how to add css class in jquery code example

Example 1: jquery add class

if ($( "#foo" ).hasClass('className')) {
	$( "#foo" ).removeClass( 'className');
} else {
  $( "#foo" ).addClass( 'className');
}

Example 2: addclass jquery

$( "p" ).addClass( "myClass yourClass" );

Example 3: add class jquery

$("#my_id").attr("class", "my_new_class_name");