Why sometimes jQuery selector returns something like “a.fn.init”? [closed]

Answer 1

If you open Chrome's developer tools console for any given page and simply invoke $ you should see

$(selector, [startNode]) { [Command Line API] }

If you do the same thing on a page that has jQuery loaded, you'll see

function (a,b){return new n.fn.init(a,b)}

Evaluating $($0) is going to depend on the context of the page given the above information. You'll either get an element reference or a jQuery object.