javascript生成 解析dom的CDATA类型的字段的代码

两段demo代码如下(for ie only)：
<script type="text/javascript">
//demo1
var xmlDoc = new ActiveXObject("Msxml2.DOMDocument");
var root;
var CDATASection;
xmlDoc.async = false;
xmlDoc.loadXML("<a/>");
root = xmlDoc.documentElement;
CDATASection = xmlDoc.createCDATASection("Hello World!");
root.appendChild(CDATASection);
b=xmlDoc.createElement("Test")
b.text="hahahahaha"
root.appendChild(b);
alert(root.xml);
for(i =0;i<root.childNodes.length;i++)

if(root.childNodes[i].nodeType==4)
alert(root.childNodes[i].nodeValue)

</script>

<script type="text/javascript">
//demo2
var xmlDoc = new ActiveXObject("Msxml2.DOMDocument");
xmlDoc.async = false;
xmlDoc.loadXML("<a><![CDATA[aaaaaaaaaaaaaaaaaaaaa]]></a>");
root = xmlDoc.documentElement;
for(i =0;i<root.childNodes.length;i++)

if(root.childNodes[i].nodeType==4)
alert(root.childNodes[i].nodeValue)

</script>
//demo3( for firefox)
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
< HTML >
< HEAD >
< TITLE > 使firefox对xml的处理兼容IE的selectSingleNode selectNodes方法 </ TITLE >
< META NAME ="Author" CONTENT ="emu" >
< META NAME ="Keywords" CONTENT ="firefox IE selectSingleNode selectNodes" >
< META NAME ="Description" CONTENT ="使firefox可以支持selectSingleNode selectNodes方法" >
< SCRIPT LANGUAGE ="JavaScript" >
<!--
var isIE = !! document.all;

function parseXML(st){
if (isIE)
var result = new ActiveXObject( " microsoft.XMLDOM " );
result.loadXML(st);
else
var parser = new DOMParser();
var result = parser.parseFromString(st, " text/xml " );

return result;
}

if ( ! isIE){
var ex;
XMLDocument.prototype.__proto__.__defineGetter__( " xml " , function (){
try
return new XMLSerializer().serializeToString( this );
catch (ex)
var d = document.createElement( " div " );
d.appendChild( this .cloneNode( true ));
return d.innerHTML;

});
Element.prototype.__proto__.__defineGetter__( " xml " , function (){
try
return new XMLSerializer().serializeToString( this );
catch (ex)
var d = document.createElement( " div " );
d.appendChild( this .cloneNode( true ));
return d.innerHTML;

});
XMLDocument.prototype.__proto__.__defineGetter__( " text " , function ()
return this .firstChild.textContent
);
Element.prototype.__proto__.__defineGetter__( " text " , function ()
return this .textContent
);

XMLDocument.prototype.selectSingleNode = Element.prototype.selectSingleNode = function (xpath)
var x = this .selectNodes(xpath)
if ( ! x
XMLDocument.prototype.selectNodes = Element.prototype.selectNodes = function (xpath)
var xpe = new XPathEvaluator();
var nsResolver = xpe.createNSResolver( this .ownerDocument == null ?
this .documentElement : this .ownerDocument.documentElement);
var result = xpe.evaluate(xpath, this , nsResolver, 0 , null );
var found = [];
var res;
while (res = result.iterateNext())
found.push(res);
return found;

}

var x = parseXML( " <people> <person first-name=\ " eric\ " middle-initial=\ " H\ " last-name=\ " jung\ " > <address street=\ " 321 south st\ " city=\ " denver\ " state=\ " co\ " country=\ " usa\ " /> <address street=\ " 123 main st\ " city=\ " arlington\ " state=\ " ma\ " country=\ " usa\ " /> </person> <person first-name=\ " jed\ " last-name=\ " brown\ " > <address street=\ " 321 north st\ " city=\ " atlanta\ " state=\ " ga\ " country=\ " usa\ " /> <address street=\ " 123 west st\ " city=\ " seattle\ " state=\ " wa\ " country=\ " usa\ " /> <address street=\ " 321 south avenue\ " city=\ " denver\ " state=\ " co\ " country=\ " usa\ " /> </person></people> " );

alert( " 搜索所有人的姓氏（last-name） " )
var results = x.selectNodes( " //person/@last-name " );
for ( var i = 0 ; i < results.length;i ++ )
alert( " Person # " + i + " has the last name " + results[i].nodeValue);

alert( " 搜索第二个人 " );
// IE是以0为下标基数的，而不是1
if ( ! document.all)
results = x.selectSingleNode( " /people/person[2] " );
else
results = x.selectSingleNode( " /people/person[1] " );
alert(results.xml)

alert( " 获得住址在donver街上的人 " );
results = x.selectNodes( " //person[address/@city='denver'] " );
for ( var i = 0 ; i < results.length;i ++ )alert(results[i].xml)

if ( ! document.all)
// 获得所有街名中带south的地址
results = x.selectNodes( " //address[contains(@street, 'south')] " );
alert(results[ 0 ].xml);
else
alert( " IE不支持 //address[contains(@street, 'south')] 这种查询方式 " )

// -->
</ SCRIPT >
</ HEAD >

< BODY >

</ BODY >
</ HTML >

//demo4( cross brower)