refactor(StudyDetailPage): 重构页面布局以优化用户体验

将视频播放和标签页区域固定，滚动区域独立，提升页面交互流畅性。添加标签页切换时的平滑滚动效果，优化用户浏览体验。

@@ -4,16 +4,20 @@
 -->
 <template>
     <div class="study-detail-page bg-gradient-to-b from-green-50/70 to-white/90 min-h-screen pb-20">
-        <div v-if="course" class="flex flex-col">
+        <div v-if="course" class="flex flex-col h-screen">
+            <!-- 固定区域：视频播放和标签页 -->
+            <div class="fixed top-0 left-0 right-0 z-10 top-wrapper">
                 <!-- 视频播放区域 -->
                 <div class="w-full bg-black relative">
                     <!-- 视频封面和播放按钮 -->
                     <div v-if="!isPlaying" class="relative w-full" style="aspect-ratio: 16/9;">
                         <img :src="course.cover" :alt="course.title" class="w-full h-full object-cover" />
-                    <div class="absolute inset-0 flex items-center justify-center cursor-pointer" @click="startPlay">
+                        <div class="absolute inset-0 flex items-center justify-center cursor-pointer"
+                            @click="startPlay">
                             <div
                                 class="w-24 h-24 rounded-full bg-black/50 flex items-center justify-center hover:bg-black/70 transition-colors">
-                            <font-awesome-icon icon="circle-play" class="text-5xl text-white" style="font-size: 3rem;" />
+                                <font-awesome-icon icon="circle-play" class="text-5xl text-white"
+                                    style="font-size: 3rem;" />
                             </div>
                         </div>
                     </div>
@@ -21,25 +25,33 @@
                     <VideoPlayer v-show="isPlaying" ref="videoPlayerRef" :video-url="course.videoUrl" :autoplay="false"
                         @onPlay="handleVideoPlay" @onPause="handleVideoPause" />
                 </div>
-
                 <!-- 标签页区域 -->
-            <div class="px-4 py-3">
-                <van-tabs v-model:active="activeTab" sticky animated swipeable>
-                    <!-- 介绍标签页 -->
+                <div class="px-4 py-3 bg-white">
+                    <van-tabs v-model:active="activeTab" sticky animated swipeable shrink @change="handleTabChange">
                         <van-tab title="介绍" name="intro">
-                        <div class="py-4">
-                            <h1 class="text-xl font-bold mb-2">{{ course.title }}</h1>
-                            <div class="text-gray-500 text-sm">
-                                {{ course.studyCount || 0 }}次学习
+                        </van-tab>
+                        <van-tab :title-style="{ 'min-width': '50%' }" name="comments">
+                            <template #title>评论(999)</template>
+                        </van-tab>
+                    </van-tabs>
                 </div>
             </div>
-                    </van-tab>
 
-                    <!-- 评论标签页 -->
-                    <van-tab title="评论" :title-style="{ 'min-width': '50%' }" name="comments">
-                        <div class="py-4 space-y-4">
-                            <div v-for="comment in comments" :key="comment.id"
-                                class="bg-white rounded-lg p-4 shadow-sm">
+            <!-- 滚动区域：介绍和评论内容 -->
+            <div class="overflow-y-auto flex-1" :style="{paddingTop: topWrapperHeight, height: 'calc(100vh - ' + topWrapperHeight + ')'}">
+                <div id="intro" class="py-4 px-4">
+                    <h1 class="text-lg font-bold mb-2">{{ course.title }}</h1>
+                    <div class="text-gray-500 text-sm flex items-center gap-2">
+                        <span>{{ course.date }}</span>
+                        <span class="text-gray-300">|</span>
+                        <span>{{ course.studyCount || 0 }}次学习</span>
+                    </div>
+                </div>
+
+                <div class="h-2 bg-gray-100"></div>
+
+                <div id="comment" class="py-4 px-4 space-y-4">
+                    <div v-for="comment in comments" :key="comment.id" class="bg-white rounded-lg p-4 shadow-sm">
                         <div class="flex items-center mb-2">
                             <img :src="comment.avatar" class="w-8 h-8 rounded-full mr-2" />
                             <div>
@@ -50,8 +62,6 @@
                         <div class="text-gray-700">{{ comment.content }}</div>
                     </div>
                 </div>
-                    </van-tab>
-                </van-tabs>
             </div>
 
             <!-- 底部操作栏 -->
@@ -126,9 +136,15 @@ const comments = ref([
 // 设置页面标题
 useTitle('学习详情');
 
-// 获取课程详情
+const topWrapperHeight = ref(0);
 
 onMounted(() => {
+    nextTick(() => {
+        const topWrapper = document.querySelector('.top-wrapper');
+        if (topWrapper) {
+            topWrapperHeight.value = topWrapper.clientHeight + 'px';
+        }
+    })
     const courseId = route.params.id;
     if (courseId) {
         // TODO: 这里需要替换为实际的API调用
@@ -141,7 +157,8 @@ onMounted(() => {
             studyTime: 3600,
             type: '视频课程',
             studyCount: 1896,
-            cover: 'https://fastly.jsdelivr.net/npm/@vant/assets/cat.jpeg'
+            cover: 'https://fastly.jsdelivr.net/npm/@vant/assets/cat.jpeg',
+            date: '2024-12-04'
         };
     }
 })
@@ -160,4 +177,20 @@ const submitComment = () => {
 
     newComment.value = '';
 };
+
+// 处理标签页切换
+const handleTabChange = (name) => {
+    nextTick(() => {
+        const element = document.getElementById(name === 'intro' ? 'intro' : 'comment');
+        if (element && container) {
+            const topOffset = element.offsetTop - parseInt(topWrapperHeight.value);
+            window.scrollTo({
+                top: topOffset,
+                behavior: 'smooth'
+            });
+        }
+    })
+};
+
+
 </script>