curCSS = function( elem, name ) {    var ret,         computed = window.getComputedStyle( elem, null ),        style = elem.style;    if ( computed ) {        //getPropertyValue兼容ie9获取filter:Alpha(opacity=50)        ret = computed.getPropertyValue( name ) || computed[ name ];        //如果是动态创建的元素，则使用style方法获取样式        if ( ret === "" && !jQuery.contains( elem.ownerDocument, elem ) ) {            ret = jQuery.style( elem, name );        }                    .................    }    return ret;};