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);
                    }
                }
            }
        };
    }