curcss

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在ie下面有3中获取样式的方法

elem.style

elem.currentStyle

elem.runtimeStyle

elem.stlye

指的是元素上面的样式

如

xx.style.height就是200px

但是

是取不到值得

elem.currentStyle

获取元素的当前样式(优先级别高的样式)

alert(document.getElementById('xx').currentStyle.height)

elem.runtimeStyle

runtimeStyle简单的说就是你可以对一个节点的样式赋值，他将成为最高优先级的节点样式

当指定了runtimeStyle，那么当前显示的样式以runtimeStyle为准，如果取消了runtimeStyle，那么当前显示样式就恢复到currentStyle的样式

<body>
<div id='xx' style="height:20px;"></div>
<script type="text/javascript">
window.onload = function(){
var xx = document.getElementById("xx");
//xx.runtimeStyle.color="black";
alert(xx.currentStyle.height);
alert(xx.runtimeStyle.height);
alert(xx.style.height);
xx.runtimeStyle.height="30px";
alert(xx.currentStyle.height);
alert(xx.runtimeStyle.height);
alert(xx.style.height);
}

</script>
</body>

w3c获取样式的方法

document.defaultView.getComputedStyle

一个例子

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>attr</title>
<link href="manage.css" mce_href="manage.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="xx" style="height:20px"></div>

callback.call( elem );

// Revert the old values
for ( var name in options )
  elem.style[ name ] = old[ name ];
}
function css( elem, name, force, extra ){
if( name == "width" || name == "height" ){
  var val,
   props = { position: "absolute", visibility: "hidden", display:"block" },
   which = name == "width" ? [ "Left", "Right" ] : [ "Top", "Bottom" ];
  function getWH() {
   val = name == "width" ? elem.offsetWidth : elem.offsetHeight;

if ( extra === "border" )
return;

   jQuery.each( which, function() {
    if ( !extra )
     val -= parseFloat(jQuery.curCSS( elem, "padding" + this, true)) || 0;
    if ( extra === "margin" )
     val += parseFloat(jQuery.curCSS( elem, "margin" + this, true)) || 0;
    else
     val -= parseFloat(jQuery.curCSS( elem, "border" + this + "Width", true)) || 0;
   });
   if ( elem.offsetWidth !== 0 )
    getWH();
   else
    jQuery.swap( elem, props, getWH );

return Math.max(0, Math.round(val));
}
}
return jQuery.curCSS( elem, name, force );
}*/

function curCSS(elem, name, force){
var ret, style = elem.style;

/*if ( name == "opacity" && !jQuery.support.opacity ) {
ret = jQuery.attr( style, "opacity" );

  return ret == "" ?
   "1" :
   ret;
}*/

if ( name.match( /float/i ) )
  name = !-[1,]? "cssFloat" : "styleFloat";

//如果在元素的style上就从style上面取
if ( !force && style && style[ name ] ){
  ret = style[ name ];
}else if(document.defaultView.getComputedStyle){
  // Only "float" is needed here
  if ( name.match( /float/i ) )
   name = "float";
  //将大写字母转成一杠加以个小写字母 A ===> -a
  name = name.replace( /([A-Z])/g, "-$1" ).toLowerCase();

  var computedStyle = document.defaultView.getComputedStyle( elem, null );

  if(computedStyle)
   ret = computedStyle.getPropertyValue( name );

  if ( name == "opacity" && ret == "" )
   ret = "1";
}else if ( elem.currentStyle ) {
  var camelCase = name.replace(/\-(\w)/g, function(all, letter){
   return letter.toUpperCase();
  });
  ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];
  if ( !/^\d+(px)?$/i.test( ret ) && /^\d/.test( ret ) ) {
   // Remember the original values
   var left = style.left, rsLeft = elem.runtimeStyle.left;
   // Put in the new values to get a computed value out
   elem.runtimeStyle.left = elem.currentStyle.left;
   style.left = ret || 0;
   ret = style.pixelLeft + "px";
   // Revert the changed values
   style.left = left;
   elem.runtimeStyle.left = rsLeft;
  }
}
return ret;
}

window.onload = function(){
var div = document.getElementById('xx')
alert(curCSS(div,'height'));
alert(curCSS(div,'width'));
}
</script>
</body>
</html>