perf: 优化代码分割与懒加载以提升应用性能

- 将 PdfViewer 和 VideoPlayer 组件改为异步加载，减少初始包体积
- 为视频播放器相关依赖添加动态导入，避免未使用时加载
- 在打包配置中添加手动分包策略，将 vue-office 和图像工具库分离为独立 chunk
- 优化 Safari 浏览器检测逻辑，避免直接导入 video.js 以支持懒加载

@@ -116,8 +116,9 @@
 </template>
 
 <script setup>
-import { ref, watch, nextTick, onUnmounted } from 'vue';
-import PDF from "pdf-vue3";
+import { defineAsyncComponent, ref, watch, nextTick, onUnmounted } from 'vue';
+
+const PDF = defineAsyncComponent(() => import("pdf-vue3"));
 
 /**
  * 组件属性定义

@@ -62,11 +62,18 @@
 </template>
 
 <script setup>
-import { ref } from "vue";
-import { VideoPlayer } from "@videojs-player/vue";
-import "video.js/dist/video-js.css";
+import { defineAsyncComponent, ref } from "vue";
 import { useVideoPlayer } from "@/composables/useVideoPlayer";
 
+const VideoPlayer = defineAsyncComponent(async () => {
+  await import("video.js/dist/video-js.css");
+  await import("videojs-hls-quality-selector/dist/videojs-hls-quality-selector.css");
+  await import("videojs-contrib-quality-levels");
+  await import("videojs-hls-quality-selector");
+  const mod = await import("@videojs-player/vue");
+  return mod.VideoPlayer;
+});
+
 const props = defineProps({
   options: {
     type: Object,

 import { ref, computed, watch, onMounted, onBeforeUnmount } from 'vue';
 import { wxInfo } from "@/utils/tools";
-import videojs from "video.js";
 import { buildVideoSources, canPlayHlsNatively } from "./videoPlayerSource";
 import { useVideoProbe } from "./useVideoProbe";
 import { useVideoPlaybackOverlays } from "./useVideoPlaybackOverlays";
-// 新增：引入多码率切换插件
-import 'videojs-contrib-quality-levels'; // 用于读取 m3u8 中的多码率信息
-import 'videojs-hls-quality-selector'; // 用于在播放器控制条显示“清晰度”切换菜单（支持 Auto/720p/480p 等）。
-import 'videojs-hls-quality-selector/dist/videojs-hls-quality-selector.css';
+
+const is_safari_browser = () => {
+  if (typeof navigator === 'undefined') return false;
+  const ua = navigator.userAgent || '';
+  const is_safari = /safari/i.test(ua) && !/chrome|crios|android|fxios|edg/i.test(ua);
+  return is_safari;
+};
 
 /**
  * - 使用方法 ：您无需修改业务代码。只要传入的视频 URL 是七牛云生成的多码率 .m3u8 地址，播放器控制条右下角会自动出现“齿轮”图标，用户点击即可切换清晰度（或选择 Auto 自动切换）。
@@ -271,7 +273,7 @@ export function useVideoPlayer(props, emit, videoRef, nativeVideoRef) {
   // 5. Video.js 播放器逻辑 (PC/Android)
   const shouldOverrideNativeHls = computed(() => {
     if (!isM3U8.value) return false;
-    if (videojs.browser.IS_SAFARI) return false;
+    if (is_safari_browser()) return false;
     // 非 Safari 且不具备原生 HLS 时，强制 video.js 的 VHS 来解 m3u8
     return !canPlayHlsNatively();
   });

 <!--
  * @Date: 2025-10-22 10:45:51
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-10-22 10:54:10
+ * @LastEditTime: 2026-01-24 14:00:37
  * @FilePath: /mlaj/src/views/study/PdfPreviewPage.vue
- * @Description: 文件描述
+ * @Description: PDF预览页
 -->
 <template>
   <div class="pdf-preview-page">
@@ -12,9 +12,10 @@
 </template>
 
 <script setup>
-import { computed, onMounted, onBeforeUnmount } from 'vue'
+import { computed, defineAsyncComponent, onMounted, onBeforeUnmount } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
-import PdfViewer from '@/components/media/PdfViewer.vue'
+
+const PdfViewer = defineAsyncComponent(() => import('@/components/media/PdfViewer.vue'))
 
 const route = useRoute()
 const router = useRouter()
@@ -37,7 +38,7 @@ const pdfTitle = computed(() => {
 const handleClose = () => {
   // 清除刷新标记
   sessionStorage.removeItem('pdf-preview-refreshed')
-  
+
   const returnId = route.query.returnId
   const openMaterials = route.query.openMaterials
   if (returnId) {

 /*
  * @Date: 2025-03-20 19:53:12
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2026-01-18 23:17:57
+ * @LastEditTime: 2026-01-24 13:56:05
  * @FilePath: /mlaj/vite.config.js
  * @Description: 文件描述
  */
@@ -111,6 +111,11 @@ export default ({ mode }) => {
           chunkFileNames: 'static/js/[name]-[hash].js',
           entryFileNames: 'static/js/[name]-[hash].js',
           assetFileNames: 'static/[ext]/[name]-[hash].[ext]',
+          manualChunks: (id) => {
+            if (!id.includes('node_modules')) return;
+            if (id.includes('@vue-office/docx') || id.includes('@vue-office/excel') || id.includes('@vue-office/pptx')) return 'vue-office';
+            if (id.includes('html2canvas') || id.includes('html-to-image')) return 'image-tools';
+          },
         },
         input: { // 多页面应用模式, 打包时配置，运行配置要处理root
           main: path.resolve(__dirname, 'index.html'),