jquery validate如何提示错误

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

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

$.extend($.validator.defaults, {

            showErrors: function (errorMap, errorList) {

                var msg = "";

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

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

               });

           if (msg != "")

                   alert(msg);

            }

       });