   <th:block th:if="${chrtype == '1'}"><i class="fa fa-info-circle" style="color: red;"></i>  密码只能为0-9数字 </th:block>
                                <th:block th:if="${chrtype == '2'}"><i class="fa fa-info-circle" style="color: red;"></i>  密码只能为a-z和A-Z字母</th:block>
                                <th:block th:if="${chrtype == '3'}"><i class="fa fa-info-circle" style="color: red;"></i>  密码必须包含（字母，数字）</th:block>
                                <th:blo