           <tr>
                                                <td><input class="form-control form-control-user" placeholder="请输入验证码"
                                                           th:field="*{validateCode}" type="text"/></td>
                                                <td>
                                                    <img id="myCode" th:src="@{/validateCode}">
                                                </td>
                                                <td>
    