classlist add jquery code example

Example 1: addclass jquery

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

Example 2: add class jquery

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

Example 3: how to add class on the base of has class in jquery

$( "ul li" ).addClass(function( index ) {
  return "item-" + index;
});