//一個(gè)ajax的Post請(qǐng)求   

    function submitInfo() {  

        $(".warn").hide(); //剛提交的時(shí)候隱藏錯(cuò)誤的信息  

        var data = $("#formData").serialize(); //將表單的數(shù)據(jù)通過(guò)序列化表單值，創(chuàng)建 URL 編碼文本字符串。形成一個(gè)表單元素集合的 jQuery 對(duì)象 

        $.post("/login/checkLoginInfo", data, function (ajaxObj) { //將數(shù)據(jù)提交到login控制器下的CheckLOginInfo方法。參數(shù)是data。  如果請(qǐng)求成功，function就是請(qǐng)求成功時(shí)執(zhí)行的回調(diào)函數(shù)。ajaxObj是checkLoginInfo方法的返回?cái)?shù)據(jù)  

            //回傳內(nèi)容{status: 1(success)/0(fail),}  

            if (ajaxObj.status == 0 || status == null) { //如果返回狀態(tài)為0或者為null   

                $(".warn").show(); //將錯(cuò)誤信息顯示出來(lái)  

            } else {  

                //登陸成功，跳轉(zhuǎn)都制定頁(yè)面  

                window.location = '/HotelList/Index';  

            }  

        }, "json");  

}

注意這條語(yǔ)句的參數(shù)，與回調(diào)函數(shù) loginFinish 與上面條$.Post()請(qǐng)求的區(qū)別

復(fù)制代碼代碼如下:

$.post("/ajax/UserLogin.ashx",

    { "username": username, "password": password },

    loginFinish);

復(fù)制代碼代碼如下:

<html xmlns="http://www.w3.org/1999/xhtml">  

<head runat="server">  

    <title></title>  

    <link href="/css/ui-lightness/jquery-ui-1.8.2.custom.css" rel="stylesheet" type="text/css" />  

    <script src="/js/jquery-1.4.2.js" type="text/javascript"></script>  

    <script src="/js/jquery-ui-1.8.2.custom.js" type="text/javascript"></script>  

    <script type="text/javascript">  

        //向服務(wù)器請(qǐng)求當(dāng)前登錄狀態(tài)，然后切換登錄區(qū)域的顯示  

        var checkLogin = function () {  

            $.post("/ajax/CheckLogin.ashx", function (data) {  

                var strs = data.split("|");  

                if (strs[0] == "no") {  

                    //alert("木有登陸");  

                    $("#divLoginArea").show(); //如果沒(méi)有登陸就顯示"登陸"  

                    $("#divLoginOutArea").hide(); //隱藏"注銷(xiāo)"  

                }  

                else {  

                    //切換“登錄”、“注銷(xiāo)”的兩個(gè)層  

                    $("#divLoginArea").hide(); //隱藏"登陸"  

                    $("#divLoginOutArea").show(); //顯示 "注銷(xiāo)"  

                    $("#spanUserName").text(strs[1]);//把當(dāng)前登錄用戶(hù)名顯示出來(lái)  

                }  

            });  

        }  

        var loginFinish = function (data) {  //這是一個(gè)回調(diào)函數(shù)  

            if (data == "ok") {  

                //alert("成功");  

                $("#divLogin").dialog("close"); //登錄成功關(guān)閉窗口  

                checkLogin();//登錄成功，刷新登錄區(qū)域的顯示  

            }  

            else {  

                alert("用戶(hù)名密碼錯(cuò)誤");  

            }  

        };  

        $(function () {  

            $("#btnShowLoginDlg").click(function () {  

                $("#divLogin").dialog({  

                    height: 200,  

                    modal: true  

                });  

            });  

            $("#btnLogin").click(function () {  //當(dāng)用戶(hù)點(diǎn)擊"登陸" 控件觸發(fā)事件  

                //todo:檢驗(yàn)用戶(hù)名、密碼不能為空  

                var username = $("#txtUserName").val();  

                var password = $("#txtPwd").val();  

                $.post("/ajax/UserLogin.ashx",//----------------------請(qǐng)關(guān)注這條$.Post()請(qǐng)求的參數(shù)與回調(diào)函數(shù)  

                    { "username": username, "password": password },  

                    loginFinish);  

            });  

        });  

        $(function () {  

            checkLogin();//剛進(jìn)入頁(yè)面的時(shí)候也是先向服務(wù)器查詢(xún)當(dāng)前登錄狀態(tài)  

            $("#btnLogout").click(function () {  

                $.post("/ajax/Logout.ashx", function () {  

                    checkLogin();//刷新顯示  

                });  

            });  

        });  

    </script>  

    <asp:ContentPlaceHolder ID="head" runat="server">  

    </asp:ContentPlaceHolder>  

</head>  

<body>  

    <form id="form1" runat="server">  

    <div>  

        <div id="divLoginArea" style="display:none"><input type="button" value="登錄" id="btnShowLoginDlg" /></div>  

        <div id="divLoginOutArea" style="display:none">  

            <span id="spanUserName"></span>  

            <input type="button" value="注銷(xiāo)" id="btnLogout" />  

        </div>  

        <div id="divLogin" title="登錄窗口"  style="display:none">  

            <table>  

                <tr><td>用戶(hù)名：</td><td><input type="text"  id="txtUserName"/></td></tr>  

                <tr><td>密碼：</td><td><input type="password"  id="txtPwd"/></td></tr>  

                <tr><td colspan="2"><input type="button" value="登錄" id="btnLogin" /></td></tr>  

            </table>  

        </div>  

        <br />  

        <asp:ContentPlaceHolder ID="placeHolderMain" runat="server">  

        </asp:ContentPlaceHolder>  

        <br />  

         尾部<br />  

    </div>  

    </form>  

</body>  

</html>