backend requires all data to be in json string format. It used to be formatted with JSON.stringify (),.
when using the jquery-validation plug-in, the data can only be formatted with function return and cannot be formatted with JSON.stringify (). So how do you pass the json string back?

  remote: {
                    url: "rest/user/checkphone",
                    type: "POST",
                    data: {
                        "phone": function () {
                            return $("-sharptxtLoginID").val();
                        }
                    },
                    dataType: "json",
                    async: false,
                    dataFilter: function (data) {
                        if (parseInt(data.userarea.result) == 0)
                            return true;
                        else
                            return false;
                    }
                }

ask for advice. Thank you