diff --git a/src/components/HeaderVideo.vue b/src/components/HeaderVideo.vue
index 759428b..6fbbb57 100644
--- a/src/components/HeaderVideo.vue
+++ b/src/components/HeaderVideo.vue
@@ -1,149 +1,234 @@
 <script>
-import {defineComponent} from 'vue'
-import { useBootstrapBreakpoint } from './useBreakpoint.js';
-const { breakpoint } = useBootstrapBreakpoint();
+import { defineComponent } from 'vue';
+// import { useBootstrapBreakpoint } from './useBreakpoint.js'; // Kept as in original
+// const { breakpoint } = useBootstrapBreakpoint(); // Kept as in original
 
 export default defineComponent({
   name: "HeaderVideo",
   props: {
-    // 给图片设置替代文本
-    alt:         { type: String, default: '' },
-    // 帧率（帧/秒），默认 20
-    fps:         { type: Number, default: 15 },
-    // 自动播放，默认 true
-    autoplay:    { type: Boolean, default: true },
-    // 播放完毕后不循环，触发跳转逻辑
-    loop:        { type: Boolean, default: false },
-    // 帧总数，默认 115
-    framesCount: { type: Number, default: 82 },
-    // 帧图所在目录
-    basePath:    { type: String, default: '/openvideo/' }
+    alt: { type: String, default: '' },
+    fps: { type: Number, default: 15 },
+    autoplay: { type: Boolean, default: true },
+    loop: { type: Boolean, default: false },
+    framesCount: { type: Number, default: 82 }, // Max frame index, so 83 frames total (0-82)
+    basePath: { type: String, default: '/openvideo/' },
+    // New prop: Percentage of frames to load before starting playback (0.0 to 1.0)
+    playbackStartThreshold: { type: Number, default: 0.3 }
   },
   data() {
     return {
       currentFrame: 0,
       timer: null,
-      isLoading: true, // 加载状态
-      loadingProgress: 0, // 加载进度
-      preloadedImages: [] // 预加载的图片缓存
-    }
-  },
-  methods:{
-    handleVideoEnded:function (event){
-      window.location.href = "/Homepage";
-    },
-    preloadAllImages() {
-      this.isLoading = true;
-      this.loadingProgress = 0;
-
-      let loadedCount = 0;
-      const totalFrames = this.frames.length;
-
-      // 创建Promise数组
-      const preloadPromises = this.frames.map((src, index) => {
-        return new Promise((resolve, reject) => {
-          const img = new Image();
-
-          img.onload = () => {
-            this.preloadedImages[index] = img;
-            loadedCount++;
-            this.loadingProgress = Math.floor(loadedCount / totalFrames * 100);
-            resolve(img);
-          };
-
-          img.onerror = (e) => {
-            console.error(`无法加载图片: ${src}`, e);
-            loadedCount++;
-            this.loadingProgress = Math.floor(loadedCount / totalFrames * 100);
-            reject(e);
-          };
-
-          img.src = src;
-        });
-      });
-
-      // 所有帧加载完成后开始播放
-      Promise.all(preloadPromises)
-          .then(() => {
-            console.log("所有帧预加载完成");
-            this.isLoading = false;
-            this.start();
-          })
-          .catch(() => {
-            console.log("部分帧加载失败，但仍继续播放");
-            this.isLoading = false;
-            this.start();
-          });
-    },
-
-    start() {
-      if (this.timer) return;
-      const interval = 1000 / this.fps;
-
-      this.timer = setInterval(() => {
-        const next = this.currentFrame + 1;
-
-        if (next < this.frames.length) {
-          this.currentFrame = next;
-        } else {
-          this.stop();
-          setTimeout(() => {
-            window.location.href = "/Homepage";
-          }, 100);
-        }
-      }, interval);
-    },
-    stop() {
-      if (this.timer) {
-        clearInterval(this.timer)
-        this.timer = null
-      }
-    }
+      isLoading: true, // True while loading initial frames needed for playback
+      loadingProgress: 0, // Progress for loading initial frames (0-100%)
+      preloadedImages: [], // Array to store preloaded Image objects
+    };
   },
