jQuery Kits
Note the variable elems:
let elems = $('.www');
It will store a group of selected elements, the so-called set of jQuery elements.
You can change all elements of a jQuery set at once. Unlike querySelectorAll no loops are required.
In principle, the variable elems is most often not needed, since jQuery allows you to apply useful functions directly to the set, in the form of methods.
For example, this is how we get all elements with the class www and set them to red:
$('.www').css('color', 'red');
Almost all jQuery methods return the collection to which the method was applied, allowing you to chain methods of any length.
Let's get all elements with class www, give them red color, and change their text to 'newtext':
$('.www').css('color', 'red').html('new text');
