Ajax Aspx頁面請求

   function LoadImage(ElementID, id) {

            //ElementID <img>的ID

            var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");  //WebClient

            if (!xmlhttp) {

                alert("創建xmlhttp對象異常");

                return false;

            }

            var url = "GetImage.ashx?ID=" + id + "&ts" + new Date();

            xmlhttp.open("POST", "GetImage.ashx?ID=" + id + "&ts" + new Date(), false);

            xmlhttp.onreadystatechange = function event() {

                if (xmlhttp.readystate == 4) {

                    if (xmlhttp.status == 200) {

                        document.getElementById(ElementID).src = url;

                    }

                    else {

                        alert("Ajax返回Error");

                    }

                }

            }

            xmlhttp.send();

        }