   computed: {
     frames() {
-      const arr = []
+      const arr = [];
       for (let i = 0; i <= this.framesCount; i++) {
-        // 保证五位数文件名，高位补零
-        const name = String(i).padStart(2, '0') + '.jpg'
-        arr.push(this.basePath + name)
+        const name = String(i).padStart(2, '0') + '.jpg';
+        arr.push(this.basePath + name);
+      }
+      return arr;
+    },
+    // Number of frames that need to be loaded before playback can start
+    framesNeededForPlayback() {
+      if (this.frames.length === 0) return 0;
+      // Ensure at least 1 frame is loaded if there are frames and threshold > 0
+      const calculatedFrames = Math.ceil(this.frames.length * this.playbackStartThreshold);
+      return Math.max(1, calculatedFrames);
+    },
+    // Source for the current frame image, using preloaded images
+    currentFrameSrc() {
+      if (this.preloadedImages[this.currentFrame] && this.preloadedImages[this.currentFrame].src) {
+        return this.preloadedImages[this.currentFrame].src;
+      }
+      // Fallback if the image isn't loaded (e.g., returns empty string, browser shows alt or broken icon)
+      return '';
+    }
+  },
+  methods: {
+    handleVideoEnded() { // For the <video> element, not the frame animation
+      window.location.href = "/Homepage";
+    },
+
+    initializeAndPreload() {
+      if (this.frames.length === 0) {
+        console.warn("No frames to display.");
+        this.isLoading = false;
+        return;
+      }
+
+      this.isLoading = true;
+      this.loadingProgress = 0;
+      this.preloadedImages = new Array(this.frames.length).fill(null);
+
+      const framesToLoadInitially = this.framesNeededForPlayback;
+
+      if (framesToLoadInitially === 0) {
+        console.warn("framesNeededForPlayback is 0. Starting playback immediately and loading all frames in background.");
+        this.isLoading = false;
+        if (this.autoplay) {
+          this.start();
+        }
+        this.preloadRemainingFrames(0); // Load all frames
+        return;
+      }
+
+      let initialLoadedCount = 0;
+      const initialLoadPromises = [];
+
+      for (let i = 0; i < framesToLoadInitially; i++) {
+        // Ensure we don't try to load beyond available frames if threshold is 1.0 and framesNeededForPlayback equals frames.length
+        if (i >= this.frames.length) break;
+
+        const src = this.frames[i];
+        initialLoadPromises.push(
+            new Promise((resolve) => { // No reject, always resolve to allow progress
+              const img = new Image();
+              img.onload = () => {
+                this.preloadedImages[i] = img;
+                initialLoadedCount++;
+                this.loadingProgress = Math.floor(initialLoadedCount / framesToLoadInitially * 100);
+                resolve(img);
+              };
+              img.onerror = (e) => {
+                console.error(`Error loading initial frame ${src}:`, e);
+                initialLoadedCount++; // Still count as processed for progress bar
+                this.loadingProgress = Math.floor(initialLoadedCount / framesToLoadInitially * 100);
+                resolve(null); // Resolve with null, preloadedImages[i] will remain null
+              };
+              img.src = src;
+            })
+        );
+      }
+
+      Promise.all(initialLoadPromises)
+          .then(() => {
+            console.log("Initial frames loaded, starting playback.");
+            this.isLoading = false;
+            if (this.autoplay) {
+              this.start();
+            }
+            // Start preloading the rest of the frames
+            if (framesToLoadInitially < this.frames.length) {
+              this.preloadRemainingFrames(framesToLoadInitially);
+            } else {
+              console.log("All frames were loaded in the initial batch.");
