docs(site): [SITE-04] cross-check existing plugin guide semantics

docs/document/plugin/vtt-thumbnail.html

@@ -9,11 +9,11 @@
     <link rel="preload stylesheet" href="/document/assets/style.BFaiTuR6.css" as="style">
     <link rel="preload stylesheet" href="/document/vp-icons.css" as="style">
     
-    <script type="module" src="/document/assets/app.B7YiEIOG.js"></script>
+    <script type="module" src="/document/assets/app.BRTGrQYq.js"></script>
     <link rel="preload" href="/document/assets/inter-roman-latin.Di8DUHzh.woff2" as="font" type="font/woff2" crossorigin="">
-    <link rel="modulepreload" href="/document/assets/chunks/theme.BM9xdY0_.js">
+    <link rel="modulepreload" href="/document/assets/chunks/theme.DdScxTso.js">
     <link rel="modulepreload" href="/document/assets/chunks/framework.xxfEszSJ.js">
-    <link rel="modulepreload" href="/document/assets/plugin_vtt-thumbnail.md.DuXsIQ27.lean.js">
+    <link rel="modulepreload" href="/document/assets/plugin_vtt-thumbnail.md.CT9mE5Lo.lean.js">
     <script src="/document/main.js"></script>
     <link rel="stylesheet" href="/document/style.css">
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@@ -41,7 +41,7 @@
 <span class="line"><span>bbb-sprite.jpg#xywh=0,0,128,72</span></span>
 <span class="line"><span></span></span>
 <span class="line"><span>00:05.000 --&gt; 00:10.000</span></span>
-<span class="line"><span>bbb-sprite.jpg#xywh=128,0,128,72</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p><code>x,y,w,h</code> 分别是图片内的左边位置、上边位置、宽度和高度，单位像素。x/y 必须非负，w/h 必须大于零，四项必须是有限数值。每条 cue 使用一行带裁剪片段的图片地址，不能直接把普通字幕文字当作缩略图索引。</p><p>相对图片地址按<strong>传入的 VTT 地址所在目录</strong>拼接：<code>/assets/sample/bbb-thumbnails.vtt</code> 中的 <code>bbb-sprite.jpg</code> 对应 <code>/assets/sample/bbb-sprite.jpg</code>。以 <code>/</code> 或已支持协议开头的完整地址直接使用。不以 HTTP 重定向后的 response URL 重新计算目录；有重定向或复杂相对路径时，建议索引使用明确的图片地址。</p><p>解析器支持 BOM、常见换行符、可选 cue 标识符和时间行设置，并跳过 NOTE、STYLE、REGION 块。它用于缩略图索引，不是完整 WebVTT 字幕排版实现。</p><h2 id="时间与显示边界" tabindex="-1">时间与显示边界 <a class="header-anchor" href="#时间与显示边界" aria-label="Permalink to &quot;时间与显示边界&quot;">​</a></h2><p>为保留旧行为，开始和结束时间向下取整到秒；区间的两端都包含在内，并选择文件顺序中第一条匹配项。例如在上面的精确 5 秒边界仍显示第一张，超过 5 秒才显示第二张。不要假设它提供毫秒级精确区间或“结束时间不包含”的字幕语义。</p><p>桌面悬停按进度条百分比乘以视频总时长选择图片；没有匹配项时隐藏，预览靠近边缘时会向内对齐。移动端使用带输入事件的进度拖动路径，并在最后一次拖动更新后约 500ms 隐藏。桌面测试不能替代真实触摸设备验收。</p><h2 id="异步注册、错误和销毁" tabindex="-1">异步注册、错误和销毁 <a class="header-anchor" href="#异步注册、错误和销毁" aria-label="Permalink to &quot;异步注册、错误和销毁&quot;">​</a></h2><p>注册会请求并解析 VTT，实际返回 Promise，成功结果只有 <code>name: &#39;artplayerPluginVttThumbnail&#39;</code>。构造器 plugins 数组中的安装是异步的，不要在构造后立即假设结果已注册。</p><p>需要明确等待和处理请求或解析失败时，可在构造播放器后调用一次 <code>art.plugins.add()</code>：</p><div class="language-ts vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Artplayer </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;artplayer&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
+<span class="line"><span>bbb-sprite.jpg#xywh=128,0,128,72</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p><code>x,y,w,h</code> 分别是图片内的左边位置、上边位置、宽度和高度，单位像素。x/y 必须非负，w/h 必须大于零，四项必须是有限数值。每条 cue 使用一行带裁剪片段的图片地址，不能直接把普通字幕文字当作缩略图索引。</p><p>相对图片地址按<strong>传入的 VTT 地址所在目录</strong>拼接：<code>/assets/sample/bbb-thumbnails.vtt</code> 中的 <code>bbb-sprite.jpg</code> 对应 <code>/assets/sample/bbb-sprite.jpg</code>。以 <code>/</code> 或已支持协议开头的完整地址直接使用。不以 HTTP 重定向后的 response URL 重新计算目录；有重定向或复杂相对路径时，建议索引使用明确的图片地址。</p><p>解析器支持 BOM、常见换行符、可选 cue 标识符和时间行设置，并跳过 NOTE、STYLE、REGION 块。它用于缩略图索引，不是完整 WebVTT 字幕排版实现。</p><h2 id="时间与显示边界" tabindex="-1">时间与显示边界 <a class="header-anchor" href="#时间与显示边界" aria-label="Permalink to &quot;时间与显示边界&quot;">​</a></h2><p>为保留旧行为，开始和结束时间向下取整到秒；区间的两端都包含在内，并选择文件顺序中第一条匹配项。例如在上面的精确 5 秒边界仍显示第一张，超过 5 秒才显示第二张。不要假设它提供毫秒级精确区间或“结束时间不包含”的字幕语义。</p><p>桌面悬停按进度条百分比乘以视频总时长选择图片；没有匹配项时隐藏，预览靠近边缘时会向内对齐。移动端使用带输入事件的进度拖动路径，并在最后一次拖动更新后约 500ms 隐藏。桌面测试不能替代真实触摸设备验收。</p><p>绘制位置必须严格位于进度条内部。桌面进度恰好为 0 或 1 时隐藏预览；移动端这两个端点不会绘制新预览，但已有预览仍按计时器隐藏。