NEZ-2480 fix：下拉框无内容样式问题

nezha-fronted/src/components/page/alert/alertMessage.vue

@@ -19,7 +19,7 @@
           <i class="nz-icon nz-icon-funnel"></i>
         </button>
         <pick-time v-model="searchTime" sign="message" :default-pick="10" :refresh-data-func="getTableData" :show-empty="true" :use-chart-unit="false" :use-refresh="false"></pick-time>
-        <button id="roles-add" v-has="'alertMessage_view'" :title="$t('overall.exportExcel')" class="top-tool-btn margin-r-10" type="button" @click="showExportDialog">
+        <button id="roles-add" v-has="'alertMessage_edit'" :title="$t('overall.exportExcel')" class="top-tool-btn margin-r-10" type="button" @click="showExportDialog">
           <i class="nz-icon-download1 nz-icon"></i>
         </button>
          <top-tool-more-options
@@ -31,6 +31,7 @@
           export-file-name="AlertMessage"
           class="top-tool-export margin-r-10"
           @afterImport="getTableData"
+          v-has="['alertMessage_delete','alertMessage_expired']"
         >
           <template v-slot:before>
             <div>
@@ -42,7 +43,7 @@
                   :forceDeleteShow="false"
                   :deleteTitle="'alert.alertMessage'"
                   id="alert-msg-batch-delete"
-                  v-has="'alertMessage_expired'"
+                  v-has="'alertMessage_delete'"
                   :api="url"
                   :clickFunction="batchDel"
                   :delete-objs="batchDeleteObjs"