jQuery.fn.extend and jQuery.extend usage

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demo: jquery itself does not provide jQuery.color () This method, if we need the methods of the jQuery itself be extended, then we need is jQuery.fn.extend.

               return $(this).css("color");
              return $(this).css("color",val);

$(this).color("red");// On the jquery object color settings  
alert($(this).color());// Gets the color of the jquery object  , With a pop-up dialog box  

2.jQuery.extend expansion of the jQuery object, can be understood as a static method, no instance of jQuery, you can use

jQuery.extend( {

     return a+b;

Call: alert ($. Add (3, 4));
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