zQuery的封裝有助于js初學(xué)者鞏固所學(xué)知識，發(fā)散思維，有助于更好的利用js代碼复旬；
在這里你會發(fā)現(xiàn)其實這個選擇器并不是那么難，很多基礎(chǔ)的函數(shù)都是原先封裝過的冲泥；
然后利用面向?qū)ο蟮姆绞骄园⒁粋€zQuery對象壁涎，然后把各種方法加載他的原型身上，然后再轉(zhuǎn)給$志秃；
在這里只是簡單的封裝了一些小方法怔球，事件和DOM，ajax浮还，jsonp的東西：
方法
css
attr
html
val
addClass
removeClass
show
hide
animate
index
eq
get
事件
onclick onmouseover onmouseout onmouseenter onmousemove onmouseup onmousedown onkeydown onkeyup oncontextmenu ondblclick onscroll onresize onload onerror onchange oninput onblur onfocus
DOM
$('<div></div>')
有興趣的可以進來看看竟坛，大家一起探討探討！

'use strict';
function ZQuery(arg){
    this.elements=[];
    this.domString='';
    switch(typeof arg){
        case 'string':
            //元素  獲取到
            if(arg.indexOf('<')!=-1){
                //存創(chuàng)建標(biāo)簽
                this.domString=arg;
            }else{
                this.elements=getEle(arg);
                this.length=this.elements.length;
            }
            break;
        case 'function':
            DOMReady(arg);
            break;
        default:
            this.elements.push(arg);
            break;
    }
}

//css================================================================================================================
ZQuery.prototype.css=function (name,value){
    if(arguments.length==2){
        for(var i=0; i<this.elements.length; i++){
            this.elements[i].style[name]=value;
        }
    }else{
        //{} 'width'
        if(typeof name=='string'){
            return getStyle(this.elements[0],name);
        }else{
            var json=name;
            for(var i=0; i<this.elements.length; i++){
                for(var name in json){
                    this.elements[i].style[name]=json[name];
                }
            }
        }
    }
    return this;
};

//attr
ZQuery.prototype.attr=function (name,value){
    if(arguments.length==2){
        for(var i=0; i<this.elements.length; i++){
            this.elements[i].setAttribute(name,value);
        }
    }else{
        //{} 'width'
        if(typeof name=='string'){
            return this.elements[0].getAttribute(name);
        }else{
            var json=name;
            for(var i=0; i<this.elements.length; i++){
                for(var name in json){
                    this.elements[i].setAttribute(name,json[name]);
                }
            }
        }
    }
    return this;
};

//html
ZQuery.prototype.html=function (str){
    if(str||str==''){
        for(var i=0; i<this.elements.length; i++){
            this.elements[i].innerHTML=str;
        }
    }else{
        return this.elements[0].innerHTML;
    }
    return this;
};

//val
ZQuery.prototype.val=function (str){
    if(str||str==''){
        for(var i=0; i<this.elements.length; i++){
            this.elements[i].value=str;
        }
    }else{
        return this.elements[0].value;
    }
    return this;
};

//addClass
ZQuery.prototype.addClass=function (sClass){
    for(var i=0; i<this.elements.length; i++){
        if(this.elements[i].className){
            var re=new RegExp('\\b'+sClass+'\\b','g');
            if(this.elements[i].className.search(re)==-1){
                this.elements[i].className+=' '+sClass;
            }
        }else{
            this.elements[i].className=sClass;
        }
        this.elements[i].className=this.elements[i].className.replace(/^\s+|\s+$/g,'').replace(/\s+/g,' ');
    }
    return this;
};

//removeClass
ZQuery.prototype.removeClass=function (sClass){
    for(var i=0; i<this.elements.length; i++){
        if(this.elements[i].className){
            var re=new RegExp('\\b'+sClass+'\\b','g');
            this.elements[i].className=this.elements[i].className.replace(re,'');
            this.elements[i].className=this.elements[i].className.replace(/^\s+|\s+$/g,'').replace(/\s+/g,' ');
            if(this.elements[i].className==''){
                this.elements[i].removeAttribute('class');
            }
        }
    }
    return this;
};

//show
ZQuery.prototype.show=function (){
    for(var i=0; i<this.elements.length; i++){
        this.elements[i].style.display='block';
    }
    return this;
};

//hide
ZQuery.prototype.hide=function (){
    for(var i=0; i<this.elements.length; i++){
        this.elements[i].style.display='none';
    }
    return this;
};

//animate
ZQuery.prototype.animate=function (json,options){
    for(var i=0; i<this.elements.length; i++){
        move(this.elements[i],json,options);
    }
    return this;
};

//eq
ZQuery.prototype.eq=function (n){
    return this.elements[n];
};

//index
ZQuery.prototype.index=function (){
    var aEle=this.elements[0].parentNode.children;
    for(var i=0; i<aEle.length; i++){
        if(aEle[i]==this.elements[0]){
            return i;
        }
    }
    return this;
};

