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Der erste Parameter ist die zu sendenden Daten an den Worker. Die Daten können jedes JavaScript-Objekt sein, das durch den Structured Clone Algorithmus verarbeitet werden kann."/><meta property="og:url" content="https://developer.mozilla.org/de/docs/Web/API/Worker/postMessage"/><meta property="og:title" content="Worker: postMessage() Methode - Web APIs | MDN"/><meta property="og:type" content="website"/><meta property="og:locale" content="de"/><meta property="og:description" content="Die postMessage()-Methode des Worker-Interfaces sendet eine Nachricht an den Worker. Der erste Parameter ist die zu sendenden Daten an den Worker. 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"></span><span class="visually-hidden">Clear filter input</span></span></button></div></section></header><div class="sidebar-inner-nav"><div class="in-nav-toc"><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In diesem Artikel</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#syntax">Syntax</a></li><li class="document-toc-item "><a class="document-toc-link" href="#beispiele">Beispiele</a></li><li class="document-toc-item "><a class="document-toc-link" href="#spezifikationen">Spezifikationen</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser-kompatibilität">Browser-Kompatibilität</a></li><li class="document-toc-item "><a class="document-toc-link" href="#siehe_auch">Siehe auch</a></li></ul></section></div></div><div class="sidebar-body"><ol><li class="section"><a href="/de/docs/Web/API/Web_Workers_API">Web Workers API</a></li><li class="section"><a href="/de/docs/Web/API/Worker"><code>Worker</code></a></li><li class="toggle"><details open=""><summary>Konstruktor</summary><ol><li><a href="/de/docs/Web/API/Worker/Worker"><code>Worker()</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Instanzmethoden</summary><ol><li><em><a href="/de/docs/Web/API/Worker/postMessage" aria-current="page"><code>postMessage()</code></a></em></li><li><a href="/de/docs/Web/API/Worker/terminate"><code>terminate()</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Events</summary><ol><li><a href="/de/docs/Web/API/Worker/error_event"><code>error</code></a></li><li><a href="/de/docs/Web/API/Worker/message_event"><code>message</code></a></li><li><a href="/de/docs/Web/API/Worker/messageerror_event"><code>messageerror</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Vererbung</summary><ol><li><a href="/de/docs/Web/API/EventTarget"><code>EventTarget</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Verwandte Seiten für Web Workers API</summary><ol><li><a href="/de/docs/Web/API/DedicatedWorkerGlobalScope"><code>DedicatedWorkerGlobalScope</code></a></li><li><a href="/de/docs/Web/API/SharedWorker"><code>SharedWorker</code></a></li><li><a href="/de/docs/Web/API/SharedWorkerGlobalScope"><code>SharedWorkerGlobalScope</code></a></li><li><a href="/de/docs/Web/API/WorkerGlobalScope"><code>WorkerGlobalScope</code></a></li><li><a href="/de/docs/Web/API/WorkerLocation"><code>WorkerLocation</code></a></li><li><a href="/de/docs/Web/API/WorkerNavigator"><code>WorkerNavigator</code></a></li></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In diesem Artikel</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#syntax">Syntax</a></li><li class="document-toc-item "><a class="document-toc-link" href="#beispiele">Beispiele</a></li><li class="document-toc-item "><a class="document-toc-link" href="#spezifikationen">Spezifikationen</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser-kompatibilität">Browser-Kompatibilität</a></li><li class="document-toc-item "><a class="document-toc-link" href="#siehe_auch">Siehe auch</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="de"><header><h1>Worker: postMessage() Methode</h1><details class="baseline-indicator high"><summary><span class="indicator" role="img" aria-label="Baseline Check"></span><h2>Baseline <span class="not-bold">Widely available</span></h2><div class="browsers"><span