fix(StudyCoursePage): 修复滚动容器引用和滚动事件处理问题

修复滚动容器引用未正确初始化的bug
将全局滚动事件改为容器内滚动事件
优化标签切换时的滚动行为

@@ -48,7 +48,7 @@
             </div>
 
             <!-- 滚动区域：详情、目录和互动内容 -->
-            <div class="overflow-y-auto flex-1"
+            <div ref="scroll_container_ref" class="overflow-y-auto flex-1"
                 :style="{ paddingTop: topWrapperHeight, height: 'calc(100vh - ' + topWrapperHeight + ')' }">
                 <!-- 详情区域 -->
                 <div id="detail" class="py-4 px-4">
@@ -195,6 +195,9 @@ const currentTabIndex = computed(() => {
 const tabs_container_ref = ref(null);
 const tabs_container_width = ref(0);
 const tabs_resize_observer = ref(null);
+const scroll_container_ref = ref(null);
+const scroll_container_el = ref(null);
+const is_tab_scrolling = ref(false);
 
 /**
  * 初始化并监听标签容器宽度
@@ -325,8 +328,12 @@ onMounted(async () => {
     /**
      * 初始化时计算topWrapperHeight
      */
-    // 添加滚动监听
-    window.addEventListener('scroll', handleScroll);
+    nextTick(() => {
+        if (scroll_container_ref.value) {
+            scroll_container_el.value = scroll_container_ref.value;
+            scroll_container_el.value.addEventListener('scroll', handleScroll, { passive: true });
+        }
+    });
     // 添加窗口大小变化监听
     window.addEventListener('resize', updateTopWrapperHeight);
     // 确保在组件挂载后计算高度
@@ -337,7 +344,10 @@ onMounted(async () => {
 
 // 在组件卸载时移除监听器
 onUnmounted(() => {
-    window.removeEventListener('scroll', handleScroll);
+    if (scroll_container_el.value) {
+        scroll_container_el.value.removeEventListener('scroll', handleScroll);
+        scroll_container_el.value = null;
+    }
     window.removeEventListener('resize', updateTopWrapperHeight);
     // 组件卸载时取消监听
     if (resizeObserver.value) {
@@ -354,19 +364,14 @@ onUnmounted(() => {
 // 处理滚动事件
 // 在script setup中添加
 const isTabFixed = ref(false);
-const tabOriginalTop = ref(0);
 
-onMounted(async () => {
-    setTimeout(() => {
-        nextTick(() => {
-            // 记录标签页原始位置
-            const tabElement = document.querySelector('.py-3.bg-white');
-            if (tabElement) {
-                tabOriginalTop.value = tabElement.getBoundingClientRect().top + window.scrollY;
-            }
-        })
-    }, 500);
-});
+const get_container_relative_top = (el) => {
+    const container = scroll_container_ref.value;
+    if (!container || !el) return 0;
+    const container_rect = container.getBoundingClientRect();
+    const el_rect = el.getBoundingClientRect();
+    return el_rect.top - container_rect.top + container.scrollTop;
+};
 
 // 防抖函数
 const debounce = (fn, delay) => {
@@ -385,27 +390,27 @@ const debounce = (fn, delay) => {
  * 注释：当互动区域不存在时，仅在详情与目录之间联动
  */
 const handleScroll = debounce(() => {
+    if (is_tab_scrolling.value) return;
+
     const detailElement = document.getElementById('detail');
     const catalogElement = document.getElementById('catalog');
     const interactionElement = document.getElementById('interaction');
-    const tabElement = document.querySelector('.py-3.bg-white');
-    if (!detailElement || !catalogElement || !tabElement) return;
+    const container = scroll_container_ref.value;
+    if (!detailElement || !catalogElement || !container) return;
 
-    const currentScrollY = window.scrollY;
-    isTabFixed.value = currentScrollY >= tabOriginalTop.value;
+    isTabFixed.value = false;
 
-    const scrollTop = window.scrollY;
-    const tabHeight = tabElement.offsetHeight;
-    const buffer = 50; // 缓冲区域
+    const scrollTop = container.scrollTop;
+    const buffer = 20; // 缓冲区域
 
     // 计算各区域顶部位置（互动不存在则设为无穷大）
-    const detailTop = detailElement.offsetTop - tabHeight - buffer;
-    const catalogTop = catalogElement.offsetTop - tabHeight - buffer;
-    const interactionTop = interactionElement ? (interactionElement.offsetTop - tabHeight - buffer) : Infinity;
+    const detailTop = get_container_relative_top(detailElement) - buffer;
+    const catalogTop = get_container_relative_top(catalogElement) - buffer;
+    const interactionTop = interactionElement ? (get_container_relative_top(interactionElement) - buffer) : Infinity;
 
     // 页面高度与底部判断
-    const scrollHeight = document.documentElement.scrollHeight;
-    const clientHeight = document.documentElement.clientHeight;
+    const scrollHeight = container.scrollHeight;
+    const clientHeight = container.clientHeight;
     const isAtBottom = scrollTop + clientHeight >= scrollHeight - buffer;
 
     // 联动判断
@@ -434,15 +439,17 @@ const getTransitionTiming = (current, previous) => {
 const handleTabChange = (name) => {
     previousTab.value = activeTab.value;
     activeTab.value = name; // 立即更新activeTab的值
-    let offset = 100; // 调整偏移量, 配合目录的高度
+    is_tab_scrolling.value = true;
     nextTick(() => {
         const element = document.getElementById(name);
-        if (element) {
-            const topOffset = element.offsetTop - offset - parseInt(topWrapperHeight.value);
-            window.scrollTo({
-                top: topOffset,
-                behavior: 'smooth'
-            });
+        if (element && scroll_container_ref.value) {
+            const topOffset = Math.max(0, get_container_relative_top(element) - 10);
+            scroll_container_ref.value.scrollTo({ top: topOffset, behavior: 'smooth' });
+            setTimeout(() => {
+                is_tab_scrolling.value = false;
+            }, 500);
+        } else {
+            is_tab_scrolling.value = false;
         }
     });
 };