style：设备-任务管理-cron表达式为空不允许启用任务

src/views/mes/taskManagement/index.vue

@@ -82,6 +82,7 @@
         <template #default="scope">
           <el-switch
             :model-value="scope.row.enabled === true || scope.row.enabled === 'true'"
+            :before-change="() => handleBeforeEnabledChange(scope.row)"
             @change="(val) => handleEnabledChange(scope.row, val)"
           />
         </template>
@@ -126,6 +127,7 @@
 </template>
 
 <script setup lang="ts">
+import { ElMessageBox } from 'element-plus'
 import { DICT_TYPE } from '@/utils/dict'
 import { dateFormatter, dateFormatter2 } from '@/utils/formatTime'
 import download from '@/utils/download'
@@ -247,6 +249,20 @@ const handleCreateTicket = async (id?: number) => {
   }
 }
 
+const handleBeforeEnabledChange = async (row: TaskManagementVO) => {
+  const isEnabled = row.enabled === true || row.enabled === 'true'
+  if (isEnabled) return true
+  const cronExpression = (row as any)?.cronExpression
+  if (typeof cronExpression === 'string' && cronExpression.trim()) return true
+  await ElMessageBox.alert('请先填写 cron 表达式，再启用任务', '提示', {
+    type: 'warning',
+    confirmButtonText: '我知道了',
+    closeOnClickModal: false,
+    closeOnPressEscape: false
+  })
+  return false
+}
+
 const handleEnabledChange = async (row: TaskManagementVO, value: boolean) => {
   if (!row.id) return
   const oldEnabled = row.enabled