class="engine" title="Supported in Chrome and Edge"><span class="browser chrome supported" role="img" aria-label="Chrome check"></span><span class="browser edge supported" role="img" aria-label="Edge check"></span></span><span class="engine" title="Supported in Firefox"><span class="browser firefox supported" role="img" aria-label="Firefox check"></span></span><span class="engine" title="Supported in Safari"><span class="browser safari supported" role="img" aria-label="Safari check"></span></span></div><span class="icon icon-chevron "></span></summary><div class="extra"><p>This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.</p><ul><li><a href="/de/docs/Glossary/Baseline/Compatibility" data-glean="baseline_link_learn_more" target="_blank" class="learn-more">Learn more</a></li><li><a href="#browser-kompatibilität" data-glean="baseline_link_bcd_table">See full compatibility</a></li><li><a href="https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fde%2Fdocs%2FWeb%2FAPI%2FWorker%2FpostMessage&level=high" data-glean="baseline_link_feedback" class="feedback-link" target="_blank" rel="noreferrer">Report feedback</a></li></ul></div></details></header><div class="section-content"><div class="notecard note"><p><strong>Hinweis:</strong> Diese Funktion ist in <a href="/de/docs/Web/API/Web_Workers_API">Web Workers</a> verfügbar, mit Ausnahme von <a href="/de/docs/Web/API/Service_Worker_API">Service Workers</a>.</p></div> <p>Die <strong><code>postMessage()</code></strong>-Methode des <a href="/de/docs/Web/API/Worker"><code>Worker</code></a>-Interfaces sendet eine Nachricht an den Worker. Der erste Parameter ist die zu sendenden Daten an den Worker. Die Daten können jedes JavaScript-Objekt sein, das durch den <a href="/de/docs/Web/API/Web_Workers_API/Structured_clone_algorithm">Structured Clone Algorithmus</a> verarbeitet werden kann.</p> <p>Die <a href="/de/docs/Web/API/Worker"><code>Worker</code></a> <code>postMessage()</code>-Methode delegiert an die <a href="/de/docs/Web/API/MessagePort"><code>MessagePort</code></a> <a href="/de/docs/Web/API/MessagePort/postMessage"><code>postMessage()</code></a>-Methode, die eine Aufgabe in der Ereignisschleife hinzufügt, die dem empfangenden <a href="/de/docs/Web/API/MessagePort"><code>MessagePort</code></a> entspricht.</p> <p>Der <code>Worker</code> kann Informationen zurück an den Thread senden, der ihn erzeugt hat, mithilfe der <a href="/de/docs/Web/API/DedicatedWorkerGlobalScope/postMessage"><code>DedicatedWorkerGlobalScope.postMessage</code></a>-Methode.</p></div><section aria-labelledby="syntax"><h2 id="syntax"><a href="#syntax">Syntax</a></h2><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>postMessage(message) postMessage(message, transfer) postMessage(message, options) </code></pre></div></div></section><section aria-labelledby="parameter"><h3 id="parameter"><a href="#parameter">Parameter</a></h3><div class="section-content"><dl> <dt id="message"><a href="#message"><code>message</code></a></dt> <dd> <p>Das Objekt, das an den Worker übermittelt werden soll; es wird im <code>data</code> Feld im Event erscheinen, das an das <a href="/de/docs/Web/API/DedicatedWorkerGlobalScope/message_event"><code>message</code></a> Event geliefert wird. Dies kann jeder Wert oder jedes JavaScript-Objekt sein, das durch den <a href="/de/docs/Web/API/Web_Workers_API/Structured_clone_algorithm">structured clone</a> Algorithmus verarbeitet wird, einschließlich zyklischer Referenzen.</p> <p>Der <code>message</code>-Parameter ist obligatorisch. Wenn die an den Worker zu übergebenden Daten unwichtig sind, muss <code>null</code> oder <code>undefined</code> explizit übergeben werden.</p> </dd> <dt id="transfer"><a href="#transfer"><code>transfer</code> <span class="badge inline optional">Optional</span></a></dt> <dd> <p>Ein optionales <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Array">Array</a> von <a href="/de/docs/Web/API/Web_Workers_API/Transferable_objects">übertragbaren Objekten</a>, um die Eigentümerschaft zu übertragen. Das Eigentum an diesen Objekten wird auf die Empfängerseite übertragen und sie sind auf der sendenden Seite nicht mehr nutzbar. Diese übertragbaren Objekte sollten an die Nachricht angehängt werden; andernfalls würden sie verschoben, aber auf der Empfängerseite nicht tatsächlich zugänglich sein.