diff --git a/src/App.vue b/src/App.vue
index 8286cc0..7be2d03 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -10,6 +10,7 @@
 import ThemePicker from "@/components/ThemePicker";
 import AlmModal from "@/components/AlmModal";
 
+let timeInterval = null;
 export default {
   name: "App",
   components: {ThemePicker, AlmModal},
@@ -47,6 +48,9 @@ export default {
     }
   },
   mounted() {
+    timeInterval = setInterval(() => {
+      this.selectOffLineDevice()
+    })
     console.log('App mounted - 初始化全局WebSocket连接')
     this.initGlobalWebSocket()
 
@@ -58,6 +62,8 @@ export default {
   beforeDestroy() {
     console.log('App beforeDestroy - 清理WebSocket连接')
     this.cleanup()
+    timeInterval && clearInterval(timeInterval)
+    timeInterval = null
   },
   methods: {
     // 初始化全局WebSocket连接
@@ -362,6 +368,7 @@ export default {
     },
     selectOffLineDevice() {
       Object.keys(this.isOnline).forEach(key => {
+          // console.log(key, new Date().getTime() - this.isOnline[key])
           if (new Date().getTime() - this.isOnline[key] > (1000 * 60 * 30)) {
             this.$confirm(`设备${key}已离线`, '设备离线', {
               cancelButtonText: '关闭',