总结的一些封装好的javascript函数

平时总结的一些常用javascript函数封装：

 //获取样式
     function getStyle(obj,name){
         if(obj.currentStyle){
             return obj.currentStyle[name];
         }
         else{
             return getComputedStyle(obj,false)[name];
         }
     }

     //获取鼠标的位置
     function getPos(ev){
         var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
         var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
         return{x:ev.clientX+scrollLeft,y:ev.clientY+scrollTop}  //以一个json的形式返回

     }

     //通过className选择元素
     function getByClass(oParent,sClass){
         var aResult = [];
         var aEle = oParent.getElementsByTagName('*');
         for(var i=0; i<aEle.length; i++){
             if(aEle[i].className == sClass){
                 aResult.push(aEle[i]);
             }

         }
         return aResult;   //返回一个数组

     }

     //完美运动框架
     function startMove(obj,json,fnEnd){

         clearInterval(obj.timer);
         obj.timer=setInterval(function(){
             var bStop=true;  //这一次运动就结束了---所有值都已经到了
             for(var attr in json){///

                 //1.取当前的值
                 var cur = 0;
                 if(attr == 'opacity'){
                     cur = Math.round((parseFloat(getStyle(obj,attr)))*100);
                 }
                 else{
                     cur = parseInt(getStyle(obj,attr));
                 }

 //2.算速度
                 var speed = (json[attr]-cur)/6;
                 speed = speed>0?Math.ceil(speed):Math.floor(speed);

 //3.检测停止
                 if(cur != json[attr]){
                     bStop = false;
                 }
                 if(attr == 'opacity'){
                     obj.style.filter = 'alpha(opacity:'+(cur+speed)+')';
                     obj.style.opacity = (cur+speed)/100;
                 }else{
                     obj.style[attr] = cur + speed + 'px';
                 }
             }///

             if(bStop){
                 clearInterval(obj.timer);
                 if(fnEnd) fnEnd;
             }
         },30);
     }

     //事件绑定函数
     function myAddEvent(obj,ev,fn){
         if(obj.attachEvent){
             obj.attachEvent('on'+ev,fn);
         }
         else{
             obj.addEventListener(ev,fn,false);
         }
     }

     //全兼容的 事件绑定  and  阻止默认事件
     var EventUtil = {
 //Notice: type is not include 'on', for example: click mouseover mouseout and so on
         addHandler: function(element, type, handler){
             if (element.addEventListener){
                 element.addEventListener(type, handler, false);
             } else if(element.attachEvent){
                 element.attachEvent('on'+type, handler);
             } else {
                 element['on'+type] = handler;
             }
         },

         preventDefault: function(event){
             if(event.preventDefault){
                 event.preventDefault();
             }else{
                 event.returnValue = false;
             }
         }
     };

     //ajax函数
     function ajax(url,fnSucc,fnFaild){
 //1.创建Ajax对象
         if(window.XMLHttpRequest){
             var oAjax = new XMLHttpRequest();
         }
         else{
             var oAjax = new ActiveXObject("Microsoft.XMLHttp");

         }
 //2.连接服务器
         oAjax.open('GET',url,true);
 //3.发送请求
         oAjax.send();
 //4.接受返回值
         oAjax.onreadystatechange = function(){
             if(oAjax.readyState == 4){  //读取完成
                 if(oAjax.status == 200){  //成功
                     fnSucc(oAjax.responseText);
                 }
                 else{
                     if(fnFaild){     //传进来了才会用
                         fnFaild(oAjax.status);
                     }
                 }
             }
         };
     }