本篇jQuery将讲解100行代码以内实现一个你可以工作中扩展的jquery，跟着这篇文章一起动手操作一下吧。

;(function(window,factory){

    factory(window);

})(window,function(window){

    var jQuery=(function(){

        var jQuery=function(selector){

            return new jQuery.fn.init(selector);

        };

        jQuery.fn=jQuery.prototype={};

        var init=jQuery.fn.init=function(selector){

            if(!selector){

                return this;

            }

            if(typeof selector === "string"){

                if(selector.indexOf('<')!=-1){

                    this.ele = selector;                        

                }else{

                    //选择器

                    this.eles = document.querySelectorAll(selector);

                    var len = this.eles.length;

                    for(var i = 0;i<len;i++){

                        [].push.call(this,this.eles[i]);

                    }

                }                    

            }else if(typeof selector === "function" ){

                this.ready(selector);

            }else if(typeof selector === "object"){

                    return this;

            }

            return this;

        };

        init.prototype=jQuery.fn;

        jQuery.extend=jQuery.fn.extend=function(){

            var options, name, src, copy, copyIsArray, clone,

                    target = arguments[0] || {},

                    i = 1,

                    length = arguments.length,

                    deep = false;

                if (typeof target === "boolean") {

                    deep = target;

                    target = arguments[1] || {};

                    i = 2;

                }

                if (typeof target !== "object" && !jQuery.isFunction(target)) {

                    target = {};

                }

                if (i === length) {

                    target = this;

                    i--;

                }

                for ( ; i < length; i++) {

                    if ((options = arguments[ i ]) != null){

                        for(name in options){

                            src=target[name];

                            copy=options[name];

                            if(target===copy){

                                continue;

                            }

                            if(deep&©&&(jQuery.isPlainObject(copy)||(copyIsArray=jQuery.isArray(copy)))){

                                if(copyIsArray){

                                    copyIsArray=false;

                                    clone=src&&jQuery.isArray(src)?src:{};

                                }else{

                                    clone=src&&jQuery.extend(deep,clone,copy);

                                }

                                target[name]=jQuery.extend(deep,clone,copy);

                            }else if(copy!==undefined){

                                target[name]=copy;

                            }

                        }

                    }

                }

                return target;

        };

        jQuery.fn.extend({

            css:function(name,value){

                for(var i = 0;i<this.length;i++){

                    this[i].style[name] = value;

                }

                return this;

            },

            appendTo:function(context){

                    var parentNode = document.querySelector(context).parentNode;

                    parentNode.insertAdjacentHTML('afterBegin',this.ele);

            },

            ready:function(fn){

                document.addEventListener('DOMContentLoaded',fn,false);

            }

        });

        return jQuery;

    })();

    window.jQuery=window.$=jQuery;

    return jQuery;

});

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