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What does the fn here mean?
jQuery.fn.jquery 
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The Fn key, short form for function, is a modifier key on many keyboards, especially on laptops, used in a compact layout to combine keys which are usually kept separate.
In jQuery, the $ sign is just an alias to jQuery() , then an alias for a function. This page reports: Basic syntax is: $(selector).action() A dollar sign to define jQuery.
It's just shorthand for $(document). ready() , as in: $(document). ready(function() { YOUR_CODE_HERE }); Sometimes you have to use it because your function is running before the DOM finishes loading.
fn. extend() method extends the jQuery prototype ( $. fn ) object to provide new methods that can be chained to the jQuery() function.
In jQuery, the fn property is just an alias to the prototype property.
The jQuery identifier (or $) is just a constructor function, and all instances created with it, inherit from the constructor's prototype.
A simple constructor function:
function Test() { this.a = 'a'; } Test.prototype.b = 'b'; var test = new Test(); test.a; // "a", own property test.b; // "b", inherited property A simple structure that resembles the architecture of jQuery:
(function() { var foo = function(arg) { // core constructor // ensure to use the `new` operator if (!(this instanceof foo)) return new foo(arg); // store an argument for this example this.myArg = arg; //.. }; // create `fn` alias to `prototype` property foo.fn = foo.prototype = { init: function () {/*...*/} //... }; // expose the library window.foo = foo; })(); // Extension: foo.fn.myPlugin = function () { alert(this.myArg); return this; // return `this` for chainability }; foo("bar").myPlugin(); // alerts "bar" If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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