feat(网络状态): 添加网络状态变化监听和错误处理

添加网络状态变化监听器以实时更新离线状态
引入错误处理机制增强网络状态检查的健壮性
在组件挂载和卸载时自动设置和移除监听器

 <!--
  * @Date: 2023-06-21 10:23:09
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2026-01-13 23:26:08
+ * @LastEditTime: 2026-01-16 00:29:52
  * @FilePath: /xyxBooking-weapp/src/pages/index/index.vue
  * @Description: 预约页首页
 -->
@@ -54,7 +54,7 @@
 <script setup>
 import Taro, { useDidShow, useShareAppMessage } from '@tarojs/taro'
 import { IconFont } from '@nutui/icons-vue-taro'
-import { ref } from 'vue'
+import { ref, onMounted, onUnmounted } from 'vue'
 import { useGo } from '@/hooks/useGo'
 import { get_network_type, is_usable_network } from '@/utils/network'
 import { weak_network_text } from '@/utils/uiText'
@@ -68,15 +68,79 @@ const go = useGo();
 const is_offline = ref(false)
 const weak_network_banner_desc = weak_network_text.banner_desc
 
+/**
+ * 刷新离线状态
+ * - 检查当前网络类型是否可用
+ * - 更新 is_offline 状态
+ */
 const refresh_offline_state = async () => {
-  const network_type = await get_network_type()
-  is_offline.value = !is_usable_network(network_type)
+  try {
+    const network_type = await get_network_type()
+    is_offline.value = !is_usable_network(network_type)
+  } catch (e) {
+    console.error('refresh_offline_state failed:', e)
+  }
+}
+
+let has_network_listener = false
+let network_listener = null
+
+/**
+ * 设置网络状态变更监听器
+ * - 监听网络状态变化
+ * - 更新 is_offline 状态
+ */
+
+const setup_network_listener = () => {
+  if (has_network_listener) return
+  has_network_listener = true
+  network_listener = (res) => {
+    try {
+      const is_connected = res?.isConnected !== false
+      const network_type = res?.networkType
+      if (typeof network_type === 'string' && network_type) {
+        is_offline.value = !(is_connected && is_usable_network(network_type))
+        return
+      }
+      // 还没有网, 再次刷新
+      refresh_offline_state()
+    } catch (e) {
+      console.error('network_listener failed:', e)
+    }
+  }
+  Taro.onNetworkStatusChange(network_listener)
+}
+
+/**
+ * 移除网络状态变更监听器
+ * - 移除网络状态变化监听
+ */
+
+const teardown_network_listener = () => {
+  if (!has_network_listener) return
+  has_network_listener = false
+  if (network_listener && typeof Taro.offNetworkStatusChange === 'function') {
+    try {
+      Taro.offNetworkStatusChange(network_listener)
+    } catch (e) {
+      console.error('offNetworkStatusChange failed:', e)
+    }
+  }
+  network_listener = null
 }
 
 useDidShow(() => {
   refresh_offline_state()
 })
 
+onMounted(() => {
+  setup_network_listener()
+})
+
+onUnmounted(() => {
+  teardown_network_listener()
+})
+
 const toBooking = () => { // 跳转到预约须知
   // 如果是离线模式，不跳转
   if (is_offline.value) {