jQuery源码框架fn解读

(function( window, undefined ){
        var jQuery = (function(){
            var jQuery = function( selector, context ){
                return new jQuery.fn.init( selector, context )
            }
            
            jQuery.fn = jQuery.prototype = {
                constructor: jQuery,
                init: function( selector, context ){
                    if (!selector) return this;
                    var nodeList = (context || document).querySelectorAll( selector ),
                        i = 0,
                        length = nodeList.length;
                    for (; i(function( window, undefined ){
        var