AJAX 代码框架

<script type="text/javascript">

function btnClick()
{
var xmlhttp = new ActiveXObject("Microsoft.xmlhttp");
if(!xmlhttp)
{
alert("创建对象异常");
return false;
}

xmlhttp.open("POST", "XXXX", false);

xmlhttp.onreadystatechange = function()
{
    if (xmlhttp.readystate == 4)
if(xmlhttp.status == 200)

alert (xmlhttp.responseText);
document.getElementById("Text1").value=xmlhttp.responseText;

}

else
{
alert ("Ajax 服务器错误");

}
}
}

xmlhttp.send();

</script>