+            }
+          })
+      // .catch is not strictly needed here because individual promises always resolve
+      // If it were to catch, it would imply a fundamental issue with Promise.all itself
+      ;
+    },
+
+    preloadRemainingFrames(startIndex) {
+      if (startIndex >= this.frames.length) {
+        // This case should be handled by the caller, but good to have a guard
+        console.log("No remaining frames to preload or startIndex is out of bounds.");
+        return;
+      }
+
+      console.log(`Preloading remaining ${this.frames.length - startIndex} frames from index ${startIndex}...`);
+      for (let i = startIndex; i < this.frames.length; i++) {
+        const src = this.frames[i];
+        // Skip if already loaded (e.g. if an error occurred and this is retried, or some other logic)
+        if (this.preloadedImages[i]) continue;
+
+        const img = new Image();
+        img.onload = () => {
+          this.preloadedImages[i] = img;
+        };
+        img.onerror = (e) => {
+          console.error(`Error loading remaining frame ${src}:`, e);
+          // preloadedImages[i] will remain null for this frame
+        };
+        img.src = src;
+      }
+    },
+
+    start() {
+      if (this.timer || this.frames.length === 0) return;
+
+      // Ensure playback doesn't start if it's still in the initial loading phase
+      // (though initializeAndPreload should manage this by setting isLoading=false first)
+      if (this.isLoading) {
+        console.warn("Attempted to start playback while still in initial loading phase.");
+        return;
+      }
+
+      const interval = 1000 / this.fps;
+      this.timer = setInterval(() => {
+        const nextFrame = this.currentFrame + 1;
+
+        if (nextFrame < this.frames.length) {
+          this.currentFrame = nextFrame;
+        } else {
+          // Reached the end
+          if (!this.loop) {
+            this.stop();
+            setTimeout(() => {
+              window.location.href = "/Homepage";
+            }, 100);
+          } else {
+            this.currentFrame = 0; // Loop back
+          }
+        }
+      }, interval);
+    },
+
+    stop() {
+      if (this.timer) {
+        clearInterval(this.timer);
+        this.timer = null;
       }
-      return arr
     }
   },
   mounted() {
-    if(this.$isMobile.phone)
-    {
-      this.preloadAllImages();
-    }
-    else
-    {
+    if (this.$isMobile.phone) { // Assuming $isMobile is correctly set up
+      this.initializeAndPreload();
+    } else {
+      // Desktop/tablet uses <video> tag, existing logic
       const videos = document.querySelectorAll('.startvideo');
       if (videos.length > 0) {
         videos.forEach(video => {
           video.addEventListener('ended', this.handleVideoEnded);
-          console.log('为视频添加了 ended 事件监听器:', video);
         });
       } else {
-        console.warn("没有找到视频元素。");
+        console.warn("No video elements found for desktop/tablet.");
       }
     }
   },
   beforeUnmount() {
-    this.stop()
+    this.stop();
   },
   watch: {
-    autoplay(val) {
-      val ? this.start() : this.stop()
-    }
+    autoplay(val, oldVal) {
+      if (val === oldVal) return; // No change
+
+      if (this.$isMobile.phone) { // Only apply to frame animation
+        if (val && !this.timer && !this.isLoading) {
+          // If autoplay turned on, not already playing, and not in initial load
+          this.start();
+        } else if (!val && this.timer) {
+          // If autoplay turned off and currently playing
+          this.stop();
+        }
+      }
+    },
+    // Optional: If framesCount or basePath could change dynamically and require reloading
+    // framesCount() { this.initializeAndPreload(); },
+    // basePath() { this.initializeAndPreload(); },
   }
-})
+});
 </script>
 
