Getting Started with jQuery
Working with the jQuery library is done using the universal function $, which for brevity consists of just one character.
After the dollar, you should write parentheses (this is a function), in which the parameters are indicated (usually one parameter), something like this: $(parameter).
Most often, using the dollar $, you get a group of HTML elements by CSS selector.
Let's get all elements with class www:
let elems = $('.www');
Now we'll get only paragraphs with class p.www:
let elems = $('p.www');
Now we get an element with id equal to www:
let elems = $('#www');
As you can see, regular CSS selectors are used, similar to the querySelectorAll method. Only querySelectorAll appeared much later than jQuery, and has fewer capabilities (but works faster).
