Jquery作者John Resig自己封装的常用函数

//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; }

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