.addClass()
Adds the specified class(es) to each element in the set of matched elements.
Category: Class Attribute
.hasClass()
Determine whether any of the matched elements are assigned the given class.
.removeClass()
Remove a single class, multiple classes, or all classes from each element in the set of matched elements.
.toggleClass()
Add or remove one or more classes from each element in the set of matched elements, depending on either the class’s presence or the value of the state argument.