我的AJAX应用程序正常工作在Firefox，但不是在IE8。具体而言，Ajax功能不起作用。

My ajax app works fine in Firefox, but not in IE8. Specifically, the ajax functionality doesn't work.

这里的code我使用：

Here's the code I'm using:

function createXMLHttpRequest()
{
  if (window.XMLHttpRequest)
  {
    // code for IE7+, Firefox, Chrome, Opera, Safari
    return new XMLHttpRequest();
  }

  if (window.ActiveXObject)
  {
    // code for IE6, IE5
    return new ActiveXObject("Microsoft.XMLHTTP");
  }

  return null;
}

这是错误：

Object doesn't support this property or method
ajax.js
Code:0
Line : 6
Char : 5

它可以完美的在Firefox浏览器。

It works perfect in Firefox.

什么是我的code中的问题？

What is the problem with my code ?

推荐答案

考虑使用功能，像这样的：

Consider using a function such as this:

 function createXMLHttpRequest() {
  var xmlhttp = false;
  if (window.XMLHttpRequest) {
   xmlhttp = new XMLHttpRequest();
  } else if(window.ActiveXObject) {
   try {
    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
   } catch (e) {
    try {
     xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (e) {
     xmlhttp = false;
    }
   }
  }
  return xmlhttp;
 };

测试对于新的XMLHTTP插件中的ActiveX，还是默认为旧的。

Which tests for the new XMLHttp plugin in ActiveX, or defaults to the old one.

更新：试试这个：

function createXMLHttpRequest()
{
  var xmlhttp, bComplete = false;
  try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); }
  catch (e) { try { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); }
  catch (e) { try { xmlhttp = new XMLHttpRequest(); }
  catch (e) { xmlhttp = false; }}}
  if (!xmlhttp) return null;
  this.connect = function(sURL, sMethod, sVars, fnDone)
  {
    if (!xmlhttp) return false;
    bComplete = false;
    sMethod = sMethod.toUpperCase();

    try {
      if (sMethod == "GET")
      {
        xmlhttp.open(sMethod, sURL+"?"+sVars, true);
        sVars = "";
      }
      else
      {
        xmlhttp.open(sMethod, sURL, true);
        xmlhttp.setRequestHeader("Method", "POST "+sURL+" HTTP/1.1");
        xmlhttp.setRequestHeader("Content-Type",
          "application/x-www-form-urlencoded");
      }
      xmlhttp.onreadystatechange = function(){
        if (xmlhttp.readyState == 4 && !bComplete)
        {
          bComplete = true;
          fnDone(xmlhttp);
        }};
      xmlhttp.send(sVars);
    }
    catch(z) { return false; }
    return true;
  };
  return this;
}

function getModIndex(val) {
    var divEle = "IndexDiv" + val;
    var request = createXMLHttpRequest();

    if ( !request ) { 
    alert( request )
    return false
    }

    var callback = function( oXML ) {
    document.getElementById( divEle ).innerHTML = oXML.responseText;
    }

    request.connect(
    '../ajax/ajax-GetIndex.php',
    'POST',
    'id=' + val,
    callback
    );
}