prototype.js

针对wav格式转换为mp3一些相关说明

      }else {
        elementStyle[(property=="float"||property=="cssFloat")?(elementStyle.styleFloat===undefined?"cssFloat":"styleFloat"):property]=styles[property];
      }
    }
    return element;
  },setOpacity:function(element,value){
    element=$(element);
    element.style.opacity=(value==1||value==="")?"":(value<0.00001)?0:value;
    return element;
  },getDimensions:function(element){
    element=$(element);
    var display=$(element).getStyle("display");
    if(display!="none"&&display!=null){
      return {width:element.offsetWidth,height:element.offsetHeight};
    }
    var els=element.style;
    var originalVisibility=els.visibility;
    var originalPosition=els.position;
    var originalDisplay=els.display;
    els.visibility="hidden";
    els.position="absolute";
    els.display="block";
    var originalWidth=element.clientWidth;
    var originalHeight=element.clientHeight;
    els.display=originalDisplay;
    els.position=originalPosition;
    els.visibility=originalVisibility;
    return {width:originalWidth,height:originalHeight};
  },makePositioned:function(element){
    element=$(element);
    var pos=Element.getStyle(element,"position");
    if(pos=="static"||!pos){
      element._madePositioned=true;
      element.style.position="relative";
      if(window.opera){
        element.style.top=0;
        element.style.left=0;
      }
    }
    return element;
  },undoPositioned:function(element){
    element=$(element);
    if(element._madePositioned){
      element._madePositioned=undefined;
      element.style.position=element.style.top=element.style.left=element.style.bottom=element.style.right="";
    }
    return element;
  },makeClipping:function(element){
    element=$(element);
    if(element._overflow){
      return element;
    }
    element._overflow=Element.getStyle(element,"overflow")||"auto";
    if(element._overflow!=="hidden"){
      element.style.overflow="hidden";
    }
    return element;
  },undoClipping:function(element){
    element=$(element);
    if(!element._overflow){
      return element;
    }
    element.style.overflow=element._overflow=="auto"?"":element._overflow;
    element._overflow=null;
    return element;
  },cumulativeOffset:function(element){
    var valueT=0,valueL=0;
    do {
      valueT+=element.offsetTop||0;
      valueL+=element.offsetLeft||0;
      element=element.offsetParent;
    }while(element);
    return Element._returnOffset(valueL,valueT);
  },positionedOffset:function(element){
    var valueT=0,valueL=0;
    do {
      valueT+=element.offsetTop||0;
      valueL+=element.offsetLeft||0;
      element=element.offsetParent;
      if(element){
        if(element.tagName=="BODY"){
          break ;
        }
        var p=Element.getStyle(element,"position");
        if(p=="relative"||p=="absolute"){
          break ;
        }
      }
    }while(element);
    return Element._returnOffset(valueL,valueT);
  },absolutize:function(element){
    element=$(element);
    if(element.getStyle("position")=="absolute"){
      return ;
    }
    var offsets=element.positionedOffset();
    var top=offsets[1];
    var left=offsets[0];
    var width=element.clientWidth;
    var height=element.clientHeight;
    element._originalLeft=left-parseFloat(element.style.left||0);
    element._originalTop=top-parseFloat(element.style.top||0);
    element._originalWidth=element.style.width;
    element._originalHeight=element.style.height;
    element.style.position="absolute";
    element.style.top=top+"px";
    element.style.left=left+"px";
    element.style.width=width+"px";
    element.style.height=height+"px";
    return element;
  },relativize:function(element){
    element=$(element);
    if(element.getStyle("position")=="relative"){
      return ;
    }
    element.style.position="relative";
    var top=parseFloat(element.style.top||0)-(element._originalTop||0);
    var left=parseFloat(element.style.left||0)-(element._originalLeft||0);
    element.style.top=top+"px";
    element.style.left=left+"px";
    element.style.height=element._originalHeight;
    element.style.width=element._originalWidth;
    return element;
  },cumulativeScrollOffset:function(element){
    var valueT=0,valueL=0;
    do {
      valueT+=element.scrollTop||0;
      valueL+=element.scrollLeft||0;
      element=element.parentNode;
    }while(element);
    return Element._returnOffset(valueL,valueT);
  },getOffsetParent:function(element){
    if(element["offsetParent"]){
      return $(element.offsetParent);
    }
    if(element==document.body){
      return $(element);
    }
    while((element=element.parentNode)&&element!=document.body){