</p> </dd> <dt id="options"><a href="#options"><code>options</code> <span class="badge inline optional">Optional</span></a></dt> <dd> <p>Ein optionales Objekt, das die folgenden Eigenschaften enthält:</p> <dl> <dt id="transfer_2"><a href="#transfer_2"><code>transfer</code> <span class="badge inline optional">Optional</span></a></dt> <dd> <p>Hat dieselbe Bedeutung wie der <code>transfer</code>-Parameter.</p> </dd> </dl> </dd> </dl></div></section><section aria-labelledby="rückgabewert"><h3 id="rückgabewert"><a href="#rückgabewert">Rückgabewert</a></h3><div class="section-content"><p>Keiner (<a href="/de/docs/Web/JavaScript/Reference/Global_Objects/undefined"><code>undefined</code></a>).</p></div></section><section aria-labelledby="beispiele"><h2 id="beispiele"><a href="#beispiele">Beispiele</a></h2><div class="section-content"><p>Der folgende Code zeigt die Erstellung eines <a href="/de/docs/Web/API/Worker"><code>Worker</code></a>-Objekts unter Verwendung des <a href="/de/docs/Web/API/Worker/Worker"><code>Worker()</code></a>-Konstruktors. Wenn sich der Wert eines der beiden Formulareingaben (<code>first</code> und <code>second</code>) ändert, rufen <a href="/de/docs/Web/API/HTMLElement/change_event"><code>change</code></a>-Ereignisse <code>postMessage()</code> auf, um den Wert beider Eingaben an den aktuellen Worker zu senden.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const myWorker = new Worker("worker.js"); first.onchange = () => { myWorker.postMessage([first.value, second.value]); console.log("Message posted to worker"); }; second.onchange = () => { myWorker.postMessage([first.value, second.value]); console.log("Message posted to worker"); }; </code></pre></div> <p>Für ein vollständiges Beispiel siehe unser <a href="https://github.com/mdn/dom-examples/tree/main/web-workers/simple-web-worker" class="external" target="_blank">einfaches Worker-Beispiel</a> (<a href="https://mdn.github.io/dom-examples/web-workers/simple-web-worker/" class="external" target="_blank">Beispiel ausführen</a>).</p> <div class="notecard note"> <p><strong>Hinweis:</strong> <code>postMessage()</code> kann nur ein einzelnes Objekt auf einmal senden. Wie oben gezeigt, können Sie, wenn Sie mehrere Werte übergeben möchten, ein Array senden.</p> </div></div></section><section aria-labelledby="übertragungsbeispiel"><h3 id="übertragungsbeispiel"><a href="#übertragungsbeispiel">Übertragungsbeispiel</a></h3><div class="section-content"><p>Dieses minimalistische Beispiel lässt den <code>main</code> ein <code>ArrayBuffer</code> erstellen und an <code>myWorker</code> übertragen, anschließend überträgt <code>myWorker</code> es zurück an <code>main</code>, wobei die Größe bei jedem Schritt geloggt wird.</p> <h4 id="main.js_code">main.js Code</h4> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>// create worker const myWorker = new Worker("myWorker.js"); // listen for myWorker to transfer the buffer back to main myWorker.addEventListener("message", function handleMessageFromWorker(msg) { console.log("message from worker received in main:", msg); const bufTransferredBackFromWorker = msg.data; console.log( "buf.byteLength in main AFTER transfer back from worker:", bufTransferredBackFromWorker.byteLength, ); }); // create the buffer const myBuf = new ArrayBuffer(8); console.log( "buf.byteLength in main BEFORE transfer to worker:", myBuf.byteLength, ); // send myBuf to myWorker and transfer the underlying ArrayBuffer myWorker.postMessage(myBuf, [myBuf]); console.log( "buf.byteLength in main AFTER transfer to worker:", myBuf.byteLength, ); </code></pre></div> <h4 id="myworker.js_code">myWorker.js Code</h4> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>// listen for main to transfer the