JS仿JQuery选择器功能

JQuery作为应用最广的JS库，其最强大的功能之一就是几乎涵盖所有方法的且代码十分简短的选择器功能，我们也可用自己的代码实现此功能，代码逻辑、使用方法与JQuery一致

function ZQuery(arg){
 this.elements = [];  //存东西
 this.domString = '';  //保存字符串标签
 if(typeof arg=='function'){
 //DOMReady
 DOMReady(arg);
 }else if(typeof arg=='string'||arg instanceof String){
 if(arg.indexOf('<')!=-1){
  this.domString = arg;
 }else{
  //获取元素
  this.elements = getEle(arg);
  this.length = this.elements.length;
 }
 }else{
 //原生对象-》ZQuery对象
 this.elements.push(arg);
 this.length = this.elements.length;
 }
}
ZQuery.prototype.css = function(name,value){
 if(arguments.length==2){
  //设置一个样式
  for(var i=0;i<this.elements.length;i++){
  this.elements[i].style[name] = value;
  }
 }else{
  if(typeof name=='string'){
  //获取样式
  return getStyle(this.elements[0],name);
  }else{
  //批量设置样式
  var json = name;
  for(var name in json){
   for(var i=0;i<this.elements.length;i++){
   this.elements[i].style[name] = json[name];
   }
  }
  }
 }
};
ZQuery.prototype.attr = function(name,value){
 if(arguments.length==2){
  //设置一个属性
  for(var i=0;i<this.elements.length;i++){
  this.elements[i].setAttribute(name,value);
  }
 }else{
  if(typeof name=='string'){
  //获取属性
  return this.elements[0].getAttribute(name);
  }else{
  //批量设置属性
  var json = name;
  for(var name in json){
   for(var i=0;i<this.elements.length;i++){
   this.elements[i].setAttribute(name,json[name]);
   }
  }
  }
 }
};
ZQuery.prototype.addClass = function(sClass){
 var re = new RegExp('\\b'+sClass+'\\b','g');
 for(var i=0;i<this.elements.length;i++){
 if(this.elements[i].className){
  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+$/g,'').replace(/\s+/g,' ');
 }
 return this;
};
ZQuery.prototype.removeClass = function(sClass){
 var re = new RegExp('\\b'+sClass+'\\b','g');
 for(var i=0;i<this.elements.length;i++){
 if(this.elements[i].className){
  this.elements[i].className = this.elements[i].className.replace(re,'');
  this.elements[i].className = this.elements[i].className.replace(/^\s+|\s+$/g,'').replace(/\s+/g,' ');
  if(this.elements[i].className==''){
  this.elements[i].removeAttribute('class');
  }
 }
 }
 return this;
};
ZQuery.prototype.html = function(value){
 if(value||value==''){
 //设置
 for(var i=0;i<this.elements.length;i++){
  this.elements[i].innerHTML = value;
 } 
 }else{
 return this.elements[0].innerHTML;
 }
};
ZQuery.prototype.val = function(value){
 if(value||value==''){
 //设置
 for(var i=0;i<this.elements.length;i++){
  this.elements[i].value = value;
 } 
 }else{
 return this.elements[0].value;
 }
};
ZQuery.prototype.show = function(){
 for(var i=0;i<this.elements.length;i++){
 this.elements[i].style.display = 'block';
 }
 return this;
};
ZQuery.prototype.hide = function(){
 for(var i=0;i<this.elements.length;i++){
 this.elements[i].style.display = 'none';
 }
 return this;
};
;'click mouseover mouseout mousedown mouseup mousemove mouseenter mouseleave change keydown keyup contextmenu'.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);
 }
 };
});
ZQuery.prototype.get = function(n){
 for(var i=0;i<this.elements.length;i++){
 if(i==n){
  return this.elements[i];
 }
 }
};
ZQuery.prototype.eq = function(n){
 for(var i=0;i<this.elements.length;i++){
 if(i==n){
  return $(this.elements[i]);
 }
 }
};
ZQuery.prototype.index = function(){
 var aSiblings = this.elements[0].parentNode.children;
