Four variations of jQuery ready() — what's the difference?

Question

I\'ve seen four different ways to tell jQuery to execute a function when the document is ready. Are these all equivalent?

$(document).ready(function () {
           


        

Answer 1

There is no difference.

$ is the same as jQuery. If you view the unminified source, you will see var $ = jQuery = ... or something to that effect.

The jQuery function checks the type of it's parameter, if it is a function, it treats it the same as $(document).ready(...)

Calling jQuery without a parameter defaults to using document. So $() and $(document) are identical. Try it in Firebug.