      if(Element.getStyle(element,"position")!="static"){
        return $(element);
      }
    }
    return $(document.body);
  },viewportOffset:function(forElement){
    var valueT=0,valueL=0;
    var element=forElement;
    do {
      valueT+=element.offsetTop||0;
      valueL+=element.offsetLeft||0;
      if(element.offsetParent==document.body&&Element.getStyle(element,"position")=="absolute"){
        break ;
      }
    }while(element=element.offsetParent);
    element=forElement;
    do {
      if(!Prototype.Browser.Opera||element.tagName=="BODY"){
        valueT-=element.scrollTop||0;
        valueL-=element.scrollLeft||0;
      }
    }while(element=element.parentNode);
    return Element._returnOffset(valueL,valueT);
  },clonePosition:function(element,source){
    var options=Object.extend({setLeft:true,setTop:true,setWidth:true,setHeight:true,offsetTop:0,offsetLeft:0},arguments[2]||{});
    source=$(source);
    var p=source.viewportOffset();
    element=$(element);
    var delta=[0,0];
    var parent=null;
    if(Element.getStyle(element,"position")=="absolute"){
      parent=element.getOffsetParent();
      delta=parent.viewportOffset();
    }
    if(parent==document.body){
      delta[0]-=document.body.offsetLeft;
      delta[1]-=document.body.offsetTop;
    }
    if(options.setLeft){
      element.style.left=(p[0]-delta[0]+options.offsetLeft)+"px";
    }
    if(options.setTop){
      element.style.top=(p[1]-delta[1]+options.offsetTop)+"px";
    }
    if(options.setWidth){
      element.style.width=source.offsetWidth+"px";
    }
    if(options.setHeight){
      element.style.height=source.offsetHeight+"px";
    }
    return element;
  }};
Element.Methods.identify.counter=1;
Object.extend(Element.Methods,{getElementsBySelector:Element.Methods.select,childElements:Element.Methods.immediateDescendants});
Element._attributeTranslations={write:{names:{className:"class",htmlFor:"for"},values:{}}};
if(!document.createRange||Prototype.Browser.Opera){
  Element.Methods.insert=function(element,insertions){
    element=$(element);
    if(Object.isString(insertions)||Object.isNumber(insertions)||Object.isElement(insertions)||(insertions&&(insertions.toElement||insertions.toHTML))){
      insertions={bottom:insertions};
    }
    var t=Element._insertionTranslations,content,position,pos,tagName;
    for(position in insertions){
      content=insertions[position];
      position=position.toLowerCase();
      pos=t[position];
      if(content&&content.toElement){
        content=content.toElement();
      }
      if(Object.isElement(content)){
        pos.insert(element,content);
        continue ;
      }
      content=Object.toHTML(content);
      tagName=((position=="before"||position=="after")?element.parentNode:element).tagName.toUpperCase();
      if(t.tags[tagName]){
        var fragments=Element._getContentFromAnonymousElement(tagName,content.stripScripts());
        if(position=="top"||position=="after"){
          fragments.reverse();
        }
        fragments.each(pos.insert.curry(element));
      }else {
        element.insertAdjacentHTML(pos.adjacency,content.stripScripts());
      }
      content.evalScripts.bind(content).defer();
    }
    return element;
  };
}
if(Prototype.Browser.Opera){
  Element.Methods._getStyle=Element.Methods.getStyle;
  Element.Methods.getStyle=function(element,style){
    switch(style){
    case "left":
    case "top":
    case "right":
    case "bottom":
      if(Element._getStyle(element,"position")=="static"){
        return null;
      }
    default:
      return Element._getStyle(element,style);
    }
  };
  Element.Methods._readAttribute=Element.Methods.readAttribute;
  Element.Methods.readAttribute=function(element,attribute){
    if(attribute=="title"){
      return element.title;
    }
    return Element._readAttribute(element,attribute);
  };
}else {
  if(Prototype.Browser.IE){
    $w("positionedOffset getOffsetParent viewportOffset").each(function(method){
      Element.Methods[method]=Element.Methods[method].wrap(function(proceed,element){
        element=$(element);
        var position=element.getStyle("position");
        if(position!="static"){
          return proceed(element);
        }
        element.setStyle({position:"relative"});
        var value=proceed(element);
        element.setStyle({position:position});
        return value;
      });
    });
    Element.Methods.getStyle=function(element,style){
      element=$(element);
      style=(style=="float"||style=="cssFloat")?"styleFloat":style.camelize();
      var value=element.style[style];
      if(!value&&element.currentStyle){
