把C#对象转换为json字符串

下面的代码写在ashx一般处理程序中

声明context.Response.ContentType = "application/json";代表服务器端返回的数据为json字符串

context.Response.Write(new JavaScriptSerializer().Serialize(new { status = "OK", Msg = "正确" }));

在html页面怎么接收里？(下面是没有用jQuery的ajax)

 <script type="text/javascript">
        window.onload = function () {

            document.getElementById("btn").onclick = function () {
                alert("weqq");
                var username = document.getElementById("uname").value;
                var password = document.getElementById("pwd").value;
                var xmh = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
                xmh.open("post", "/Handler1.ashx?username=" + username + "&password=" + password, true);
                xmh.onreadystatechange = function () {
                    if (xmh.readyState == 4) {
                        if (xmh.status == 200) {
                            //var x=eval('('+xmh.responseText+')');//把json字符串转换为json对象
                                                                    //上下两种方法都行
                            var x = JSON.parse(xmh.responseText);//把json字符串转换为json对象
                            alert(x.status);
                        }
                        else {
                            alert("出错");
                        }
                    }

                };
                xmh.send();
            }
        };
    </script>