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markdown"><h1>自定义多线程扩展</h1><p>在之前，如果想为项目编写任何的多线程代码，因为 Worker 本身的易用性差，加上平台之间实现的差异，都会非常麻烦。</p><p>为此，社区版新增了自定义多线程扩展的支持，以简化多线程代码的编写，下面以计算斐波那契数列函数为例演示如何轻松编写多线程代码。</p><h2 class="anchor anchorWithStickyNavbar_mojV" id="启用多线程扩展">启用多线程扩展<a class="hash-link" href="#启用多线程扩展" title="标题的直接链接"></a></h2><p>依次点击编辑器的菜单项 <strong>项目 - 社区版设置</strong>，然后勾选 <strong>项目多线程扩展</strong> 即可。</p><h2 class="anchor anchorWithStickyNavbar_mojV" id="创建多线程扩展">创建多线程扩展<a class="hash-link" href="#创建多线程扩展" title="标题的直接链接"></a></h2><p>依次点击编辑器的菜单项 <strong>扩展 - 创建新扩展插件... - 项目多线程扩展</strong>。</p><p>这会在项目内的 worker 目录中以默认模板创建一个多线程扩展。</p><p><img loading="lazy" alt="custom worker struct" src="/cocos-enhance-kit/assets/images/custom_worker_struct-80bd570e270783db7d11ab575cef834f.png" width="936" height="282" class="img_E7b_"></p><ul><li><code>src</code> 多线程源码目录<ul><li><code>index.js</code> 入口脚本</li><li><code>math.js</code> 含有 <code>add</code> 加法函数的示范脚本</li></ul></li><li><code>creator-worker.d.ts</code> 提供代码类型提示</li><li><code>jsconfig.json</code> JavaScript 语言服务器配置</li></ul><h2 class="anchor anchorWithStickyNavbar_mojV" id="初识多线程架构">初识多线程架构<a class="hash-link" href="#初识多线程架构" title="标题的直接链接"></a></h2><p>在编写多线程代码时，你需要时刻清楚<strong>多线程扩展内的脚本会在 Worker 线程中执行</strong>，所以不能直接导入项目内的脚本文件。</p><p>以下为 <code>math.js</code> 的内容，虽然只有几句代码，但这就已经是一个多线程函数的完整实现！</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"> registerHandler </span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">require</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">"ipc-worker.js"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword module" style="color:#00009f">export</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">add</span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter">x</span><span class="token parameter punctuation" style="color:#393A34">,</span><span class="token parameter"> y</span><span class="token parameter punctuation" style="color:#393A34">,</span><span class="token parameter"> callback</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">callback</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">x </span><span class="token operator" style="color:#393A34">+</span><span class="token plain"> y</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">registerHandler</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">"math"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> add</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>你已经可以在项目中直接调用这个函数：</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token plain">worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">math</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">add</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">[</span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter punctuation" style="color:#393A34">[</span><span class="token parameter">v</span><span class="token parameter punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:#393A34">=></span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token console class-name">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">'Worker math add result:'</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> v</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>这个函数将在 Worker 线程内执行，而不会阻塞主线程。</p><p>让我们来编写一个在 Worker 线程中计算斐波那契数列的函数，来深入了解多线程代码的编写！</p><h2 class="anchor anchorWithStickyNavbar_mojV" id="编写多线程脚本">编写多线程脚本<a class="hash-link" href="#编写多线程脚本" title="标题的直接链接"></a></h2><h3 class="anchor anchorWithStickyNavbar_mojV" id="创建脚本">创建脚本<a class="hash-link" href="#创建脚本" title="标题的直接链接"></a></h3><p>我们先在 <code>src</code> 目录创建一个 <code>fibonacci.js</code> 脚本。</p><p>然后在 <code>index.js</code> 添加新的一行来导入它：</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">require</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">"fibonacci.js"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>这样引擎在创建 Worker 时才会执行这个新脚本。</p><h3 class="anchor anchorWithStickyNavbar_mojV" id="编写函数">编写函数<a class="hash-link" href="#编写函数" title="标题的直接链接"></a></h3><p>在 <code>fibonacci.js</code> 脚本中实现计算斐波那契的函数：</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">_fibonacci</span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter">n</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">if</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">n </span><span class="token operator" style="color:#393A34"><=</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">return</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">if</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">n </span><span class="token operator" style="color:#393A34">===</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">return</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">return</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">fibonacci</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">n </span><span class="token operator" style="color:#393A34">-</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">+</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">fibonacci</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">n </span><span class="token operator" style="color:#393A34">-</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_mojV" id="导出函数到主线程">导出函数到主线程<a class="hash-link" href="#导出函数到主线程" title="标题的直接链接"></a></h3><p>现在，虽然在 Worker 线程中我们有了这个函数，但是我们无法在主线程调用它。</p><p>与 Worker 线程的通信通常使用 <code>postMessage</code> 和 <code>onMessage</code> 进行，但是需要处理很多边缘情况，而且这样的开发体验也较差，所以社区版提供了一个封装。</p><p>我们需要导入 <code>registerHandler</code> 函数：</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"> registerHandler </span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">require</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">"ipc-worker.js"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>该函数的签名是：</p><div class="language-ts codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-ts codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">export</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">registerHandler</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">name</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token builtin">string</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> handler</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> object</span><span class="token punctuation" style="color:#393A34">)</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">void</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>调用函数时，函数会执行以下操作：</p><ul><li>在全局变量 <code>worker</code> 的对象上增加一个与传入 <code>name</code> 一样的对象属性。