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：
  1 //获取样式
  2     function getStyle(obj,name){
  3         if(obj.currentStyle){
  4             return obj.currentStyle[name];
  5         }
  6         else{
  7             return getComputedStyle(obj,false)[name];
  8         }
  9     }
 10 
 11     //获取鼠标的位置
 12     function getPos(ev){
 13         var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
 14         var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
 15         return{x:ev.clientX+scrollLeft,y:ev.clientY+scrollTop}  //以一个json的形式返回
 16 
 17     }
 18 
 19     //通过className选择元素
 20     function getByClass(oParent,sClass){
 21         var aResult = [];
 22         var aEle = oParent.getElementsByTagName('*');
 23         for(var i=0; i<aEle.length; i++){
 24             if(aEle[i].className == sClass){
 25                 aResult.push(aEle[i]);
 26             }
 27 
 28         }
 29         return aResult;   //返回一个数组
 30 
 31     }
 32 
 33     //完美运动框架
 34     function startMove(obj,json,fnEnd){
 35 
 36         clearInterval(obj.timer);
 37         obj.timer=setInterval(function(){
 38             var bStop=true;  //这一次运动就结束了---所有值都已经到了
 39             for(var attr in json){///
 40 
 41                 //1.取当前的值        
 42                 var cur = 0;
 43                 if(attr == 'opacity'){
 44                     cur = Math.round((parseFloat(getStyle(obj,attr)))*100);
 45                 }
 46                 else{
 47                     cur = parseInt(getStyle(obj,attr));
 48                 }
 49 
 50 //2.算速度
 51                 var speed = (json[attr]-cur)/6;
 52                 speed = speed>0?Math.ceil(speed):Math.floor(speed);
 53 
 54 //3.检测停止
 55                 if(cur != json[attr]){
 56                     bStop = false;
 57                 }
 58                 if(attr == 'opacity'){
 59                     obj.style.filter = 'alpha(opacity:'+(cur+speed)+')';
 60                     obj.style.opacity = (cur+speed)/100;
 61                 }else{
 62                     obj.style[attr] = cur + speed + 'px';
 63                 }
 64             }///
 65 
 66             if(bStop){
 67                 clearInterval(obj.timer);
 68                 if(fnEnd) fnEnd;
 69             }
 70         },30);
 71     }
 72 
 73     //事件绑定函数
 74     function myAddEvent(obj,ev,fn){
 75         if(obj.attachEvent){
 76             obj.attachEvent('on'+ev,fn);
 77         }
 78         else{
 79             obj.addEventListener(ev,fn,false);
 80         }
 81     }
 82 
 83     //全兼容的 事件绑定  and  阻止默认事件
 84     var EventUtil = {
 85 //Notice: type is not include 'on', for example: click mouseover mouseout and so on
 86         addHandler: function(element, type, handler){
 87             if (element.addEventListener){
 88                 element.addEventListener(type, handler, false);
 89             } else if(element.attachEvent){
 90                 element.attachEvent('on'+type, handler);
 91             } else {
 92                 element['on'+type] = handler;
 93             }
 94         },
 95 
 96         preventDefault: function(event){
 97             if(event.preventDefault){
 98                 event.preventDefault();
 99             }else{
100                 event.returnValue = false;
101             }
102         }
103     };
104 
105     //ajax函数
106     function ajax(url,fnSucc,fnFaild){
107 //1.创建Ajax对象
108         if(window.XMLHttpRequest){
109             var oAjax = new XMLHttpRequest();
110         }
111         else{
112             var oAjax = new ActiveXObject("Microsoft.XMLHttp");
113 
114         }
115 //2.连接服务器
116         oAjax.open('GET',url,true);
117 //3.发送请求
118         oAjax.send();
119 //4.接受返回值
120         oAjax.onreadystatechange = function(){
121             if(oAjax.readyState == 4){  //读取完成
122                 if(oAjax.status == 200){  //成功
123                     fnSucc(oAjax.responseText);
124                 }
125                 else{
126                     if(fnFaild){     //传进来了才会用
127                         fnFaild(oAjax.status);
128                     }
129                 }
130             }
131         };
132     }