No matter which type of selector we want to use in jQuery—be it CSS, XPath, or custom—we always start with the dollar sign and parentheses: $()
As mentioned in Chapter 1, the $() function removes the need to do a for loop to access a group of elements since whatever we put inside the parentheses will be looped through automatically and stored as a jQuery object. We can put just about anything inside the parentheses of the $() function. A few of the more common examples include:
A tag name: .
$('p')gets all paragraphs in the document.An ID: .
$('#some-id')gets the single element in the document that has the correspondingsome-idID.A class: .
$('.some-class')gets all elements in the document that have a class ofsome-class.