Ajax应用程序适用于一些浏览器,而不是其他浏览器

Question

我的ajax应用程序在Firefox中运行良好,但在IE8中运行不正常.具体来说,ajax功能不起作用.

这是我正在使用的代码:

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

它在Firefox中完美运行.

我的代码有什么问题？

Answer 1

直接从jQuery:

return window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") :
                              new XMLHttpRequest();

Answer 2

考虑使用如下函数：

 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;
 };

它测试 ActiveX 中的新 XMLHttp 插件，或默认使用旧插件。

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
    );
}