Ajax的基本格式

//javascript格式

 function btnClick() {
        var xmlHttp;
        function createXMLHttpRequst() {
            if (window.ActiveXObject) {
                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP")；
            }
            else if (window.XMLHttpRequest) {
            xmlHttp = new XMLHttpRequest();
            } 
           if (!xmlHttp) {
                alert('建立xmlHttp異常');
            }
            xmlHttp.open("POST", "GetDate.ashx", false);
            xmlHttp.onreadystatechange = function () {
                if (xmlHttp.readyState == 4) {
                    if (xmlHttp.status == 200) {
                        document.getElementById("text1").value = xmlHttp.responseText;
                    }
                    else {
                        alert('ajax伺服器返回錯誤');
                    }
                }
            };
            xmlHttp.send();
        }

//JQurery格式

    $(function () {
            $("#btnGet").click(function () {
                var sum = $("#text1").val();
                var type = $("#Select1").val();
                 var xmlHttp;
        function createXMLHttpRequst() {
            if (window.ActiveXObject) {
                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP")；
            }
            else if (window.XMLHttpRequest) {
            xmlHttp = new XMLHttpRequest();
            } 
                if (!xmlHttp) {
                    alert('建立xmlHttp對象異常');
                }
                xmlHttp.open("GET", "GetHuilv.ashx?num=" + sum + "&type=" + type, false);
                xmlHttp.onreadystatechange = function () {
                    if (xmlHttp.readyState == 4) {
                        if (xmlHttp.readystatus == 200) {
                            $("#text2").val(xmlHttp.responseText);
                        }
                        else {
                            alert('ajax伺服器返回錯誤');
                        }
                    }
                }; xmlHttp.send();          
            });
        });