jquery validate如何提示错误

<script src="@Url.Content("~/Scripts/jquery.validate.js")"></script>

    <script type="text/javascript">

        $.extend($.validator.defaults, {

            showErrors: function (errorMap, errorList) {

                var msg = "";

             $.each(errorList, function (i, v) {

                  msg += (v.message + "\r\n");

            });

            if (msg != "")

                     alert(msg);

          }

       });

   </script>

    <script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.js")"></script>