        value=element.currentStyle[style];
      }
      if(style=="opacity"){
        if(value=(element.getStyle("filter")||"").match(/alpha\(opacity=(.*)\)/)){
          if(value[1]){
            return parseFloat(value[1])/100;
          }
        }
        return 1;
      }
      if(value=="auto"){
        if((style=="width"||style=="height")&&(element.getStyle("display")!="none")){
          return element["offset"+style.capitalize()]+"px";
        }
        return null;
      }
      return value;
    };
    Element.Methods.setOpacity=function(element,value){
      function stripAlpha(filter){
        return filter.replace(/alpha\([^\)]*\)/gi,"");
      }
      element=$(element);
      var currentStyle=element.currentStyle;
      if((currentStyle&&!currentStyle.hasLayout)||(!currentStyle&&element.style.zoom=="normal")){
        element.style.zoom=1;
      }
      var filter=element.getStyle("filter"),style=element.style;
      if(value==1||value===""){
        (filter=stripAlpha(filter))?style.filter=filter:style.removeAttribute("filter");
        return element;
      }else {
        if(value<0.00001){
          value=0;
        }
      }
      style.filter=stripAlpha(filter)+"alpha(opacity="+(value*100)+")";
      return element;
    };
    Element._attributeTranslations={read:{names:{"class":"className","for":"htmlFor"},values:{_getAttr:function(element,attribute){
            return element.getAttribute(attribute,2);
          },_getAttrNode:function(element,attribute){
            var node=element.getAttributeNode(attribute);
            return node?node.value:"";
          },_getEv:function(element,attribute){
            var attribute=element.getAttribute(attribute);
            return attribute?attribute.toString().slice(23,-2):null;
          },_flag:function(element,attribute){
            return $(element).hasAttribute(attribute)?attribute:null;
          },style:function(element){
            return element.style.cssText.toLowerCase();
          },title:function(element){
            return element.title;
          }}}};
    Element._attributeTranslations.write={names:Object.clone(Element._attributeTranslations.read.names),values:{checked:function(element,value){
          element.checked=!!value;
        },style:function(element,value){
          element.style.cssText=value?value:"";
        }}};
    Element._attributeTranslations.has={};
    $w("colSpan rowSpan vAlign dateTime accessKey tabIndex "+"encType maxLength readOnly longDesc").each(function(attr){
      Element._attributeTranslations.write.names[attr.toLowerCase()]=attr;
      Element._attributeTranslations.has[attr.toLowerCase()]=attr;
    });
    (function(v){
      Object.extend(v,{href:v._getAttr,src:v._getAttr,type:v._getAttr,action:v._getAttrNode,disabled:v._flag,checked:v._flag,readonly:v._flag,multiple:v._flag,onload:v._getEv,onunload:v._getEv,onclick:v._getEv,ondblclick:v._getEv,onmousedown:v._getEv,onmouseup:v._getEv,onmouseover:v._getEv,onmousemove:v._getEv,onmouseout:v._getEv,onfocus:v._getEv,onblur:v._getEv,onkeypress:v._getEv,onkeydown:v._getEv,onkeyup:v._getEv,onsubmit:v._getEv,onreset:v._getEv,onselect:v._getEv,onchange:v._getEv});
    })(Element._attributeTranslations.read.values);
  }else {
    if(Prototype.Browser.Gecko&&/rv:1\.8\.0/.test(navigator.userAgent)){
      Element.Methods.setOpacity=function(element,value){
        element=$(element);
        element.style.opacity=(value==1)?0.999999:(value==="")?"":(value<0.00001)?0:value;
        return element;
      };
    }else {
      if(Prototype.Browser.WebKit){
        Element.Methods.setOpacity=function(element,value){
          element=$(element);
          element.style.opacity=(value==1||value==="")?"":(value<0.00001)?0:value;
          if(value==1){
            if(element.tagName=="IMG"&&element.width){
              element.width++;
              element.width--;
            }else {
              try{
                var n=document.createTextNode(" ");
                element.appendChild(n);
                element.removeChild(n);
              }
              catch(e){
              }
            }
          }
          return element;
        };
        Element.Methods.cumulativeOffset=function(element){
          var valueT=0,valueL=0;
          do {
            valueT+=element.offsetTop||0;
            valueL+=element.offsetLeft||0;
            if(element.offsetParent==document.body){
              if(Element.getStyle(element,"position")=="absolute"){
                break ;
              }
            }
            element=element.offsetParent;
          }while(element);
          return Element._returnOffset