buffer to myWorker self.onmessage = function handleMessageFromMain(msg) { console.log("message from main received in worker:", msg); const bufTransferredFromMain = msg.data; console.log( "buf.byteLength in worker BEFORE transfer back to main:", bufTransferredFromMain.byteLength, ); // send buf back to main and transfer the underlying ArrayBuffer self.postMessage(bufTransferredFromMain, [bufTransferredFromMain]); console.log( "buf.byteLength in worker AFTER transfer back to main:", bufTransferredFromMain.byteLength, ); }; </code></pre></div> <h4 id="geloggte_ausgabe">Geloggte Ausgabe</h4> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>buf.byteLength in main BEFORE transfer to worker: 8 main.js:19 buf.byteLength in main AFTER transfer to worker: 0 main.js:27 message from main received in worker: MessageEvent { ... } myWorker.js:3 buf.byteLength in worker BEFORE transfer back to main: 8 myWorker.js:7 buf.byteLength in worker AFTER transfer back to main: 0 myWorker.js:15 message from worker received in main: MessageEvent { ... } main.js:6 buf.byteLength in main AFTER transfer back from worker: 8 main.js:10 </code></pre></div> <p><code>byteLength</code> wird nach der Übertragung des <code>ArrayBuffer</code> zu 0. Für ein anspruchsvolleres, vollständig funktionierendes Beispiel zur Übertragung von <code>ArrayBuffer</code>, schauen Sie sich dieses Firefox-Demo-Add-On an: <a href="https://github.com/Noitidart/ChromeWorker/tree/aca57d9cadc4e68af16201bdecbfb6f9a6f9ca6b" class="external" target="_blank">GitHub :: ChromeWorker - demo-transfer-arraybuffer</a></p></div></section><h2 id="spezifikationen"><a href="#spezifikationen">Spezifikationen</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://html.spec.whatwg.org/multipage/workers.html#dom-worker-postmessage-dev">HTML Standard <br/><small># dom-worker-postmessage-dev</small></a></td></tr></tbody></table><h2 id="browser-kompatibilität"><a href="#browser-kompatibilität">Browser-Kompatibilität</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. Enable JavaScript to view data.</noscript></p><section aria-labelledby="siehe_auch"><h2 id="siehe_auch"><a href="#siehe_auch">Siehe auch</a></h2><div class="section-content"><ul> <li>Das <a href="/de/docs/Web/API/Worker"><code>Worker</code></a>-Interface, zu dem es gehört.</li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" fill="#fff"><path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 32.024 11.411s17.656 14.28 23.476 23.86c5.819 9.579 9.269 20.318 10.083 31.385a69.85 69.85 0 0 1-5.387 32.44c-4.358 10.272-11.115 19.443-19.747 26.801-8.632 7.359-18.908 12.709-30.034 15.637l-6.17-21.698c7.666-2.017 14.746-5.703 20.694-10.773 5.948-5.071 10.603-11.389 13.606-18.467a48.14 48.14 0 0 0 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not-for-profit parent, the <a target="_blank" rel="noopener noreferrer" href="https://foundation.mozilla.org/">Mozilla Foundation</a>.<br/>Portions of this content are ©1998–2024 by individual mozilla.org contributors. Content available under <a href="/de/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/de/docs/Web/API/Worker/postMessage","doc":{"body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<div class=\"notecard note\"><p><strong>Hinweis:</strong> Diese Funktion ist in <a href=\"/de/docs/Web/API/Web_Workers_API\">Web Workers</a> verfügbar, mit Ausnahme von <a href=\"/de/docs/Web/API/Service_Worker_API\">Service Workers</a>.</p></div>\n<p>Die <strong><code>postMessage()</code></strong>-Methode des <a href=\"/de/docs/Web/API/Worker\"><code>Worker</code></a>-Interfaces sendet eine Nachricht an den Worker. Der erste Parameter ist die zu sendenden Daten an den Worker. Die Daten können jedes JavaScript-Objekt sein, das durch den <a href=\"/de/docs/Web/API/Web_Workers_API/Structured_clone_algorithm\">Structured Clone Algorithmus</a> verarbeitet werden kann.