插件使用控件名 <code>vtt-thumbnail</code> 和样式类 <code>art-control-thumbnails</code>，请保留这些既有挂钩。</p><h2 id="异步注册、错误和销毁" tabindex="-1">异步注册、错误和销毁 <a class="header-anchor" href="#异步注册、错误和销毁" aria-label="Permalink to &quot;异步注册、错误和销毁&quot;">​</a></h2><p>注册会请求并解析 VTT，实际返回 Promise，成功结果只有 <code>name: &#39;artplayerPluginVttThumbnail&#39;</code>。构造器 plugins 数组中的安装是异步的，不要在构造后立即假设结果已注册。</p><p>需要明确等待和处理请求或解析失败时，可在构造播放器后调用一次 <code>art.plugins.add()</code>：</p><div class="language-ts vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Artplayer </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;artplayer&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
 <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> thumbnails </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;artplayer-plugin-vtt-thumbnail/runtime&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
 <span class="line"></span>
 <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> art</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> Artplayer</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">({</span></span>
@@ -59,7 +59,7 @@
 <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">    }</span></span>
 <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>
 <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">void</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> installThumbnails</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">();</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br></div></div><p>请求失败或格式错误会拒绝注册，格式错误包含行号。注册完成只说明 VTT 已加载解析并创建控件，不表示所有图片已解码；图片在浏览器显示时加载，图片请求失败不会变成已经完成的注册 Promise 的拒绝。</p><p>插件没有 update、reload 或独立 destroy 方法。切换主视频不会自动重新请求 VTT；切换到另一套视频和缩略图时，可销毁并重建播放器。不要把 <code>controls.remove()</code> 当作完整卸载，也不要用重复安装模拟一个没有提供的更新接口。</p><p>销毁播放器会取消待处理请求（环境支持 AbortController 时），结算取消的注册、移除自己的监听器和计时器，并移除仍由本次安装持有的控件。取消结算仍返回名称对象，因此名称本身不是图片可用的证明。迟到请求不会重新挂载界面。</p><h2 id="typescript-兼容" tabindex="-1">TypeScript 兼容 <a class="header-anchor" href="#typescript-兼容" aria-label="Permalink to &quot;TypeScript 兼容&quot;">​</a></h2><p>根入口和 <code>/legacy</code> 保留最新已发布 1.1.0 的旧同步返回类型与函数替换形状，实际注册始终是异步的。上面的 <code>/runtime</code> 使用相同 JavaScript 实现，准确声明 Promise 和运行时 <code>.default</code> 自引用别名，并提供 <code>Option</code>、<code>Result</code>、<code>Factory</code>、<code>RuntimeFactory</code> 类型。</p><p>1.0.x 的旧 <code>export =</code> 与 1.1.0 的默认导出声明无法同时保持相同类型提取。依赖较早 CommonJS 声明的 TypeScript 代码应迁移到 <code>/runtime</code>；NodeNext ESM 消费者也优先使用此入口，避免根入口保留的历史命名空间形状。合法旧 JavaScript 调用和历史文件入口继续保留。</p><p>浏览器验证覆盖新旧核心的进度条裁剪和清理；完整移动端、插件组合与发布产物验收仍以项目记录为准。</p></div></div></main><footer class="VPDocFooter" data-v-ef3a4dda data-v-07d71ff1><!--[--><!--]--><div class="edit-info" data-v-07d71ff1><div class="edit-link" data-v-07d71ff1><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/zhw2590582/ArtPlayer/tree/master/packages/artplayer-vitepress/docs/plugin/vtt-thumbnail.md" target="_blank" rel="noreferrer" data-v-07d71ff1><!--[--><span class="vpi-square-pen edit-link-icon" data-v-07d71ff1></span> Edit this page on GitHub<!--]--></a></div><div class="last-updated" data-v-07d71ff1><p class="VPLastUpdated" data-v-07d71ff1 data-v-e95db471>Last updated: <time datetime="2026-09-15T18:30:01.000Z" data-v-e95db471></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-07d71ff1><span class="visually-hidden" id="doc-footer-aria-label" data-v-07d71ff1>Pager</span><div class="pager" data-v-07d71ff1><a class="VPLink link pager-link prev" href="/document/plugin/dash-control.html" data-v-07d71ff1><!--[--><span class="desc" data-v-07d71ff1>Previous page</span><span class="title" data-v-07d71ff1>DASH 控制</span><!--]--></a></div><div class="pager" data-v-07d71ff1><a class="VPLink link pager-link next" href="/document/plugin/auto-thumbnail.html" data-v-07d71ff1><!--[--><span class="desc" data-v-07d71ff1>Next page</span><span class="title" data-v-07d71ff1>自动缩略图</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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