</li><li>遍历传入 <code>handler</code> 对象上的所有属性，按规则在 <code>worker.<name></code> 对象上创建对应的函数。</li></ul><p>也就是说，我们只需要将 <code>fibonacci</code> 函数传入到 <code>registerHandler</code> 函数并调用，函数就可以在主线程中调用了！</p><p>以下是完整的 <code>fibonacci.js</code> 内容：</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"> registerHandler </span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">require</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">"ipc-worker.js"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">_fibonacci</span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter">n</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">if</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">n </span><span class="token operator" style="color:#393A34"><=</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">return</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">if</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">n </span><span class="token operator" style="color:#393A34">===</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">return</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword control-flow" style="color:#00009f">return</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">fibonacci</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">n </span><span class="token operator" style="color:#393A34">-</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">+</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">fibonacci</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">n </span><span class="token operator" style="color:#393A34">-</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">fibonacci</span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter">n</span><span class="token parameter punctuation" style="color:#393A34">,</span><span class="token parameter"> callback</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">callback</span><span class="token punctuation" style="color:#393A34">(</span><span class="token function" style="color:#d73a49">_fibonacci</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">n</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">registerHandler</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">"utils"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> fibonacci</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_mojV" id="导出的内部原理">导出的内部原理<a class="hash-link" href="#导出的内部原理" title="标题的直接链接"></a></h3><p>你可能注意到了我们导出的是另一个函数，而不是直接导出 <code>_fibonacci</code> 函数。</p><p>因为这是实现一个跨线程调用函数时需要遵循的规范：</p><ul><li>与 <code>postMessage</code> 的要求一样，函数的所有参数必须是可序列化的。</li><li>当函数被调用时，会在函数最后一个参数传入一个回调函数，当需要返回到主线程时，请调用该函数。</li></ul><p>像上面 <code>fibonacci</code> 函数的实现，在调用 <code>_fibonacci</code> 拿到计算结果后，通过调用 <code>callback(v)</code> 将值返回到主线程。</p><p>而在主线程中，我们需要像这样从主线程调用 Worker 线程中的这个函数：</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token plain">worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">utils</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">fibonacci</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">[</span><span class="token number" style="color:#36acaa">10</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter punctuation" style="color:#393A34">[</span><span class="token parameter">v</span><span class="token parameter punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:#393A34">=></span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token console class-name">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">'Worker fibonacci result:'</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> v</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>你可能注意到了，第一个参数是数组，而第二个参数的回调的第一个参数也是数组，这也是规范。</p><p>为了提高跨线程通信的性能，减少垃圾回收的频率，所以选择了这种调用的方式。</p><p>你可以这样理解 <code>worker.xxx.xxx()</code> 的调用签名：</p><div class="codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-text codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token plain">worker.utils.fibonacci(args, (values) => ...);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">// utils: 要调用的 handler 名称</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">// fibonacci: 要调用 handler 中的 Worker 函数名称</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">// args: 传入到 Worker 函数的所有参数</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">// values: Worker 函数返回时的回调，参数是返回值数组</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>这很好理解，我们再举个多参数调用的例子：</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic">// Worker 线程的函数</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">handle</span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter">a</span><span class="token parameter punctuation" style="color:#393A34">,</span><span class="token parameter"> b</span><span class="token parameter punctuation" style="color:#393A34">,</span><span class="token parameter"> c</span><span class="token parameter punctuation" style="color:#393A34">,</span><span class="token parameter"> callback</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// a = "ye.", b = {}, c = 1000</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">callback</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"text"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"> </span><span class="token literal-property property" style="color:#36acaa">prop</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// 主线程的调用方式</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">utils</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">handle</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">[</span><span class="token string" style="color:#e3116c">"ye."</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1000</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter punctuation" style="color:#393A34">[</span><span class="token parameter">v1</span><span class="token parameter punctuation" style="color:#393A34">,</span><span class="token parameter"> v2</span><span class="token parameter punctuation" style="color:#393A34">,</span><span class="token parameter"> v3</span><span class="token parameter punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:#393A34">=></span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// v1 = 1, v2 = "text", v3 = { prop: 2 }</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_mojV" id="更多导出场景">更多导出场景<a class="hash-link" href="#更多导出场景" title="标题的直接链接"></a></h3><p>无参数函数的实现与调用：</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic">// Worker 线程的函数</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">setValue</span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter">callback</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// ...