用activexobject或xmlhttprequest对象读服务器上的XML文件怎么读不到？那里有问题？
var http;
function createhttp()
{
  if(window.ActiveXObject)
  {
  http = new window.ActiveXObject("Microsoft.XMLHTTP");
  }
  else if(window.XMLHttpRequest)
  {
  http = new XMLHttpRequest();
  }
}

function execut()
{
  createhttp();
  http.onreadystatechange = fan();
  http.open("POST",XMLFile.xml,true);
  http.send(null);
}

function fan()
{
  if(http.readyState == 4)
  {
   
  if(http.status == 200)
  {
  var doc = http.responseXML;
  var data = doc.getElementByTagName("Data")[0].firstChild.nodeValue;
  var node = document.getElementById("d");
  node.innerHTML = "<b>"+data+"</b>";
  }
  }
}

XML文件
<?xml version="1.0" encoding="utf-8" ?>
<XMLHTTP>
  <Data>
  Hi!
  </Data>
</XMLHTTP>

------解决方案--------------------
少了s,写js时ie里的脚本错误调试要记得开着 
var data = doc.getElementsByTagName("Data")[0].firstChild.nodeValue;