密码 必须大于六位

function Validator_CheckPassword(source, args) {
            var result = true;
            var password = $("#<%=txtPassword.ClientID %>").val();
            if ($.trim(password) != '') {
                if ($.trim(password).length < 6) {
                    result = false;
                }
            }

            args.IsValid = result;
        }

<td>
                    <asp:TextBox ID="txtPassword" runat="server" TextMode="Password" Width="160px" MaxLength="20"></asp:TextBox>
                    <asp:RequiredFieldValidator ID="rfvPassword" runat="server" ControlToValidate="txtPassword"
                        Text="*" ErrorMessage="请输入密码!" Display="None" ValidationGroup="1"></asp:RequiredFieldValidator>
                    <asp:CustomValidator ID="cvPassword" runat="server" ErrorMessage="密码长度必须控制在6-20位之间!"
                        Display="None" ValidationGroup="1" ClientValidationFunction="Validator_CheckPassword"></asp:CustomValidator>
                    <asp:HiddenField ID="hfPwd" runat="server" />
                </td>