 <template>
   <div id="beginroot" class="pageroot">
     <div id="videodiv">
-      <!-- 加载进度条 -->
+      <!-- Loading progress for initial frames on mobile -->
       <div v-if="$isMobile.phone && isLoading" class="loading-container">
         <div class="progress-container">
           <div class="progress-bar" :style="{width: loadingProgress + '%'}"></div>
@@ -151,13 +236,15 @@ export default defineComponent({
         <div class="loading-text">加载中 {{ loadingProgress }}%</div>
       </div>
 
+      <!-- Frame animation player for mobile, shown after initial load -->
       <img
-          :src="frames[currentFrame]"
+          v-if="$isMobile.phone && !isLoading"
+          :src="currentFrameSrc"
           id="beginwep"
           :alt="alt"
           class="simple-frame-player"
-          v-if="$isMobile.phone && !isLoading"
       />
+      <!-- Video elements for tablet/desktop (unchanged) -->
       <video v-else-if="$isMobile.tablet" poster="/logobeginPCpld.png"
              id="tbstart" muted autoplay controls="controls"
              playsinline webkit-playsinline
@@ -187,7 +274,7 @@ export default defineComponent({
 </template>
 
 <style scoped lang="scss">
-@import "src/publicstyle.scss";
+@import "src/publicstyle.scss"; // Assuming this path is correct relative to your project structure
 .loading-container {
   position: absolute;
   top: 50%;
@@ -208,7 +295,7 @@ export default defineComponent({
 .progress-bar {
   height: 100%;
   background-color: white;
-  transition: width 0.3s ease;
+  transition: width 0.3s ease; /* Smooth progress bar transition */
 }
 
 .loading-text {
@@ -220,7 +307,8 @@ export default defineComponent({
   display: flex;
   flex-direction: column;
 }
-#wepstart{
+#wepstart{ // This style block seems to target an element not in the provided template.
+  // If #beginwep is sometimes referred to as #wepstart, it's covered by #beginwep styles.
   @include media-breakpoint-between(xs, md) {
     visibility: visible;
     height: 100%!important;
@@ -232,25 +320,25 @@ export default defineComponent({
 }
 #pcstart{
   @include media-breakpoint-between(xs, md) {
-    visibility: collapse;
+    visibility: collapse; // Hidden on smaller screens where frame animation or tablet video is used
   }
   @include media-breakpoint-up(md) {
-    visibility: visible;
+    visibility: visible; // Visible on larger screens
   }
 }
 #beginbottom {
-  flex-shrink: 0; /* 添加这一行，防止此元素被压缩 */
+  flex-shrink: 0;
   a {
     text-decoration: none;
-    width: 100%; /* 确保链接占满整个宽度 */
+    width: 100%;
 
     .normalcontenttitle {
       transition: color 0.3s ease;
       color: white;
-      text-align: center; /* 文本居中 */
+      text-align: center;
       display: flex;
-      justify-content: center; /* flex布局下的水平居中 */
-      align-items: center; /* 垂直居中对齐图标 */
+      justify-content: center;
+      align-items: center;
     }
     #intoa{
       @include media-breakpoint-between(xs, md) {
@@ -271,34 +359,25 @@ export default defineComponent({
 }
 #videodiv{
   width: 100%;
-  //height: 100%;
   flex:1;
   min-height: 0;
   background-color: black;
   overflow: hidden;
-  @include media-breakpoint-between(xs, md) {
-  }
-  @include media-breakpoint-up(md) {
-  }
+  position: relative; /* Added for absolute positioning of loading-container */
 }
-.startvideo{
+.startvideo{ // Styles for <video> elements
   width: 100%;
   height: 100%;
   object-fit: cover;
 }
-#beginwep{
+#beginwep{ // Styles for the <img> frame player
   width: 100%;
   height: 100%;
   object-fit: cover;
 }
 
 #intopagesvg{
-  height: 100%;
-  width: auto;
-  max-width: 100%;
-}
-#intopagesvg {
-  height: 1em;
+  height: 1em; // Adjusted for better alignment with text
   width: auto;
   margin-left: 0.5em;
 }
@@ -309,8 +388,8 @@ export default defineComponent({
   display: flex;
   flex-direction: column;
   justify-content: center;
-  align-items: center; /* 添加这一行使内容水平居中 */
-  width: 100%; /* 确保宽度占满 */
+  align-items: center;
+  width: 100%;
   margin-left: 0!important;
   margin-bottom: 10px;
 }