如何以跨浏览器的方式获取XML元素的属性?

使用 standard DOM instead of Microsoft's propriety approach. (Assuming you are talking about a proper XML document and not an IE4 era "XML data island")

好的,使用Firebug从这里得到了答案: Versatile xml attribute regex with javascript

element.ownerDocument.evaluate("//@"+attributeName, element.ownerDocument, null, XPathResult.UNORDERED_NODE_ITERATOR_TYPE, null).iterateNext().nodeValue;

        function GetAttributeValueFromXmlElement(element, attrName) {
        if (element && element.xml) {
            //msie
            return $(element.xml)[0].attributes.getNamedItem(attrName).value;
        } else {
            //standard DOM
            if (true/*Should check if there's only one here and only where expected to be*/) {
                return element.ownerDocument
                    .evaluate("//@" + attrName, element.ownerDocument, null
                    , XPathResult.UNORDERED_NODE_ITERATOR_TYPE, null)
                    .iterateNext().nodeValue;
            }
        }
    }