//获取元素的样式值。

function getStyle(elem,name){

    if(elem.style[name]){

        return elem.style[name];

        }else if(elem.currentStyle){

            return elem.currentStyle[name];

            }else if(document.defaultView&&document.defaultView.getComputedStyle){

                name=name.replace(/([A-Z])/g,”-$1″);

                name=name.toLowerCase();

                var s=document.defaultView.getComputedStyle(elem,”");

                return s&&s.getPropertyValue(name);

                }else{

                    return null

                    }

    }

//获取元素相对于这个页面的x和y坐标。    

function pageX(elem){

    return elem.offsetParent?(elem.offsetLeft+pageX(elem.offsetParent)):elem.offsetLeft;

        }

function pageY(elem){

    return elem.offsetParent?(elem.offsetTop+pageY(elem.offsetParent)):elem.offsetTop;

        }

//获取元素相对于父元素的x和y坐标。        

function parentX(elem){

    return elem.parentNode==elem.offsetParent?elem.offsetLeft:pageX(elem)-pageX(elem.parentNode);

    }

function parentY(elem){

    return elem.parentNode==elem.offsetParent?elem.offsetTop:pageY(elem)-pageY(elem.parentNode);

    }

//获取使用css定位的元素的x和y坐标。

function posX(elem){

    return parseInt(getStyle(elem,”left”));

    }    

function posY(elem){

    return parseInt(getStyle(elem,”top”));

    }

//设置元素位置。    

function setX(elem,pos){

    elem.style.left=pos+”px”;

    }    

function setY(elem,pos){

    elem.style.top=pos+”px”;

    }

//增加元素X和y坐标。    

function addX(elem,pos){

    set(elem,(posX(elem)+pos));

    }

function addY(elem,pos){

    set(elem,(posY(elem)+pos));

    }

//获取元素使用css控制大小的高度和宽度    

function getHeight(elem){

    return parseInt(getStyle(elem,”height”));

    }

function getWidth(elem){

    return parseInt(getStyle(elem,”width”));

    }

//获取元素可能,完整的高度和宽度

function getFullHeight(elem){

    if(getStyle(elem,”display”)!=”none”){

        return getHeight(elem)||elem.offsetHeight;

        }else{

        var old=resetCss(elem,{display:”block”,visibility:”hidden”,position:”absolute”});

        var h=elem.clientHeight||getHeight(elem);

        restoreCss(elem,old);

        return h;

        }

    }

function getFullWidth(elem){

    if(getStyle(elem,”display”)!=”none”){

        return getWidth(elem)||elem.offsetWidth;

        }else{

        var old=resetCss(elem,{display:”block”,visibility:”hidden”,position:”absolute”});

        var w=elem.clientWidth||getWidth(elem);

        restoreCss(elem,old);

        return w;

        }

    }

//设置css,并保存旧的css

function resetCss(elem,prop){

    var old={};

    for(var i in prop){

        old[i]=elem.style[i];

        elem.style[i]=prop[i];

        }

        return old;

    }

function restoreCss(elem,prop){

    for(var i in prop){

        elem.style[i]=prop[i];

        }

    }

//显示和隐藏

function show(elem){

    elem.style.display=elem.$oldDisplay||” “;

    }

function hide(elem){

var curDisplay=getStyle(elem,”display”);

if(curDisplay!=”none”){

         elem.$oldDisplay=curDisplay;

    elem.style.display=”none”;

       }

    }

//设置透明度    

function setOpacity(elem,num){

    if(elem.filters){

        elem.style.filter=”alpha(opacity=”+num+”)”;

        }else{

            elem.style.opacity=num/100;

            }

    }

//滑动    

function slideDown(elem){

    var h=getFullHeight(elem);

    elem.style.height=”0px”;

    show(elem);

    for(var i=0;i<=100;i+=5){

        new function(){

                  var pos=i;

                  setTimeout(function(){elem.style.height=(pos/100*h)+”px”;},(pos*10));

                  }

        }

    }

//渐变

function fadeIn(elem){    

         show(elem);

         setOpacity(elem,0);

    for(var i=0;i<=100;i+=5){

        new function(){

                  var pos=i;

                  setTimeout(function(){setOpacity(elem,pos);},(pos+1)*10);

                  }

        }

    }

//获取鼠标光标相对于整个页面的位置。    

function getX(e){

    e=e||window.event;

    return e.pageX||e.clientX+document.body.scrollLeft;

    }

function getY(e){

    e=e||window.event;

    return e.pageY||e.clientY+document.body.scrollTop;

    }

//获取鼠标光标相对于当前元素的位置。

function getElementX(e){

    return (e&&e.layerX)||window.event.offsetX;

    }

function getElementY(e){

    return (e&&e.layerY)||window.event.offsetY;

    }

//获取页面的高度和宽度

function getPageHeight(){

    var de=document.documentElement;

    return document.body.scrollHeight||(de&&de.scrollHeight);

    }

function getPageWidth(){

    var de=document.documentElement;

    return document.body.scrollWidth||(de&&de.scrollWidth);

    }

//获取滚动条的位置。

function scrollX(){

    var de=document.documentElement;

    return self.pageXOffset||(de&&de.scrollLeft)||document.body.scrollLeft;

    }

function scrollY(){

    var de=document.documentElement;

    return self.pageYOffset||(de&&de.scrollTop)||document.body.scrollTop;

    }

//获取视口的高度和宽度。    

function windowHeight() {

    var de = document.documentElement;

    return self.innerHeight||(de && de.offsetHeight)||document.body.offsetHeight;

}

function windowWidth() {

    var de = document.documentElement;

    return self.innerWidth||( de && de.offsetWidth )||document.body.offsetWidth;

}