</p>\n<p>Die <a href=\"/de/docs/Web/API/Worker\"><code>Worker</code></a> <code>postMessage()</code>-Methode delegiert an die <a href=\"/de/docs/Web/API/MessagePort\"><code>MessagePort</code></a> <a href=\"/de/docs/Web/API/MessagePort/postMessage\"><code>postMessage()</code></a>-Methode, die eine Aufgabe in der Ereignisschleife hinzufügt, die dem empfangenden <a href=\"/de/docs/Web/API/MessagePort\"><code>MessagePort</code></a> entspricht.</p>\n<p>Der <code>Worker</code> kann Informationen zurück an den Thread senden, der ihn erzeugt hat, mithilfe der <a href=\"/de/docs/Web/API/DedicatedWorkerGlobalScope/postMessage\"><code>DedicatedWorkerGlobalScope.postMessage</code></a>-Methode.</p>"}},{"type":"prose","value":{"id":"syntax","title":"Syntax","isH3":false,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>postMessage(message)\npostMessage(message, transfer)\npostMessage(message, options)\n</code></pre></div>"}},{"type":"prose","value":{"id":"parameter","title":"Parameter","isH3":true,"content":"<dl>\n<dt id=\"message\"><a href=\"#message\"><code>message</code></a></dt>\n<dd>\n<p>Das Objekt, das an den Worker übermittelt werden soll; es wird im <code>data</code> Feld im Event erscheinen, das an das <a href=\"/de/docs/Web/API/DedicatedWorkerGlobalScope/message_event\"><code>message</code></a> Event geliefert wird. Dies kann jeder Wert oder jedes JavaScript-Objekt sein, das durch den <a href=\"/de/docs/Web/API/Web_Workers_API/Structured_clone_algorithm\">structured clone</a> Algorithmus verarbeitet wird, einschließlich zyklischer Referenzen.</p>\n<p>Der <code>message</code>-Parameter ist obligatorisch. Wenn die an den Worker zu übergebenden Daten unwichtig sind, muss <code>null</code> oder <code>undefined</code> explizit übergeben werden.</p>\n</dd>\n<dt id=\"transfer\"><a href=\"#transfer\"><code>transfer</code> <span class=\"badge inline optional\">Optional</span></a></dt>\n<dd>\n<p>Ein optionales <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Array\">Array</a> von <a href=\"/de/docs/Web/API/Web_Workers_API/Transferable_objects\">übertragbaren Objekten</a>, um die Eigentümerschaft zu übertragen. Das Eigentum an diesen Objekten wird auf die Empfängerseite übertragen und sie sind auf der sendenden Seite nicht mehr nutzbar. Diese übertragbaren Objekte sollten an die Nachricht angehängt werden; andernfalls würden sie verschoben, aber auf der Empfängerseite nicht tatsächlich zugänglich sein.</p>\n</dd>\n<dt id=\"options\"><a href=\"#options\"><code>options</code> <span class=\"badge inline optional\">Optional</span></a></dt>\n<dd>\n<p>Ein optionales Objekt, das die folgenden Eigenschaften enthält:</p>\n<dl>\n<dt id=\"transfer_2\"><a href=\"#transfer_2\"><code>transfer</code> <span class=\"badge inline optional\">Optional</span></a></dt>\n<dd>\n<p>Hat dieselbe Bedeutung wie der <code>transfer</code>-Parameter.</p>\n</dd>\n</dl>\n</dd>\n</dl>"}},{"type":"prose","value":{"id":"rückgabewert","title":"Rückgabewert","isH3":true,"content":"<p>Keiner (<a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/undefined\"><code>undefined</code></a>).</p>"}},{"type":"prose","value":{"id":"beispiele","title":"Beispiele","isH3":false,"content":"<p>Der folgende Code zeigt die Erstellung eines <a href=\"/de/docs/Web/API/Worker\"><code>Worker</code></a>-Objekts unter Verwendung des <a href=\"/de/docs/Web/API/Worker/Worker\"><code>Worker()</code></a>-Konstruktors. Wenn sich der Wert eines der beiden Formulareingaben (<code>first</code> und <code>second</code>) ändert, rufen <a href=\"/de/docs/Web/API/HTMLElement/change_event\"><code>change</code></a>-Ereignisse <code>postMessage()</code> auf, um den Wert beider Eingaben an den aktuellen Worker zu senden.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const myWorker = new Worker(\"worker.js\");\n\nfirst.onchange = () => {\n myWorker.postMessage([first.value, second.value]);\n console.log(\"Message posted to worker\");\n};\n\nsecond.onchange = () => {\n myWorker.postMessage([first.value, second.value]);\n console.log(\"Message posted to worker\");\n};\n</code></pre></div>\n<p>Für ein vollständiges Beispiel siehe unser <a href=\"https://github.com/mdn/dom-examples/tree/main/web-workers/simple-web-worker\" class=\"external\" target=\"_blank\">einfaches Worker-Beispiel</a> (<a href=\"https://mdn.github.io/dom-examples/web-workers/simple-web-worker/\" class=\"external\" target=\"_blank\">Beispiel ausführen</a>).