//jq轉(zhuǎn)原生
ZQuery.prototype.get=function (n){
    return this.elements[n];
};

//事件
;'click mouseover mouseout mousedown mousemove mouseup mouseenter mouseleave keydown keyup contextmenu dblclick load error scroll resize'.replace(/\w+/g,function (str){
    ZQuery.prototype[str]=function (fn){
        for(var i=0; i<this.elements.length; i++){
            addEvent(this.elements[i],str,fn);
        }
    };
    return this;
});

//hover
ZQuery.prototype.hover=function (fn1,fn2){
    this.mouseenter(fn1);
    this.mouseleave(fn2);
    return this;
};

//toggle
ZQuery.prototype.toggle=function (){
    var arg=arguments;
    var _this=this;
    for(var i=0; i<this.elements.length; i++){
        (function (count){
            _this.elements[i].onclick=function (){
                arg[count%arg.length]();
                count++;
            };
        })(0);
    }
    return this;
};

//addEvent
function addEvent(obj,sEv,fn){
    if(obj.addEventListener){
        obj.addEventListener(sEv,function (ev){
            var oEvent=ev||event;
            if(fn(oEvent)==false){
                oEvent.preventDefault();
                oEvent.cancelBubble=true;
            }
        },false);
    }else{
        obj.attachEvent('on'+sEv,function (ev){
            var oEvent=ev||event;
            if(fn(oEvent)==false){
                oEvent.cancelBubble=true;
                return false;
            }
        });
    }
    return this;
}

//DOM插入
ZQuery.prototype.appendTo=function (str){
    var aParent=getEle(str);
    for(var i=0; i<aParent.length; i++){
        //不為人知DOM操作
        aParent[i].insertAdjacentHTML('beforeEnd',this.domString);
    }
    return this;
};
ZQuery.prototype.prependTo=function (str){
    var aParent=getEle(str);
    for(var i=0; i<aParent.length; i++){
        //不為人知DOM操作
        aParent[i].insertAdjacentHTML('afterBegin',this.domString);
    }
    return this;
};
ZQuery.prototype.insertAfter=function (str){
    var aParent=getEle(str);
    for(var i=0; i<aParent.length; i++){
        //不為人知DOM操作
        aParent[i].insertAdjacentHTML('afterEnd',this.domString);
    }
    return this;
};
ZQuery.prototype.insertBefore=function (str){
    var aParent=getEle(str);
    for(var i=0; i<aParent.length; i++){
        //不為人知DOM操作
        aParent[i].insertAdjacentHTML('beforeBegin',this.domString);
    }
    return this;
};

//remove
ZQuery.prototype.remove=function (){
    for(var i=0; i<this.elements.length; i++){
        this.elements[i].parentNode.removeChild(this.elements[i]);
    }
    return this;
};

//插件
$.fn=ZQuery.prototype;
$.fn.extend=function (json){
    for(var name in json){
        ZQuery.prototype[name]=json[name];
    }
};
$.ajax=function (json){
    ajax(json);
};

$.jsonp=function (json){
    jsonp(json);
};

function jsonp(json){
    var json=json||{};
    if(!json.url)return;
    json.cbName=json.cbName||'cb';
    json.data=json.data||{};
    json.data[json.cbName]='show'+Math.random();
    json.data[json.cbName]=json.data[json.cbName].replace('.','');
    var arr=[];
    for(var name in json.data){
        arr.push(name+'='+json.data[name]);
    }
    //a=1&b=2
    var str=arr.join('&');
    window[json.data[json.cbName]]=function (result){
        json.success&&json.success(result);
        oH.removeChild(oS);
    };
    var oH=document.head;
    var oS=document.createElement('script');
    oS.src=json.url+'?'+str;
    oH.appendChild(oS);
}

//ajax
function json2url(json){
    json.t=Math.random();
    var arr=[];
    for(var name in json){
        arr.push(name+'='+json[name]);
    }
    return arr.join('&');
}
function ajax(json){
    var json=json||{};
    if(!json.url)return;
    json.data=json.data||{};
    json.type=json.type||'get';
    if(window.XMLHttpRequest){
        var oAjax=new XMLHttpRequest();
    }else{
        var oAjax=new ActiveXObject('Microsoft.XMLHTTP');
    }
    switch(json.type.toLowerCase()){
        case 'get':
            oAjax.open('GET',json.url+'?'+json2url(json.data),true);
            oAjax.send();
            break;
        case 'post':
            oAjax.open('POST',json.url,true);
            oAjax.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
            oAjax.send(json2url(json.data));
            break;
    }
    oAjax.onreadystatechange=function (){
        if(oAjax.readyState==4){
            if(oAjax.status==200){
                json.success&&json.success(oAjax.responseText); 
            }else{
                json.error&&json.error(oAjax.status);
            }
        }
    };
}

