feat: 更新视频播放器组件，添加章节视频功能并优化返回逻辑

components/nav-bar/back-events.ts

@@ -0,0 +1 @@
+export const BEFORE_NAVIGATE_BACK_EVENT = '__edu_before_navigate_back__'

components/nav-bar/nav-bar.vue

@@ -15,8 +15,9 @@
 
 <script setup>
 import { getStatusBarHeight, getTitleBarHeight, getNavBarHeight } from "@/utils/system"
+import { BEFORE_NAVIGATE_BACK_EVENT } from "./back-events"
 
-defineProps({
+const props = defineProps({
 	title:{
 		type:String,
 		default:""
@@ -24,11 +25,31 @@ defineProps({
 	leftArrow:{
 		type:Boolean,
 		default:true
+	},
+	autoBack: {
+		type: Boolean,
+		default: true
+	},
+	safeBack: {
+		type: Boolean,
+		default: false
 	}
 })
 
+const emit = defineEmits(['click-left'])
+
 const handleClickLeft = () => {
-	uni.navigateBack()
+	emit('click-left')
+	if (props.safeBack) {
+		uni.$emit(BEFORE_NAVIGATE_BACK_EVENT)
+		setTimeout(() => {
+			uni.navigateBack()
+		}, 80)
+		return
+	}
+	if (props.autoBack) {
+		uni.navigateBack()
+	}
 }
 </script>
 

components/nav-bar/use-safe-back.ts

@@ -0,0 +1,46 @@
+import { ref } from 'vue'
+import { onBackPress } from '@dcloudio/uni-app'
+
+import { BEFORE_NAVIGATE_BACK_EVENT } from './back-events'
+
+/**
+ * 安全返回组合式函数。
+ * 在页面 setup 中调用，自动注册 onBackPress 拦截。
+ * 返回前先通过事件通知所有订阅组件（如 VideoPlayer）执行清理，
+ * 延迟后再执行 navigateBack，避免 renderjs 组件销毁竞态。
+ *
+ * 用法：
+ *   const { safeNavigateBack } = useSafeBack()
+ *   // 配合 <nav-bar safe-back /> 即可，无需额外代码
+ */
+export function useSafeBack(options?: { delay?: number }) {
+  const leaving = ref(false)
+  const delay = options?.delay ?? 80
+
+  const safeNavigateBack = () => {
+    if (leaving.value) return
+    leaving.value = true
+
+    uni.$emit(BEFORE_NAVIGATE_BACK_EVENT)
+
+    setTimeout(() => {
+      uni.navigateBack()
+    }, delay)
+  }
+
+  onBackPress((event: any) => {
+    if (event?.from === 'navigateBack') {
+      return false
+    }
+    if (leaving.value) {
+      return true
+    }
+    safeNavigateBack()
+    return true
+  })
+
+  return {
+    leaving,
+    safeNavigateBack,
+  }
+}