创建不了XMLHTTP控件

最近在用ajax开发服务器程序，发现IE浏览器不支持xmlhttprequest对象，而且找不到Microsoft.XMLHTTP控件。

问题出现了我们需要解决，解决方案如下：

1、运行下regsvr32 msxml3.dll；
2、用现成的框架来做ajax；
3、代码优化：

if(window.ActiveXObject)
{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest)
{
xmlHttp = new XMLHttpRequest();
}

if(handle_s == null)
handle_s = "bin/normal.py/db";
this.xmlHttp.onreadystatechange = handle_l;
this.xmlHttp.open("GET",handle_s,true);
this.xmlHttp.send(null);

或判断浏览器

var agt = navigator.userAgent.toLowerCase();
var is_ie = (agt.indexOf("msie") != -1);
var is_ie5 = (agt.indexOf("msie 5") != -1);
var is_opera = (agt.indexOf("opera") != -1);
var is_mac = (agt.indexOf("mac") != -1);
var is_gecko = (agt.indexOf("gecko") != -1);
var is_safari = (agt.indexOf("safari") != -1);

function CreateXmlHttpReq(handler) {

var xmlhttp = null;
if (is_ie) {
// Guaranteed to be ie5 or ie6
var control = (is_ie5) ? "Microsoft.XMLHTTP" : "Msxml2.XMLHTTP";

try {
xmlhttp = new ActiveXObject(control);
xmlhttp.onreadystatechange = handler;
} catch (ex) {
// TODO: better help message
alert("You need to enable active scripting and activeX controls");
}

} else {

// Mozilla
xmlhttp = new XMLHttpRequest();
xmlhttp.onload = handler;
xmlhttp.onerror = handler;

}

return xmlhttp;
}

或者

<script language="javascript">
var http_request = false;
function send_request(url) {//初始化、指定处理函数、发送请求的函数
http_request = false;
//开始初始化XMLHttpRequest对象
if(window.XMLHttpRequest) { //Mozilla 浏览器
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType) {//设置MiME类别
http_request.overrideMimeType('text/xml');
}
}
else if (window.ActiveXObject) { // IE浏览器
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
if (!http_request) { // 异常，创建对象实例失败
window.alert("不能创建XMLHttpRequest对象实例.");
return false;
}
http_request.onreadystatechange = processRequest;
// 确定发送请求的方式和URL以及是否同步执行下段代码
http_request.open("GET", url, true);
http_request.send(null);
}
// 处理返回信息的函数
function processRequest() {
if (http_request.readyState == 4) { // 判断对象状态
if (http_request.status == 200) { // 信息已经成功返回，开始处理信息
var returnObj = http_request.responseXML;
var xmlobj = http_request.responseXML;
var employees = xmlobj.getElementsByTagName("employee");
var feedbackStr = "";
for(var i=0;i<employees.length;i ) { // 循环读取employees.xml的内容
var employee = employees[i];
feedbackStr = "员工：" employee.getAttribute("name");//取得标签指定属性
feedbackStr = " 职位：" employee.getElementsByTagName("job")[0].firstChild.data;//取得指定标签的最初数据
feedbackStr = " 工资：" employee.getElementsByTagName("salary")[0].firstChild.data;
feedbackStr = "\r\n";
}
alert(feedbackStr);
} else { //页面不正常
alert("您所请求的页面有异常。");
}
}
}
</script>
http://www.cnblogs.com/skylaugh/archive/2006/11/20/566164.html