优化首页加载页静默降级体验

src/pages/index/index.vue

@@ -382,6 +382,7 @@ const topTabFromHash = () => {
 const launchOverlayMinDisplayMs = 700
 const launchOverlayGuideTimeoutMs = 12000
 const launchOverlayNonGuideTimeoutMs = 900
+const launchOverlayDefaultText = '正在进入自然导览'
 
 const shouldShowLaunchOverlay = () => {
   if (typeof window === 'undefined') return false
@@ -407,7 +408,7 @@ const currentTab = ref<GuideTopTab>(initialTopTab())
 const launchOverlayVisible = ref(shouldShowLaunchOverlay())
 const launchOverlayLeaving = ref(false)
 const launchProgress = ref(8)
-const launchLoadingText = ref('正在初始化三维场景')
+const launchLoadingText = ref(launchOverlayDefaultText)
 const launchInitialModelSettled = ref(false)
 const launchOverlayRecoverable = ref(false)
 const launchImageLoaded = ref(false)
@@ -499,6 +500,26 @@ const shouldWaitForLaunchModel = () => (
   && is3DMode.value
 )
 
+const continueLaunchWithoutInitialModel = (reason: string, event?: { view: GuideIndoorView; floorId?: string; message?: string; elapsedMs?: number }) => {
+  if (!launchOverlayVisible.value || launchOverlayLeaving.value) return
+
+  console.warn('首页前置加载页未等待初始三维模型，已进入馆外导览:', {
+    reason,
+    event
+  })
+
+  launchInitialModelSettled.value = true
+  launchOverlayRecoverable.value = false
+  launchLoadingText.value = launchOverlayDefaultText
+  launchProgress.value = Math.max(launchProgress.value, 96)
+  is3DMode.value = false
+  guideOutdoorState.value = 'home'
+  selectedGuidePoi.value = null
+  isPoiCardCollapsed.value = false
+  isSimulatingRoute.value = false
+  hideLaunchOverlay()
+}
+
 const startLaunchOverlay = () => {
   if (!launchOverlayVisible.value) return
 
@@ -507,9 +528,7 @@ const startLaunchOverlay = () => {
   launchOverlayRecoverable.value = false
   launchOverlayStartedAt = Date.now()
   launchProgress.value = shouldWaitForLaunchModel() ? 8 : 68
-  launchLoadingText.value = shouldWaitForLaunchModel()
-    ? '正在初始化三维场景'
-    : '正在进入自然导览'
+  launchLoadingText.value = launchOverlayDefaultText
 
   const timeoutMs = shouldWaitForLaunchModel()
     ? launchOverlayGuideTimeoutMs
@@ -517,10 +536,7 @@ const startLaunchOverlay = () => {
 
   launchOverlayFallbackTimer = setTimeout(() => {
     if (shouldWaitForLaunchModel() && !launchInitialModelSettled.value) {
-      launchOverlayRecoverable.value = true
-      launchProgress.value = Math.min(96, Math.max(launchProgress.value, 92))
-      launchLoadingText.value = '三维场景加载较慢，仍在等待模型就绪'
-      console.warn(`首页前置加载页等待模型超过 ${timeoutMs}ms，继续等待真实模型 ready`)
+      continueLaunchWithoutInitialModel('timeout')
       return
     }
     hideLaunchOverlay()
@@ -532,7 +548,7 @@ const handleInitialModelProgress = (event: { progress: number; message: string;
 
   launchOverlayRecoverable.value = false
   launchProgress.value = Math.min(99, Math.max(8, event.progress))
-  launchLoadingText.value = event.message || '正在加载三维场景'
+  launchLoadingText.value = launchOverlayDefaultText
 }
 
 const settleLaunchOverlayByModel = (status: 'ready' | 'failed', event?: { view: GuideIndoorView; floorId?: string; message?: string; elapsedMs?: number }) => {
@@ -540,13 +556,11 @@ const settleLaunchOverlayByModel = (status: 'ready' | 'failed', event?: { view:
   launchOverlayRecoverable.value = status === 'failed'
 
   if (status === 'failed') {
-    launchProgress.value = Math.min(launchProgress.value, 96)
-    launchLoadingText.value = event?.message || '三维场景加载失败'
-    console.warn('首页前置加载页收到初始模型加载失败，等待用户选择重试或进入降级首页:', event)
+    continueLaunchWithoutInitialModel('failed', event)
     return
   } else {
     launchProgress.value = 100
-    launchLoadingText.value = '三维场景已就绪'
+    launchLoadingText.value = launchOverlayDefaultText
     console.log('首页前置加载页收到初始模型加载完成:', event)
   }
 
@@ -571,6 +585,10 @@ const handleLaunchImageError = () => {
 
 const handleLaunchContinue = () => {
   launchOverlayRecoverable.value = false
+  if (shouldWaitForLaunchModel() && !launchInitialModelSettled.value) {
+    continueLaunchWithoutInitialModel('manual')
+    return
+  }
   hideLaunchOverlay()
 }