$.extend
extend function is used to extend jQuery object. We can use it to do extend normal object, jQuery utility and jQuery method.
jQuery.extend = jQuery.fn.extend = function() { } var x = {}; $.extend( x, {"name": "fred" }); alert(x.name); //fred $.extend({"xxx": "fred" }); alert($.xxx); //fred $.fn.extend( {"yyy": "jeff" }); alert($().yyy); //jeff