ajax中的getElementByTagName("..").length返回为0 狂郁闷 - ASP技术论坛

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ajax中的getElementByTagName("..").length返回为0 狂郁闷

parseXML.html

程序代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www. xmlns="http://www. http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>paesing XML Response with the w3c DOM</title>
<script type="text/javascript">
var xmlHttp;
var requestType="";
function createXMLHttpRequest()
{
  if(window.ActiveXObject){
       xmlHttp=new ActiveXObject("Microsoft.XMLHttp");
    }
   else if(window.XMLHttpRequest){
       xmlHttp=new XMLHttpRequest();
    }
}
function startRequest(requestedList)
{
  requestType=requestedList;
  createXMLHttpRequest();
  xmlHttp.onreadystatechange=handleStateChange;
  xmlHttp.open("GET","parseXML.xml",true);
  xmlHttp.send(null);
}
function handleStateChange()
{
  if(xmlHttp.readyState==4){
        if(xmlHttp.status==200){
              if(requestType=="north"){
                 listNothStates();
              }
              else if(requestType=="all"){
                 listAllStates();
              }
         }
   }
}
function listNorthStates()
{
  var xmlDoc=xmlHttp.responseXML;
  var northNode=xmlDoc.getElementsByTagName("north")[0];
  var out="Northern States";
  var northStates=northNode.getElementsByTagName("state");
  outputList("Northern States ",northStates);
}
function listAllStates()
{ 
  var xmlDoc=xmlHttp.responseXML;
  var allStates=xmlDoc.getElementsByTagName("state");
  outputList("All States in Document",allStates);
}
function outputList(title,states)
{ 
  var out=title;
  var currentState=null;
  for(var i=0;i<states.length;i++)
  {
    currentState=states[i];
    out=out+"\n-"+currentState.childNodes[0].nodeValue;
  }
  alert(out);
}
</script>
</head>

<body>
<h1>process xml document of u.s. states</h1>
<form action="#">
<br /><br />
<input type="button" value="view all listed states"
  onclick="startRequest('all');" />
<br /><br />
<input type="button" value="view all listed north northern states"
  onclick="startRequest('north');" />
  </form>
</body>
</html>

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parseXML.xml <?xml version="1.0" encoding="UTF-8"?> <states> <north> <state>Minnesota</state> <state>Iowa</state> <state>North Dakota</state> </north> <south> <state>Texas</state> <state>Oklahoma</state> <state>Louisiana</state> </south> <east> <state>New York</state> <state>North Carolina</state> <state>Massachusetts</state> </east> <west> <state>California</state> <state>Oregon</state> <state>Nevada</state> </west> </states>