 for(var i=0;i<aSiblings.length;i++){
 if(aSiblings[i]==this.elements[0]){
  return i;
 }
 }
};
ZQuery.prototype.hover = function(fn1,fn2){
 for(var i=0;i<this.elements.length;i++){
 $(this.elements[i]).mouseenter(fn1);
 $(this.elements[i]).mouseleave(fn2);
 }
};
ZQuery.prototype.toggle = function(){
 var args = arguments;
 var _this = this;
 for(var i=0;i<this.elements.length;i++){
 ;(function(count){
  $(_this.elements[i]).click(function(ev){
  args[count%args.length].call(this,ev);
  count++;
  });
 })(0);
 }
};
ZQuery.prototype.animate = function(json,options){
 for(var i=0;i<this.elements.length;i++){
 move(this.elements[i],json,options);
 }
};
ZQuery.prototype.appendTo = function(arg){
 var aParent = $(arg);
 for(var i=0;i<aParent.length;i++){
 aParent.get(i).insertAdjacentHTML('beforeEnd',this.domString);
 }
 return this;
};
ZQuery.prototype.prependTo = function(arg){
 var aParent = $(arg);
 for(var i=0;i<aParent.length;i++){
 aParent.get(i).insertAdjacentHTML('afterBegin',this.domString);
 }
 return this;
};
ZQuery.prototype.insertAfter = function(arg){
 var aParent = $(arg);
 for(var i=0;i<aParent.length;i++){
 aParent.get(i).insertAdjacentHTML('afterEnd',this.domString);
 }
 return this;
};
ZQuery.prototype.insertBefore = function(arg){
 var aParent = $(arg);
 for(var i=0;i<aParent.length;i++){
 aParent.get(i).insertAdjacentHTML('beforeBegin',this.domString);
 }
 return this;
};
ZQuery.prototype.remove = function(){
 var oParent = this.elements[0].parentNode;
 for(var i=0;i<this.elements.length;i++){
 oParent.removeChild(this.elements[i]);
 }
 return this;
};
function $(arg){
 return new ZQuery(arg);
};
$.ajax = function(json){
 ajax(json);
};
$.jsonp = function(json){
 jsonp(json);
};
$.fn = ZQuery.prototype;
$.fn.extend = function(json){
 for(var name in json){
 ZQuery.prototype[name] = json[name];
 }
};
function json2url(json){
 var arr = [];
 for(var name in json){
 arr.push(name+'='+encodeURIComponent(json[name]));
 }
 return arr.join('&');
}
function ajax(json){
 json = json||{};
 if(!json.url)return;
 json.type = json.type||'get';
 json.timeout = json.timeout||15000;
 json.data = json.data||{};
 json.data.t = Math.random();
 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;
 default:
  oAjax.open('GET',json.url+'?'+json2url(json.data),true);
  oAjax.send();
  break;
 }
 json.loading&&json.loading();
 json.timer = setTimeout(function(){
 oAjax.onreadystatechange = null;
 json.error&&json.error('网络超时。');
 },json.timeout);

 oAjax.onreadystatechange = function(){
 if(oAjax.readyState==4){
  clearTimeout(json.timer);
  if(oAjax.status>=200&&oAjax.status<300||oAjax.status==304){
  json.success&&json.success(oAjax.responseText);
  }else{
  json.error&&json.error(oAjax.status);
  }
 }
 };
}
function jsonp(json){
 json = json||{};
 if(!json.url)return;
 json.timeout = json.timeout||15000;
 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('.','');
 json.timer = setTimeout(function(){
 window[json.data[json.cbName]] = function(res){
  oHead.removeChild(oS);
  json.error&&json.error('网络超时!');
 }
 },json.timeout);
 window[json.data[json.cbName]] = function(res){
 clearTimeout(json.timer);
 oHead.removeChild(oS);
 json.success&&json.success(res);
 }
 var oHead = document.getElementsByTagName('head')[0];
 var oS = document.createElement('script');
 oS.src = json.url+'?'+jso