//getStyle
function getStyle(obj,sName){
    return (obj.currentStyle||getComputedStyle(obj,false))[sName];
}
//move
function move(obj,json,options){
    var options=options||{};
    options.duration=options.duration||700;
    options.easing=options.easing||'ease-out';
    var start={};
    var dis={};
    for(var name in json){
        start[name]=parseFloat(getStyle(obj,name));
        dis[name]=json[name]-start[name];
    }
    var count=Math.floor(options.duration/30);
    var n=0;
    clearInterval(obj.timer);
    obj.timer=setInterval(function (){
        n++;
        for(var name in json){
            switch(options.easing){
                case 'linear':
                    var a=n/count;
                    var cur=start[name]+dis[name]*a;
                    break;
                case 'ease-in':
                    var a=n/count;
                    var cur=start[name]+dis[name]*Math.pow(a,3);
                    break;
                case 'ease-out':
                    var a=1-n/count;
                    var cur=start[name]+dis[name]*(1-Math.pow(a,3));
                    break;
            }
            if(name=='opacity'){
                obj.style.opacity=cur;
                obj.style.filter='alpha(opacity:'+cur*100+')';
            }else{
                obj.style[name]=cur+'px';
            }
        }
        
        if(n==count){
            clearInterval(obj.timer);
        }
    },16);
}

//DOMReady
function DOMReady(fn){
    if(document.addEventListener){
        document.addEventListener('DOMContentLoaded',function (){
            fn&&fn();
        },false);
    }else{
        document.attachEvent('onreadystatechange',function (){
            if(document.readyState=='complete'){
                fn&&fn();
            }
        });
    }
}

//把new ZQuery變成$
function $(arg){
    return new ZQuery(arg);
}

//選擇器
function getByClass(obj,sClass){
    if(obj.getElementsByClassName){
        return obj.getElementsByClassName(sClass);
    }
    var aResult=[];
    var aEle=obj.getElementsByTagName('*');
    var re=new RegExp('\\b'+sClass+'\\b','g');
    for(var i=0; i<aEle.length; i++){
        if(aEle[i].className.search(re)!=-1){
            aResult.push(aEle[i]);
        }
    }
    return aResult;
}

function getByStr(aParent,str){
    var aChild=[];
    for(var i=0; i<aParent.length; i++){
        switch(str.charAt(0)){
            case '#':
                var obj=document.getElementById(str.substring(1));
                aChild.push(obj);
                break;
            case '.':
                var aEle=getByClass(aParent[i],str.substring(1));
                for(var j=0; j<aEle.length; j++){
                    aChild.push(aEle[j]);
                }
                break;
            default:
                if(/^\w+\.\w+$/.test(str)){
                //li.on
                    var arr=str.split('.');
                    var aEle=aParent[i].getElementsByTagName(arr[0]);
                    var re=new RegExp('\\b'+arr[1]+'\\b','g');
                    for(var j=0; j<aEle.length; j++){
                        if(aEle[j].className.search(re)!=-1){
                            aChild.push(aEle[j]);
                        }
                    }
                }else if(/^\w+\[\w+\=\w+\]$/.test(str)){
                    //input[type=text]
                    var arr=str.split(/\[|\=|\]/g);
                    var aEle=aParent[i].getElementsByTagName(arr[0]);
                    for(var j=0; j<aEle.length; j++){
                        if(aEle[j].getAttribute(arr[1])==arr[2]){
                            aChild.push(aEle[j]);
                        }
                    }
                }else if(/^\w+\:\w+(\(\d+\))?$/.test(str)){
                    //li:first li:eq(0)
                    var arr=str.split(/\:|\(|\)/g);
                    var aEle=aParent[i].getElementsByTagName(arr[0]);
                    switch(arr[1]){
                        case 'first':
                            aChild.push(aEle[0]);
                            break;
                        case 'last':
                            aChild.push(aEle[aEle.length-1]);
                            break;
                        case 'even':
                            for(var j=0; j<aEle.length; j+=2){
                                aChild.push(aEle[j]);
                            }
                            break;
                        case 'odd':
                            for(var j=1; j<aEle.length; j+=2){
                                aChild.push(aEle[j]);
                            }
                            break;
                        case 'eq':
                            aChild.push(aEle[arr[2]]);
                            break;
                        case 'lt':
                            for(var j=0; j<arr[2]; j++){
                                aChild.push(aEle[j]);
                            }
                            break;
                        case 'gt':
                            for(var j=arr[2]; j<aEle.length; j++){
                                aChild.push(aEle[j]);
                            }
                            break;
                    }
                }else{
                    var aEle=aParent[i].getElementsByTagName(str);
                    for(var j=0; j<aEle.length; j++){
                        aChild.push(aEle[j]);
                    }
                }
                break;
        }
    }
    return aChild;
}

function getEle(str){
    var arr=str.replace(/^\s+|\s+$/g,'').split(/\s+/g);
    var aChild=[];
    var aParent=[document];
    
    for(var i=0; i<arr.length; i++){
        aChild=getByStr(aParent,arr[i]);
        aParent=aChild;
    }
    
    return aChild;
}