.addClass()
Adds the specified class(es) to each of the set of matched elements.
Category: Class Attribute
These methods inspect and manipulate the CSS classes assigned to elements.
.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 switch argument.