</p>\n<div class=\"notecard note\">\n<p><strong>Hinweis:</strong> <code>postMessage()</code> kann nur ein einzelnes Objekt auf einmal senden. Wie oben gezeigt, können Sie, wenn Sie mehrere Werte übergeben möchten, ein Array senden.</p>\n</div>"}},{"type":"prose","value":{"id":"übertragungsbeispiel","title":"Übertragungsbeispiel","isH3":true,"content":"<p>Dieses minimalistische Beispiel lässt den <code>main</code> ein <code>ArrayBuffer</code> erstellen und an <code>myWorker</code> übertragen, anschließend überträgt <code>myWorker</code> es zurück an <code>main</code>, wobei die Größe bei jedem Schritt geloggt wird.</p>\n<h4 id=\"main.js_code\">main.js Code</h4>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>// create worker\nconst myWorker = new Worker(\"myWorker.js\");\n\n// listen for myWorker to transfer the buffer back to main\nmyWorker.addEventListener(\"message\", function handleMessageFromWorker(msg) {\n console.log(\"message from worker received in main:\", msg);\n\n const bufTransferredBackFromWorker = msg.data;\n\n console.log(\n \"buf.byteLength in main AFTER transfer back from worker:\",\n bufTransferredBackFromWorker.byteLength,\n );\n});\n\n// create the buffer\nconst myBuf = new ArrayBuffer(8);\n\nconsole.log(\n \"buf.byteLength in main BEFORE transfer to worker:\",\n myBuf.byteLength,\n);\n\n// send myBuf to myWorker and transfer the underlying ArrayBuffer\nmyWorker.postMessage(myBuf, [myBuf]);\n\nconsole.log(\n \"buf.byteLength in main AFTER transfer to worker:\",\n myBuf.byteLength,\n);\n</code></pre></div>\n<h4 id=\"myworker.js_code\">myWorker.js Code</h4>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>// listen for main to transfer the buffer to myWorker\nself.onmessage = function handleMessageFromMain(msg) {\n console.log(\"message from main received in worker:\", msg);\n\n const bufTransferredFromMain = msg.data;\n\n console.log(\n \"buf.byteLength in worker BEFORE transfer back to main:\",\n bufTransferredFromMain.byteLength,\n );\n\n // send buf back to main and transfer the underlying ArrayBuffer\n self.postMessage(bufTransferredFromMain, [bufTransferredFromMain]);\n\n console.log(\n \"buf.byteLength in worker AFTER transfer back to main:\",\n bufTransferredFromMain.byteLength,\n );\n};\n</code></pre></div>\n<h4 id=\"geloggte_ausgabe\">Geloggte Ausgabe</h4>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>buf.byteLength in main BEFORE transfer to worker: 8 main.js:19\nbuf.byteLength in main AFTER transfer to worker: 0 main.js:27\n\nmessage from main received in worker: MessageEvent { ... } myWorker.js:3\nbuf.byteLength in worker BEFORE transfer back to main: 8 myWorker.js:7\nbuf.byteLength in worker AFTER transfer back to main: 0 myWorker.js:15\n\nmessage from worker received in main: MessageEvent { ... } main.js:6\nbuf.byteLength in main AFTER transfer back from worker: 8 main.js:10\n</code></pre></div>\n<p><code>byteLength</code> wird nach der Übertragung des <code>ArrayBuffer</code> zu 0. Für ein anspruchsvolleres, vollständig funktionierendes Beispiel zur Übertragung von <code>ArrayBuffer</code>, schauen Sie sich dieses Firefox-Demo-Add-On an: <a href=\"https://github.com/Noitidart/ChromeWorker/tree/aca57d9cadc4e68af16201bdecbfb6f9a6f9ca6b\" class=\"external\" target=\"_blank\">GitHub :: ChromeWorker - demo-transfer-arraybuffer</a></p>"}},{"type":"specifications","value":{"id":"spezifikationen","title":"Spezifikationen","isH3":false,"specifications":[{"bcdSpecificationURL":"https://html.spec.whatwg.org/multipage/workers.html#dom-worker-postmessage-dev","title":"HTML Standard"}],"query":"api.Worker.postMessage"}},{"type":"browser_compatibility","value":{"id":"browser-kompatibilität","title":"Browser-Kompatibilität","isH3":false,"query":"api.Worker.postMessage"}},{"type":"prose","value":{"id":"siehe_auch","title":"Siehe auch","isH3":false,"content":"<ul>\n<li>Das <a href=\"/de/docs/Web/API/Worker\"><code>Worker</code></a>-Interface, zu dem es gehört.