* @desc ʵ���� filter �� not ͬ�ȵĹ��ܣ�Ŀǰֻ�� .not(selector) �� .filter(selector) ���е��� * @param elements ��������Ԫ�ؼ� * @param qualifier {selector|function|element|jQueryObject} * @param keep {boolean} ���� qualifier �������Ƿ��� * @return {*}
( elements, qualifier, keep )
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