Question

how to remove all attributes from with js or jquery.
(I don’t know what is the attributes in the body, i want remove all them)

Answer 1

You can use the DOM Level 1 Core attributes property to access attributes as a list. As plain JS:

function removeAllAttrs(element) {
    for (var i= element.attributes.length; i-->0;)
        element.removeAttributeNode(element.attributes[i]);
}
removeAllAttrs(document.body);

Or dressed up in jQuery plugin clothes:

$.fn.removeAllAttrs= function() {
    return this.each(function() {
        $.each(this.attributes, function() {
            this.ownerElement.removeAttributeNode(this);
        });
    });
};

$('body').removeAllAttrs();