修复讲解详情页返回按钮

src/pages/exhibit/detail.vue

@@ -400,14 +400,29 @@ const handleNavigate = async () => {
   })
 }
 
+const fallbackToExplainHome = () => {
+  uni.reLaunch({
+    url: '/pages/index/index?tab=explain'
+  })
+}
+
 const handleBack = () => {
+  if (typeof window !== 'undefined' && window.history.length > 1) {
+    const currentHref = window.location.href
+    window.history.back()
+
+    // H5 深链或异常历史栈下 history.back 可能不改变页面，兜底回到讲解首页。
+    window.setTimeout(() => {
+      if (window.location.href === currentHref) {
+        fallbackToExplainHome()
+      }
+    }, 800)
+    return
+  }
+
   uni.navigateBack({
     delta: 1,
-    fail: () => {
-      uni.reLaunch({
-        url: '/pages/index/index?tab=explain'
-      })
-    }
+    fail: fallbackToExplainHome
   })
 }
 </script>