Differences between jquery. fn. extend and jquery. extend, jquery. fn. extend

Differences between jquery. fn. extend and jquery. extend, jquery. fn. extend

1. jquery. extend (object); add a new method for the class to extend the jQuery class itself.
Jquery. fn. extend (object); add a method to the jQuery object.

$. Extend ({add: function (a, B) {return a + B ;}}); // $. add (3,4); // return 7

Add a "static method" for add in jQuery, and then you can use this method in the place where jQuery is introduced.

2. jQuery. fn. extend (object); the extension to jQuery. prototype is to add "member functions" to the jQuery class ". JQuery class instances can use this "member function ".

$. Fn. extend ({alertClick: function () {$ (this ). click (function () {alert ($ (this ). val () ;};}}); // The page is: <input id = "input1" type = "text"/> // use $ ("# input1 "). alertClick ();

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