修复多次点击保存电子围栏时会报错问题

src/views/cameras/preview/store/useFenceStore.ts

@@ -60,6 +60,7 @@ export const useFenceStore = defineStore('electronicFencePolygonStore', () => {
     }
     return saveFenceApi(param).then((res) => {
       console.log('save success', res);
+      currentFenceId.value = res;
     });
   };