feat(课程页面): 添加视频播放错误处理和媒体文件预览功能

为视频播放器添加错误处理覆盖层和自动重试机制，优化视频加载配置
在课程详情页增加音频和视频播放弹窗，改进文件预览功能
根据设备类型显示不同的文件操作按钮，支持多种媒体格式预览

@@ -10,6 +10,14 @@
       @play="handlePlay"
       @pause="handlePause"
     />
+    <!-- 错误提示覆盖层 -->
+    <div v-if="showErrorOverlay" class="error-overlay">
+      <div class="error-content">
+        <div class="error-icon">⚠️</div>
+        <div class="error-message">{{ errorMessage }}</div>
+        <button @click="retryLoad" class="retry-button">重试</button>
+      </div>
+    </div>
   </div>
 </template>
 
@@ -45,20 +53,47 @@ const emit = defineEmits(["onPlay", "onPause"]);
 const videoRef = ref(null);
 const player = ref(null);
 const state = ref(null);
+const showErrorOverlay = ref(false);
+const errorMessage = ref('');
+const retryCount = ref(0);
+const maxRetries = 3;
 
 const videoOptions = computed(() => ({
   controls: true,
-  preload: "auto",
+  preload: "metadata", // 改为metadata以减少初始加载
   responsive: true,
   autoplay: props.autoplay,
   // 启用倍速播放功能
   playbackRates: [0.5, 0.75, 1, 1.25, 1.5, 2],
+  // 添加多种格式支持
   sources: [
     {
       src: props.videoUrl,
       type: "video/mp4",
     },
+    // 备用源，如果主源失败则尝试其他格式
+    {
+      src: props.videoUrl,
+      type: "video/webm",
+    },
+    {
+      src: props.videoUrl,
+      type: "video/ogg",
+    },
   ],
+  // HTML5配置优化
+  html5: {
+    vhs: {
+      overrideNative: !videojs.browser.IS_SAFARI,
+    },
+    nativeVideoTracks: false,
+    nativeAudioTracks: false,
+    nativeTextTracks: false,
+  },
+  // 错误处理配置
+  errorDisplay: true,
+  // 网络和加载配置
+  techOrder: ['html5'],
   // onPlay: () => emit("onPlay"),
   // onPause: () => emit("onPause"),
   userActions: {
@@ -81,9 +116,72 @@ const handleMounted = (payload) => {
   state.value = payload.state;
   player.value = payload.player;
   if (player.value) {
+    // 添加错误处理监听器
+    player.value.on('error', (error) => {
+      console.error('VideoJS播放错误:', error);
+      const errorCode = player.value.error();
+      if (errorCode) {
+        console.error('错误代码:', errorCode.code, '错误信息:', errorCode.message);
+        
+        // 显示用户友好的错误信息
+        showErrorOverlay.value = true;
+        
+        // 根据错误类型进行处理
+        switch (errorCode.code) {
+          case 4: // MEDIA_ERR_SRC_NOT_SUPPORTED
+            errorMessage.value = '视频格式不支持或无法加载，请检查网络连接';
+            console.warn('视频格式不支持，尝试重新加载...');
+            // 自动重试（如果重试次数未超限）
+            if (retryCount.value < maxRetries) {
+              setTimeout(() => {
+                retryLoad();
+              }, 1000);
+            }
+            break;
+          case 3: // MEDIA_ERR_DECODE
+            errorMessage.value = '视频解码失败，可能是文件损坏';
+            console.warn('视频解码错误');
+            break;
+          case 2: // MEDIA_ERR_NETWORK
+            errorMessage.value = '网络连接错误，请检查网络后重试';
+            console.warn('网络错误，尝试重新加载...');
+            if (retryCount.value < maxRetries) {
+              setTimeout(() => {
+                retryLoad();
+              }, 2000);
+            }
+            break;
+          case 1: // MEDIA_ERR_ABORTED
+            errorMessage.value = '视频加载被中止';
+            console.warn('视频加载被中止');
+            break;
+          default:
+            errorMessage.value = '视频播放出现未知错误';
+        }
+      }
+    });
+
+    // 添加加载状态监听
+    player.value.on('loadstart', () => {
+      console.log('开始加载视频');
+      showErrorOverlay.value = false; // 隐藏错误提示
+    });
+
+    player.value.on('canplay', () => {
+      console.log('视频可以播放');
+      showErrorOverlay.value = false; // 隐藏错误提示
+      retryCount.value = 0; // 重置重试计数
+    });
+
+    player.value.on('loadedmetadata', () => {
+      console.log('视频元数据加载完成');
+    });
+
     // TAG: 自动播放
     if (props.autoplay) {
-      player.value.play();
+      player.value.play().catch(error => {
+        console.warn('自动播放失败:', error);
+      });
     }
 
     // if (!wxInfo().isPc && !wxInfo().isWeiXinDesktop) { // 非PC端，且非微信PC端
@@ -125,6 +223,24 @@ const handlePause = (payload) => {
   emit("onPause", payload)
 }
 
+/**
+ * 重试加载视频
+ */
+const retryLoad = () => {
+  if (retryCount.value >= maxRetries) {
+    errorMessage.value = '重试次数已达上限，请稍后再试';
+    return;
+  }
+  
+  retryCount.value++;
+  showErrorOverlay.value = false;
+  
+  if (player.value && !player.value.isDisposed()) {
+    console.log(`第${retryCount.value}次重试加载视频`);
+    player.value.load();
+  }
+};
+
 onBeforeUnmount(() => {
   if (videoRef.value?.$player) {
     videoRef.value.$player.dispose();
@@ -133,8 +249,8 @@ onBeforeUnmount(() => {
 
 defineExpose({
   pause() {
-    if (player && typeof player?.pause === 'function') {
-      player?.pause();
+    if (player.value && typeof player.value.pause === 'function') {
+      player.value.pause();
       emit('onPause', player.value);
     }
   },
@@ -171,6 +287,52 @@ defineExpose({
   opacity: 0.6;
 }
 
+/* 错误覆盖层样式 */
+.error-overlay {
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: rgba(0, 0, 0, 0.8);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+}
+
+.error-content {
+  text-align: center;
+  color: white;
+  padding: 20px;
+}
+
+.error-icon {
+  font-size: 48px;
+  margin-bottom: 16px;
+}
+
+.error-message {
+  font-size: 16px;
+  margin-bottom: 20px;
+  line-height: 1.5;
+}
+
+.retry-button {
+  background: #007bff;
+  color: white;
+  border: none;
+  padding: 10px 20px;
+  border-radius: 4px;
+  cursor: pointer;
+  font-size: 14px;
+  transition: background-color 0.3s;
+}
+
+.retry-button:hover {
+  background: #0056b3;
+}
+
 :deep(.vjs-big-play-button) {
   display: none !important;
 }

@@ -7,7 +7,7 @@
       </div>
 
       <!-- Featured Course Banner -->
-      <div class="px-4 mb-5">
+      <div class="px-4 mb-5" v-if="bannerList.length">
         <van-swipe
           class="rounded-xl overflow-hidden shadow-lg h-40"
           :autoplay="3000"