实时趋势问题修改

src/views/govern/device/control/tabs/components/realtrend.vue

@@ -214,11 +214,12 @@ const handleClick = (tab: any, event: any) => {
 const mqttMessage: any = ref()
 const tableData: any = ref({})
 const setRealTrendData = (val: any) => {
+    mqttMessage.value={}
     if(!val){
         return
     }
     loading.value = true
-    console.log(val, '谐波频谱')
+    console.log(val, '----------------谐波频谱------------------')
     tableData.value = {}
     mqttMessage.value = val
     for (let key in val) {
@@ -229,7 +230,7 @@ const setRealTrendData = (val: any) => {
             }
         }
     }
-    if (tableData.value) {
+    if (Object.keys(tableData.value).length != 0) {
         init()
     } else {
         emit('changeTrendType', activeName.value)