XML常用之封装函数

 1 function testXML2(){
 2     var xmldom = document.implementation.createDocument("", "root", null);
 3     // alert(xmldom.documentElement.tagName); //"root"
 4     var child = xmldom.createElement("child");
 5     xmldom.documentElement.appendChild(child);
 6 
 7     xmldom.async = true;
 8     xmldom.onreadystatechange = function(){
 9         if (xmldom.readyState == 4){
10             if (xmldom.parseError != 0){
11                 alert("An error occurred:\nError Code: "
12                 + xmldom.parseError.errorCode + "\n"
13                 + "Line: " + xmldom.parseError.line + "\n"
14                 + "Line Pos: " + xmldom.parseError.linepos + "\n"
15                 + "Reason: " + xmldom.parseError.reason);
16             } else {
17                 alert(xmldom.documentElement.tagName); //"root"
18                 alert(xmldom.documentElement.firstChild.tagName); //"child"
19                 var anotherChild = xmldom.createElement("child");
20                 xmldom.documentElement.appendChild(anotherChild);
21                 var children = xmldom.getElementsByTagName("child");
22                 alert(children.length); //2
23                 alert(xmldom.xml);
24             }
25         }
26     };
27     xmldom.load("example.xml");
28 }
29 // 解析 XML ,跨浏览器方法
30 // parseXml()函数只接收一个参数，即可解析的 XML 字符串
31 function parseXml(xml){
32     var xmldom = null;
33     if (typeof DOMParser != "undefined"){
34         xmldom = (new DOMParser()).parseFromString(xml, "text/xml");
35         var errors = xmldom.getElementsByTagName("parsererror");
36         if (errors.length){
37             throw new Error("XML parsing error:" + errors[0].textContent);
38         }
39     } else if (typeof ActiveXObject != "undefined"){
40         xmldom = createDocument();
41         xmldom.loadXML(xml);
42         if (xmldom.parseError != 0){
43             throw new Error("XML parsing error: " + xmldom.parseError.reason);
44         }
45     } else {
46         throw new Error("No XML parser available.");
47     }
48     return xmldom;
49 }
50 // 序列化 XML ,跨浏览器方法
51 // serializeXml()函数接收一个参数，即要序列化的 XML DOM 文档
52 function serializeXml(xmldom){
53     if (typeof XMLSerializer != "undefined"){
54         return (new XMLSerializer()).serializeToString(xmldom);
55     } else if (typeof xmldom.xml != "undefined"){
56         return xmldom.xml;
57     } else {
58         throw new Error("Could not serialize XML DOM.");
59     }
60 }