处理联动字段，没有清空的问题

src/views/abnormalAlarm/alarmCenter/alarmRules/index.vue

@@ -468,6 +468,8 @@ export default {
       this.queryParams.type = val
       if (val) {
         this.getAlarmSources(val)
+      } else {
+        this.nameOptions=[]
       }
     },
     onStateChange(val) {
@@ -488,7 +490,12 @@ export default {
       this.form.sourceType = val
       this.form.sourceId = undefined
       this.form.itemId = undefined
+      if (val) {
         this.getSourcesOptions(val)
+        
+      } else {
+        this.sourceOptions=[]
+      }
     },
     onSourceChange(val,option) {
       this.form.sourceId = val