Intro: Http://blog.csdn.net/javazw123/article/details/6218603$.fn refers to the jquery namespace, plus the methods and properties on the FN, which are valid for each jquery instance. such as extension $.fn.abc () then you can look like this: $ ("#div"). ABC (); Usually use the Extend method extension, see the API in detail.
$.FX refers to the special effects of jquery. If you use display, swipe, fade, animate, and so on. $.fx.off can turn off the animation, in fact, the results are displayed directly. I do not understand, but asked the next side of the people, I still do not understand, it is probably $.fn equivalent to a static method of Java, when using the direct call
$ (#id). ABC, but no use of FN, for example,
$.validnumber = function (input) {if (!input) {alert ("Verify object is empty"); return true; }
You can just $.validnumber it when you use it.
The difference between $.fn and $ in jquery