</li>\n</ul>"}}],"isActive":true,"isMarkdown":true,"isTranslated":true,"locale":"de","mdn_url":"/de/docs/Web/API/Worker/postMessage","modified":"2024-12-18T00:19:53.000Z","native":"Deutsch","noIndexing":false,"other_translations":[{"locale":"en-US","title":"Worker: postMessage() method","native":"English (US)"},{"locale":"fr","title":"Worker.postMessage()","native":"Français"},{"locale":"ja","title":"Worker.postMessage()","native":"日本語"},{"locale":"ru","title":"Worker.postMessage()","native":"Русский"},{"locale":"zh-CN","title":"Worker.postMessage()","native":"中文 (简体)"}],"pageTitle":"Worker: postMessage() Methode - Web APIs | MDN","parents":[{"uri":"/de/docs/Web","title":"Web-Technologien für Entwickler"},{"uri":"/de/docs/Web/API","title":"Web APIs"},{"uri":"/de/docs/Web/API/Worker","title":"Worker"},{"uri":"/de/docs/Web/API/Worker/postMessage","title":"postMessage()"}],"popularity":null,"short_title":"postMessage()","sidebarHTML":"<ol><li class=\"section\"><a href=\"/de/docs/Web/API/Web_Workers_API\">Web Workers API</a></li><li class=\"section\"><a href=\"/de/docs/Web/API/Worker\"><code>Worker</code></a></li><li class=\"toggle\"><details open=\"\"><summary>Konstruktor</summary><ol><li><a href=\"/de/docs/Web/API/Worker/Worker\"><code>Worker()</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Instanzmethoden</summary><ol><li><em><a href=\"/de/docs/Web/API/Worker/postMessage\" aria-current=\"page\"><code>postMessage()</code></a></em></li><li><a href=\"/de/docs/Web/API/Worker/terminate\"><code>terminate()</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Events</summary><ol><li><a href=\"/de/docs/Web/API/Worker/error_event\"><code>error</code></a></li><li><a href=\"/de/docs/Web/API/Worker/message_event\"><code>message</code></a></li><li><a href=\"/de/docs/Web/API/Worker/messageerror_event\"><code>messageerror</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Vererbung</summary><ol><li><a href=\"/de/docs/Web/API/EventTarget\"><code>EventTarget</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Verwandte Seiten für Web Workers API</summary><ol><li><a href=\"/de/docs/Web/API/DedicatedWorkerGlobalScope\"><code>DedicatedWorkerGlobalScope</code></a></li><li><a href=\"/de/docs/Web/API/SharedWorker\"><code>SharedWorker</code></a></li><li><a href=\"/de/docs/Web/API/SharedWorkerGlobalScope\"><code>SharedWorkerGlobalScope</code></a></li><li><a href=\"/de/docs/Web/API/WorkerGlobalScope\"><code>WorkerGlobalScope</code></a></li><li><a href=\"/de/docs/Web/API/WorkerLocation\"><code>WorkerLocation</code></a></li><li><a href=\"/de/docs/Web/API/WorkerNavigator\"><code>WorkerNavigator</code></a></li></ol></details></li></ol>","source":{"folder":"de/web/api/worker/postmessage","github_url":"https://github.com/mdn/translated-content-de/blob/main/files/de/web/api/worker/postmessage/index.md","last_commit_url":"https://github.com/mdn/translated-content-de/commit/2b9991a4b2b03b10b670e1969491f3fcf8bacefb","filename":"index.md"},"summary":"Die postMessage()-Methode des Worker-Interfaces sendet eine Nachricht an den Worker. Der erste Parameter ist die zu sendenden Daten an den Worker. Die Daten können jedes JavaScript-Objekt sein, das durch den Structured Clone Algorithmus verarbeitet werden kann.","title":"Worker: postMessage() Methode","toc":[{"text":"Syntax","id":"syntax"},{"text":"Beispiele","id":"beispiele"},{"text":"Spezifikationen","id":"spezifikationen"},{"text":"Browser-Kompatibilität","id":"browser-kompatibilität"},{"text":"Siehe auch","id":"siehe_auch"}],"baseline":{"baseline":"high","baseline_low_date":"2015-07-29","baseline_high_date":"2018-01-29","support":{"chrome":"2","chrome_android":"18","edge":"12","firefox":"3","firefox_android":"4","safari":"4","safari_ios":"3.2"}},"browserCompat":["api.Worker.postMessage"],"pageType":"web-api-instance-method"}}</script></body></html>