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[JS]XPath类-操作XML工具类
XPath类：XPath类是用于对于XML的解析，加载，获取节点等操作（支持IE和FireFox）。
/* @class: XPath @author: Kinglong(kinglong@gmail.com) @version: 0.5 @link: http://www.klstudio.com @build: 20080122 @lib: none */ XPath = { getIEXmlAX:function (){ var i,activeXarr; var activeXarr = [ "MSXML4.DOMDocument", "MSXML3.DOMDocument", "MSXML2.DOMDocument", "MSXML.DOMDocument", "Microsoft.XmlDom" ]; for(i=0; i<activeXarr.length; i++){ try{ var o = new ActiveXObject(activeXarr[i]); return o; }catch(e){} } return false; } , parseXML:function(source){ try{ var domParser = new DOMParser(); var o = domParser.parseFromString(source,'text/xml'); return o.documentElement; }catch(e){ try{ var o = this.getIEXmlAX(); o.loadXML(source); return o.documentElement; }catch(e){ return null; } } } , loadXML:function(path){ var xmlDoc=null; if (window.ActiveXObject){ xmlDoc=this.getIEXmlAX(); }else if (document.implementation && document.implementation.createDocument){ xmlDoc=document.implementation.createDocument("","",null); }else{ alert('Your browser cannot handle this script'); } xmlDoc.async=false; xmlDoc.load(path); return xmlDoc; } , getChildren:function(node,name){ var nodes = []; for(var i=0;i<node.childNodes.length;i++){ if(node.childNodes[i].nodeName == name){ nodes[nodes.length] = node.childNodes[i]; } } return nodes; } , getChild:function(node,name){ for(var i=0;i<node.childNodes.length;i++){ if(node.childNodes[i].nodeName == name){ return node.childNodes[i]; } } return null; } , selectNodes:function(node,path,child){ var paths = path.split("/"); for(var i=0;i<paths.length;i++){ node = this.getChild(node,paths[i]); if(node == null){ return []; } } return this.getChildren(node,child); } , selectSingleNode:function(node,path){ var paths = path.split("/"); for(var i=0;i<paths.length;i++){ node = this.getChild(node,paths[i]); if(node == null){ return null; } } return node; } , getNodeValue:function(node){ return node.firstChild.nodeValue; } };
seXML(source)
     解析xml数据
     source为xml字符数据;
     返回值为xml的根节点;
XPath.loadXML(path)
     加载xml文件
     path为xml文件路径;
     返回值为xml的根节点
XPath.getChildren(node, name)
     获取node节点下所有name的子节点数组;
XPath.getChild(node, name)
     获取node节点下name的子节点;
XPath.selectNodes(node,path,child)
     获取node节点下的子节点数组;
     node为当前节点；
     path为节点路径；
     child为子节点名；
XPath.selectSingleNode(node,path)
     获取node节点下的子节点
     node为当前节点；
     path为节点路径；
XPath.getNodeValue(node)
     获取文本节点的值；

调用实例
var str = '\ <data> \ <keyword>7pt6kz4zj%2Cstpg176wb</keyword> \ <type>video</type> \ <count>2</count> \ <result> \ <video> \ <id>7pt6kz4zj</id> \ <title>%u9996%u90E8%u771F%u4EBA%u52A8%u6F2B%u8D3A%u5C81%u5267%u300A%u7535%u5F71%u5C11%u5973%u300B%u9884%u544A</title> \ <description>%u9996%u90E8%u771F%u4EBA%u52A8%u6F2B%u8D3A%u5C81%u5267%u300A%u7535%u5F71%u5C11%u5973%u300B%u9884%u544A</description> \ <tag>%u9884%u544A%u7247%20%u5F71%u89C6%20%u52A8%u6F2B</tag> \ <clicks>362</clicks> \ <image>http://video-i1.9you.com/78805a221a988e79ef3f42d7c5bfd418/small/7/p/7pt6kz4zj.jpg</image>\ <vote>0</vote>\ <voteClicks>2</voteClicks>\ <voteScore>6</voteScore>\ <userName>1207spsc02</userName>\ <nickName>%u00B0%u00B0%u309E%u9241%u7A00%u7231%u3003</nickName>\ <subClassID>ItdzrUU6C</subClassID>\ <topClassID>Ww63y9nRX</topClassID>\ <uploadDate>1199350023297</uploadDate> \ <fileSize>5727</fileSize> \ </video> \ <video> \ <id>7pt6kz4zj</id> \ <title>%u9996%u90E8%u771F%u4EBA%u52A8%u6F2B%u8D3A%u5C81%u5267%u300A%u7535%u5F71%u5C11%u5973%u300B%u9884%u544A</title> \ <description>%u9996%u90E8%u771F%u4EBA%u52A8%u6F2B%u8D3A%u5C81%u5267%u300A%u7535%u5F71%u5C11%u5973%u300B%u9884%u544A</description> \ <tag>%u9884%u544A%u7247%20%u5F71%u89C6%20%u52A8%u6F2B</tag> \ <clicks>362</clicks> \ <image>http://video-i1.9you.com/78805a221a988e79ef3f42d7c5bfd418/small/7/p/7pt6kz4zj.jpg</image>\ <vote>0</vote>\ <voteClicks>2</voteClicks>\ <voteScore>6</voteScore>\ <userName>1207spsc02</userName>\ <nickName>%u00B0%u00B0%u309E%u9241%u7A00%u7231%u3003</nickName>\ <subClassID>ItdzrUU6C</subClassID>\ <topClassID>Ww63y9nRX</topClassID>\ <uploadDate>1199350023297</uploadDate> \ <fileSize>5727</fileSize> \ </video> \ </result> \ </data> \ '; var node = XPath.parseXML(str); var n1 = XPath.getNodeValue(XPath.selectSingleNode(node,"count")); alert("count>>"+n1); var n2 = XPath.selectNodes(node,"result","video"); alert("result.length>>"+n2.length);