, you can do that:

$(document).ready(function() {
   $('body').find('#item').removeClass().addClass('class-name');
});

I use that function in my projet to remove and add class in a html builder. Good luck.

回答8:

$('#elm').removeAttr('class');

no longer class attr wil be present in "elm".

回答9:

I like using native js do this, belive it or not!

1.

// remove all items all class  
const items = document.querySelectorAll('item');
for (let i = 0; i < items.length; i++) {
    items[i].className = '';
}

2.

// only remove all class of first item
const item1 = document.querySelector('item');
item1.className = '';

jQuery ways

1. $("#item").removeClass();

2. $("#item").removeClass("class1 ... classn");

回答10:

Since not all versions of jQuery are created equal, you may run into the same issue I did which means calling $("#item").removeClass(); does not actually remove the class. (Probably a bug)

A more reliable method is to simply use raw JavaScript and remove the class attribute altogether.

document.getElementById("item").removeAttribute("class");

回答11:

try with removeClass

For instance:

var nameClass=document.getElementsByClassName("clase1");
console.log("after", nameClass[0]);
$(".clase1").removeClass();
var nameClass=document.getElementsByClassName("clase1");
console.log("before", nameClass[0]);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="clase1">I am Div with class="clase1"</div>

回答12:

Let's use this example. Maybe you want the user of your website to know a field is valid or it needs attention by changing the background color of the field. If the user hits reset then your code should only reset the fields that have data and not bother to loop through every other field on your page.

This jQuery filter will remove the class "highlightCriteria" only for the input or select fields that have this class.

$form.find('input,select').filter(function () {
    if((!!this.value) && (!!this.name)) {
        $("#"+this.id).removeClass("highlightCriteria");
    }
});

回答13:

I had similar issue. In my case on disabled elements was applied that aspNetDisabled class and all disabled controls had wrong colors. So, I used jquery to remove this class on every element/control I wont and everything works and looks great now.

This is my code for removing aspNetDisabled class:

$(document).ready(function () {

    $("span").removeClass("aspNetDisabled");
    $("select").removeClass("aspNetDisabled");
    $("input").removeClass("aspNetDisabled");

}); 

来源：https://stackoverflow.com/questions/1424981/how-to-remove-all-css-classes-using-jquery-javascript