javascript跨浏览器操作xml

//跨浏览器获取xmlDom

 1 function getXMLDOM(xmlStr) {
 2     var xmlDom = null;
 3     if (typeof window.DOMParser != 'undefined') {
 4         xmlDom = (new DOMParser).parseFromString(xmlStr,'text/xml'); //创建xmlDom对象
 5         var errors = xmlDom.getElementsByTagName('parsererror');
 6         if(errors.length > 0) {
 7             throw new Error('XML格式有误:'+errors[0].textContent);
 8         }
 9         return xmlDom;
10     } else if (typeof window.ActiveXObject != 'undefined') {
11         var version = [
12             'MSXML2.DOMDocument.6.0',
13             'MSXML2.DOMDocument.3.0',
14             'MSXML2.DOMDocument'
15         ];
16         for(var i=0;i<version.length;i++) {
17             try {
18                 var xmlDom = new ActiveXObject(version[i]);
19             } catch (e) {
20                 //遇到错误跳过,继续执行try
21             }
22         }
23         xmlDom.loadXML(xmlStr);
24         if(xmlDom.parseError != 0) { //使用 !+ 号
25             throw new Error('错误信息为:' + xmlDom.parseError.reason);
26         }
27         return xmlDom;
28     } else {
29         throw new Error('系统或浏览器不支持xmlDom对象!');
30     }
31     return xmlDom;
32 }

/*
DOM2没有序列化XML的属性，XMLSerializer类型来帮助序列化XML字符串。
IE9、Safari、Chrome和Opera都支持这个类型。
*/

 1 function serializerXML(xmlDom) {
 2     var xml = null;
 3     if(typeof window.XMLSerializer != 'undefined') {//w3c的序列化
 4             var serializer = new XMLSerializer();
 5             xml = serializer.serializeToString(xmlDom);
 6     } else if(typeof xmlDom.xml != 'undefined') { //ie直接序列化
 7             xml = xmlDom.xml;
 8     }
 9     return xml;
10 }

//跨浏览器获取xml单一节点

 1 function selectSingleNode(xmlDom,xpath) {
 2     var node = null;
 3     if(typeof xmlDom.evaluate != 'undefined') { //w3c
 4         var patt = /[(d+)]/;
 5         var num = null;
 6         var flag = xpath.match(patt);
 7         if (flag) {
 8             num = parseInt(RegExp.$1) + 1;//w3c下标从1开始,如0加1
 9             xpath = xpath.replace(patt,'['+num+']'); //root/user[1]
10         }
11         var result = xmlDom.evaluate(xpath,xmlDom,null,XPathResult.FIRST_ORDERED_NODE_TYPE,null);
12         if(result != null) {
13             node = result.singleNodeValue; //w3c默认的下标是1
14         }
15     } else if (typeof xmlDom.selectSingleNode != 'undefined') {//ie中unknown而非 undefined
16         node = xmlDom.selectSingleNode(xpath);
17     }
18     return node;
19 }

//跨浏览器获取xml所有节点

 1 function selectNodes(xmlDom,xpath) {
 2     var nodes = [];
 3     if(typeof xmlDom.evaluate != 'undefined') { //w3c
 4         var patt = /[(d+)]/;
 5         var num = null;
 6         var flag = xpath.match(patt);
 7         if(flag) {
 8             num = parseInt(RegExp.$1) + 1;
 9             xpath = xpath.replace(patt,'['+num+']');
10         }
11         var result = xmlDom.evaluate(xpath,xmlDom,null,XPathResult.ORDERED_NODE_ITERATOR_TYPE,null);
12         var node = null;
13         if(result != null) {
14             while ((node = result.iterateNext()) !== null) {
15                 nodes.push(node);
16             }
17         }
18     } else if (typeof xmlDom.selectNodes != 'undefined') { //unkonwn
19         nodes = xmlDom.selectNodes(xpath);
20     }
21     return nodes;
22 }

1 var xmlStr = '<root><name id="d1">du1</name><name id="d2">du2</name></root>';
2 var xmlDom = getXMLDOM(xmlStr);
3 var nodes = selectNodes(xmlDom,'root/name');
4 //alert(nodes.length);
5 //alert(serializerXML(xmlDom)); //序列化xmlStr
6 //alert(serializerXML(selectSingleNode(xmlDom,'root/name[0]'))); //序列化单一节点
7 
8 alert(serializerXML(nodes[0]));//<name id="d1">du1</name>
9 alert(serializerXML(nodes[1]));