JQuery .ajax .post .get 应用

.ajax

前台代码：

    <script type="text/javascript">
        $(function () {
            $("a").click(function () {
                switch (this.id) {
                    case "login":
                        $.ajax({
                            type: "POST",
                            url: "sqb_mweb_login.aspx/login",
                            data: { mode: "chkuser", username: $("#username").val(), password: $("#password").val() },
                            success: function (result) {
                                if (result == "true") {
                                    var expDays = 30; //此 cookie 将被保存 30 天
                                    var expDate = new Date(); //new Date("December 31, 9998");
                                    expDate.setTime(expDate.getTime() + expDays * 24 * 60 * 60 * 1000);
                                    document.cookie = "SqbMwebUserName" + "=" + escape($("#username").val()) + ";expires=" + expDate.toGMTString();
                                    location.href = "sqb_mweb_main.aspx";
                                }
                                else {
                                    alert("用户名或密码错误！");
                                }
                            },
                            error: function (XMLHttpRequest, textStatus, errorThrown) { alert(errorThrown); }
                        });
                        break
                    case "reback":
                        $("#username").val("");
                        $("#password").val("");
                        break
                }
            })
        })
    </script>

后台代码：

        protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.Form["mode"] == "chkuser") //如果是ajax请求，则执行login方法
            {
                login(Request.Form["username"].ToString(), Request.Form["password"].ToString());
            }
        }

        public void login(string UserName, string PassWord)
        {
            SqlQuery SqlQuery = new SqlQuery();
            DataTable MyTable = new DataTable();
            String selectstring = "select * from sqb_users where UserName= '" + UserName + "' and PassWord='" + PassWord + "'";
            MyTable = SqlQuery.GetDataTable(selectstring);

            if (MyTable.Rows.Count > 0)
            {
                HttpContext.Current.Session["SqbMwebUserName"] = UserName; //添加Session
                HttpContext.Current.Session.Timeout = 60;
                Response.Write("true");
            }
            else
            {
                Response.Write("false");
            }

            Response.End();//停止其他输出
        }