Jquery---$.fn---jQuery.fn.extend

(1) How to develop plug-ins:

Jquery.extend (object) is the extension of the jquery class itself, adding new methods to the class.

JQuery.fn.extend (object) Adds a method to a jquery object and adds a member function (Jquery.fn = jquery.prototype) to the jquery class.

(2) Specific wording: an extension of the notation is to call $.ab= ({}) when $.ab.add ()

$.extend ({

Sub:function (A, b) {returna-b;}

Add:function (A, b) {returna+b;}

});

$.fn.extend ({

Sub:function (A, b) {returna-b;}

      Add:function (A, b) {returna+b;}

});

$.add (2,5);

(3) $.extend can also be used to merge objects:

Obj1 = {name: "John", Location: {City: "Boston"}};

Obj2 = {Last: ' Resig ', location: {state: ' MA '}};

Jquery.extend (True,obj1, obj2);

Results:

{name: ' John ', Last: ' Resig ', location: ' {state: ' MA '}}

True indicates a deep copy, changing the value of the OBJ2 does not affect the value of obj1, and if a shallow copy is made, changing the object value in the OBJ2 causes the object value in the Obj1 to change.

Jquery---$.fn---jQuery.fn.extend