jQuery 操作 XML(解决大小写问题）

jQuery操作xml时候，不同浏览器会产生大小写不一致的问题， 参考了下网上一些的例子，写的很简单易懂， 简单改了写代码做个标记。

/**
 * @description 
 * 		 Operation of the XML
 * @deprecated 
 * 		JQuery.js
 * @version 1.0
 * Date: 2013-09-16
 */
(function($) {
    function mnpXml(opCode, xmlStr) {
        return this.each(function() {
            if (typeof xmlStr != "string") return;
            if (!jQuery.isXMLDoc(this)) return;
            var node = $.parseXML(xmlStr).firstChild.cloneNode(true);
            switch (opCode) {
                case "append":
                    this.appendChild(node);
                    break;
                case "prepend":
                    if (this.childNodes.length > 0)
                        this.insertBefore(node, this.firstChild);
                    else
                        this.appendChild(node);
                    break;
                case "after":
                    if (this.nextSibling)
                        this.parentNode.insertBefore(node, this.nextSibling);
                    else
                        this.parentNode.appendChild(node);
                    break;
                case "before":
                    this.parentNode.insertBefore(node, this);
                    break;
            }
        });
    }
    $.fn.extend({
        appendXml: function(s) {
            return mnpXml.call(this, "append", s);
        },
        prependXml: function(s) {
            return mnpXml.call(this, "prepend", s);
        },
        afterXml: function(s) {
            return mnpXml.call(this, "after", s);
        },
        beforeXml: function(s) {
            return mnpXml.call(this, "before", s);
        },
        xml: function() {
            var elem = this[0];
            return elem.xml || (new XMLSerializer()).serializeToString(elem);
        },
        innerXml: function() {
            var s = this.xml();
            var i = s.indexOf(">"), j = s.lastIndexOf("<");
            if (j > i)
                return s.substring(i + 1, j);
            else
                return "";
        }
    });
    $.extend(jQuery, {
        parseXml: function(xmlStr) {
            if (window.ActiveXObject) {
                var xd = new ActiveXObject("Microsoft.XMLDOM");
                xd.async = false;
                xd.loadXML(xmlStr);
                return xd;
            }
            else if (typeof DOMParser != "undefined") {
                var xd = new DOMParser().parseFromString(xmlStr, "text/xml");
                return xd;
            }
            else return null;
        }
    });
})(jQuery);