Front-End Engineers-jquery-understand $.extend (), $.fn.extend (), $.fn,

The following is their own understanding, welcome to learn from the small partners to correct, thank you thank you

1.jquery.fn.extend (object): Commonly used to make plugins

Official explanation: A jquery plugin is simply a new method, which we use to extend JQuery ' s prototype object. (A new simple jquery plugin that we used to extend the jquery prototype object)

As soon as you see the extended prototype object, it's clear that you're adding a method to the jquery prototype, and the resulting jquery instance can be used in this way through the rules of the prototype chain.

<Script>        $(function() {$.fn.extend ({min:function(A, b) {returna<b?a:b; }, Max:function(A, b) {returna>b?a:b;            }            }); Console.log ($.min (1, 2)); //Error: $.min is not a functionConsole.log ($ ("P"). Min (1, 2)); //1        }); </Script>        

2.jquery.extend (object)

Official explanation: Extend the jquery object itself. Used to add new functions to the jquery namespace.

Extension object itself, then the instance is not found for these methods

<Script>        $(function() {$.extend ({min:function(A, b) {returna<b?a:b; }, Max:function(A, b) {returna>b?a:b;            }            }); Console.log ($.min (1, 2)); //1Console.log ($ ("P"). Min (1, 2)); //Error: $ (...). Min is not a function }); 

3. Jquery.fn (object)

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Http://caibaojian.com/jquery-extend-and-jquery-fn-extend.html

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Jquery.fn = Jquery.prototype = {Init:function (selector, context) {//....//...};
So the extension of the method, to write in the extend inside, not to change the prototype, a big thing

Front-End Engineers-jquery-understand $.extend (), $.fn.extend (), $.fn,