csdn的注册功能的验证，用的是哪种验证方法

Question

大侠们能不能给个简单的例子啊？
CSDN注册js/jquery

Answer 1

加一个问题：他昵称的验证是用的ajax?

Answer 2

function JudgeEamil() {
            $.ajax({
                type: "GET",
                url: "AjaxEmail.aspx",
                dataType: "html",
                data: "email=" + $("#<%=username.ClientID %>").val(),
                beforeSend: function (XMLHttpRequest) {
                    $(".info:eq(0)").text("正在查询");
                    //Pause(this,100000);
                },
                success: function (msg) {
                    $(".info:eq(0)").html(msg);
                },
                complete: function (XMLHttpRequest, textStatus) {
                    //隐藏正在查询图片
                },
                error: function () {
                    //错误处理
                }
            });
        }string email = Request.QueryString["email"].ToString();
        Regex reg = new Regex(@"^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+((\.[a-zA-Z0-9_-]{2,3}){1,2})$");
        if (!reg.IsMatch(email))
        {
            Response.Write("请输入正确的邮箱！");
        }
        else
        {
            int count = TblUserInfoManager.UniqueuserName(email);
            if (count > 0)
            {
                Response.Write("此邮箱已经注册！");
            }
            else
            {
                Response.Write("OK！");
            }
        }
<asp:Button ID="BtnReg" OnClientClick="return JudgeEamil();" runat="server" CssClass="r_reg"
                        Text="同意协议并注册" OnClick="BtnReg_Click" />我应该如何才能让他返回flase;大侠们救救我吧

Answer 3

帮帮忙啊，上面少了点代码
<li><span>*我的邮箱</span>
                    <input runat="server" id="username" onblur="JudgeEamil()" type="text" /><span class="info"></span></li>