</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">callback</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// 主线程的调用方式</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">utils</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">setValue</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:#393A34">=></span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// ok.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>无需返回的函数的实现与调用（这同时能节省 Worker 的通信开销，因为只需要单向通信！）：</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic">// Worker 线程的函数</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">setValue</span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter">v</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// ...</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// 执行完成之后不调用 callback，甚至不用声明</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// 主线程的调用方式</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">utils</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">setValue</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">[</span><span class="token string" style="color:#e3116c">"ye."</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>无参数也无返回的函数的实现与调用（这同时能节省 Worker 的通信开销，因为只需要单向通信！）：</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic">// Worker 线程的函数</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">setValue</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// ...</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// 执行完成之后不调用 callback，甚至不用声明</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// 主线程的调用方式</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">utils</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">setValue</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>除了函数之外，你还可以导出值、getter/setter 属性，但需要注意需通过 <code>get_xxx</code>、<code>set_xxx</code> 和 <code>write_xxx</code> 三个代理函数进行访问与修改：</p><div class="language-js codeBlockContainer_MPoW theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_B9tL"><pre tabindex="0" class="prism-code language-js codeBlock__0OG thin-scrollbar"><code class="codeBlockLines_gEuF"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic">// Worker 线程中：</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">registerHandler</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">"Date"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token literal-property property" style="color:#36acaa">time</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// 主线程中：</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// 获取值</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token known-class-name class-name">Date</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">get_time</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token parameter punctuation" style="color:#393A34">[</span><span class="token parameter">v</span><span class="token parameter punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:#393A34">=></span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// v is 1.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// 修改值，不会回调，性能比 write 更高</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token known-class-name class-name">Date</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">set_time</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">[</span><span class="token number" style="color:#36acaa">100</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// 修改值，会回调以通知操作已执行完毕</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token known-class-name class-name">Date</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">write_time</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">[</span><span class="token number" style="color:#36acaa">100</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:#393A34">=></span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// finish.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_hRr1"><button type="button" aria-label="复制代码到剪贴板" title="复制" class="clean-btn"><span class="copyButtonIcons_W9eQ" aria-hidden="true"><svg class="copyButtonIcon_XEyF" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_i9w9" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_mojV" id="编译多线程扩展">编译多线程扩展<a class="hash-link" href="#编译多线程扩展" title="标题的直接链接"></a></h2><p>每次修改扩展代码之后，需要手动点击 <strong>项目 - 重新编译多线程扩展</strong> 以生效。</p><p>特别注意：<strong>就像修改多线程的设置会影响到所有项目一样，多线程扩展的编译结果也是所有项目共用的！</strong></p><p>所以当你<strong>构建某个项目之前，必须确保最后一次编译是当前项目的多线程扩展</strong>！</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="文档分页导航"><a class="pagination-nav__link pagination-nav__link--prev" href="/cocos-enhance-kit/docs/next/user-guide/multithread/thread-ws"><div class="pagination-nav__sublabel">上一页</div><div class="pagination-nav__label">WebSocket</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/cocos-enhance-kit/docs/next/breaking-change"><div class="pagination-nav__sublabel">下一页</div><div class="pagination-nav__label">破坏性变更</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_cNA8 thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#启用多线程扩展" class="table-of-contents__link toc-highlight">启用多线程扩展</a></li><li><a href="#创建多线程扩展" class="table-of-contents__link toc-highlight">创建多线程扩展</a></li><li><a href="#初识多线程架构" class="table-of-contents__link toc-highlight">初识多线程架构</a></li><li><a href="#编写多线程脚本" class="table-of-contents__link toc-highlight">编写多线程脚本</a><ul><li><a href="#创建脚本" class="table-of-contents__link toc-highlight">创建脚本</a></li><li><a href="#编写函数" class="table-of-contents__link toc-highlight">编写函数</a></li><li><a href="#导出函数到主线程" class="table-of-contents__link toc-highlight">导出函数到主线程</a></li><li><a href="#导出的内部原理" class="table-of-contents__link toc-highlight">导出的内部原理</a></li><li><a href="#更多导出场景" class="table-of-contents__link toc-highlight">更多导出场景</a></li></ul></li><li><a href="#编译多线程扩展" class="table-of-contents__link toc-highlight">编译多线程扩展</a></li></ul></div></div></div></div></main></div></div></div>
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