WebForm页面使用Ajax

function createAjax() {
    var ajaxObject = false;
    try {
        ajaxObject = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
        try {
            ajaxObject = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e) {
            ajaxObject = false;
        }
    }
    if (!ajaxObject && typeof (XMLHttpRequest) != ‘undefinded‘) {
        ajaxObject = new XMLHttpRequest();
    }
    return ajaxObject;
}

<script type="text/javascript">
        var ajaxObject;
        window.onload = function () {
            ajaxObject = createAjax();
            getControl("btnOK").onclick = submitData1;
        }
        function submitData1() {
            var txtName = getControl("txtName").value;
            //以Post方式请求发送请求
            ajaxObject.open("POST", "ResponseEnd.aspx", true);
            //以Post方式发送异步请求需要设置请求头
            ajaxObject.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            ajaxObject.onreadystatechange = function () {
                if (ajaxObject.readyState == 4) {
                    //状态200表示异步对象已经完全接收完服务器响应的数据
                    if (ajaxObject.status == 200) {
                        var res = ajaxObject.responseText;
                        alert(res);
                    }
                }
            }
            //发送异步请求(Post方式发送请求在send里面书写自己要发送给服务器的参数)
            ajaxObject.send("flag=1&name=" + txtName);
        }
    </script>