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+---
+title: Worker
+slug: Web/API/Worker
+translation_of: Web/API/Worker
+---
+<p>{{APIRef("Web Workers API")}}</p>
+
+<p>A interface do <em><strong><code>Worker</code></strong> </em>da <a href="/en-US/docs/Web/API/Web_Workers_API">API de Workers da Web </a>representa uma tarefa em segundo palno que pode ser criada facilmente e pode enviar mensagens de volta para o seu criador. Criar um <em>worker </em>é tão simples como chamar o criador de <code>Worker()</code> e especificar um script para ser executado na sequência do <em>worker</em>.</p>
+
+<p>Os <em>workers</em> podem, por sua vez, gerar novos <em>workers</em> enquanto esses <em>workers</em> estiverem alojados dentro da mesma <a href="/en-US/docs/Web/Security/Same-origin_policy">origem</a> como a página original (Nota: os <em>workers</em> integrados <a href="https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/5R3B4RN4GHU">não estão atualmente implementados no Blink</a>).  Em adição os <em>workers</em> poderão utilizar <a class="internal" href="/en/DOM/XMLHttpRequest" title="En/XMLHttpRequest"><code>XMLHttpRequest</code></a> para I/O rede, com a estipulação que a <code>responseXML</code> e os atributos <code>channel</code> no <code>XMLHttpRequest</code> retornam sempre <code>null</code>.</p>
+
+<p><a href="/En/DOM/Worker/Functions_available_to_workers" title="En/DOM/Worker/Functions available to workers">Nem todas as interfaces e funções estão disposníveis</a> para o <em>script</em> associado com um <em><code>Worker</code></em>.</p>
+
+<p>No Firefox, se quiser utilziar os <em>workers</em> nas extensões e pretender ter acesso a <a href="/en/js-ctypes" title="en/js-ctypes">js-ctypes</a>, então deverá utilizar o objeto {{ domxref("ChromeWorker") }}.</p>
+
+<h2 id="Criadores">Criadores</h2>
+
+<dl>
+ <dt>{{domxref("Worker.Worker", "Worker()")}}</dt>
+ <dd>Creates a dedicated web worker that executes the script at the specified URL. Workers can also be constructed using <a href="/en-US/docs/Web/API/Blob">Blobs</a>.</dd>
+</dl>
+
+<h2 id="Propriedades">Propriedades</h2>
+
+<p><em>Inherits properties from its parent, {{domxref("EventTarget")}}, and implements properties from {{domxref("AbstractWorker")}}.</em></p>
+
+<h3 id="Manipuladores_de_evento">Manipuladores de evento</h3>
+
+<dl>
+ <dt>{{domxref("AbstractWorker.onerror")}}</dt>
+ <dd>An {{ domxref("EventListener") }} called whenever an {{domxref("ErrorEvent")}} of type <code>error</code> bubbles through to the worker. This is inherited from {{domxref("AbstractWorker")}}.</dd>
+ <dt>{{domxref("Worker.onmessage")}}</dt>
+ <dd>An {{ domxref("EventListener") }} called whenever a {{domxref("MessageEvent")}} of type <code>message</code> bubbles through the worker — i.e. when a message is sent to the parent document from the worker via {{domxref("DedicatedWorkerGlobalScope.postMessage")}}. The message is stored in the event's {{domxref("MessageEvent.data", "data")}} property.</dd>
+ <dt>{{domxref("Worker.onmessageerror")}}</dt>
+ <dd>Is an {{domxref("EventHandler")}} representing the code to be called when the {{event("messageerror")}} event is raised.</dd>
+</dl>
+
+<dl>
+</dl>
+
+<h2 id="Métodos">Métodos</h2>
+
+<p><em>Inherits methods from its parent, {{domxref("EventTarget")}}, and implements methods from {{domxref("AbstractWorker")}}.</em></p>
+
+<dl>
+ <dt>{{domxref("Worker.postMessage()")}}</dt>
+ <dd>Sends a message — which can consist of <code>any</code> JavaScript object — to the worker's inner scope.</dd>
+ <dt>{{domxref("Worker.terminate()")}}</dt>
+ <dd>Immediately terminates the worker. This does not offer the worker an opportunity to finish its operations; it is simply stopped at once. ServiceWorker instances do not support this method.</dd>
+</dl>
+
+<h2 id="Exemplo">Exemplo</h2>
+
+<p>The following code snippet shows creation of a {{domxref("Worker")}} object using the {{domxref("Worker.Worker", "Worker()")}} constructor and usage of the object:</p>
+
+<pre class="brush: js">var myWorker = new Worker('worker.js');
+var first = document.querySelector('#number1');
+var second = document.querySelector('#number2');
+
+first.onchange = function() {
+  myWorker.postMessage([first.value,second.value]);
+  console.log('Message posted to worker');
+}</pre>
+
+<p>For a full example, see our<a class="external external-icon" href="https://github.com/mdn/simple-web-worker">Basic dedicated worker example</a> (<a class="external external-icon" href="http://mdn.github.io/simple-web-worker/">run dedicated worker</a>).</p>
+
+<h2 id="Especificações">Especificações</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Especificação</th>
+   <th scope="col">Estado</th>
+   <th scope="col">Comentário</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML WHATWG', "#worker", "Worker")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilidade_de_navegador">Compatibilidade de navegador</h2>
+
+<p>Support varies for different types of workers. See each worker type's page for specifics.</p>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Funcionalidade</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>4</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>3.5</td>
+   <td>10.0</td>
+   <td>10.6</td>
+   <td>4</td>
+  </tr>
+  <tr>
+   <td>Constructor <code>name</code> option</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatGeckoDesktop(55)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+  <tr>
+   <td><code>onmessageerror</code></td>
+   <td>60</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatGeckoDesktop(57)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Phone</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+   <th>Chrome for Android</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>4.4</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>3.5</td>
+   <td>10.0</td>
+   <td>11.5</td>
+   <td>5.1</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+  <tr>
+   <td>Constructor <code>name</code> option</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatGeckoMobile(55)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+  <tr>
+   <td><code>onmessageerror</code></td>
+   <td>60</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatGeckoMobile(57)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h3 id="Cross-origin_worker_error_behaviour">Cross-origin worker error behaviour</h3>
+
+<p>In earlier browser versions, trying to load a cross-origin worker script threw a <code>SecurityError</code>; in newer browsers an {{event("error")}} event is thrown instead due to a spec change. Find out more information on how to deal with this in <a href="https://www.fxsitecompat.com/en-CA/docs/2016/loading-cross-origin-worker-now-fires-error-event-instead-of-throwing-worker-in-sandboxed-iframe-no-longer-allowed/">Loading cross-origin worker now fires error event instead of throwing; worker in sandboxed iframe no longer allowed</a>.</p>
+
+<h2 id="Consultar_também">Consultar também</h2>
+
+<ul>
+ <li><a class="internal" href="/pt-PT/docs/Web/API/Web_Workers_API/Utilizacao_de_web_workers" title="en/Using DOM workers">Utilziar <em>workers</em> da Web</a></li>
+ <li><a href="/pt-PT/docs/Web/API/Web_Workers_API/Functions_and_classes_available_to_workers" title="https://developer.mozilla.org/En/DOM/Worker/Functions_available_to_workers">Funções disponíveis para os <em>workers</em></a></li>
+ <li>Outros tipos de <em>workers</em>: {{ domxref("SharedWorker") }} e <a href="/pt-PT/docs/Web/API/Service_Worker_API">ServiceWorker</a>.</li>
+ <li><em>Workers </em>não padrão, específicos Gecko: {{ domxref("ChromeWorker") }}, utilizados pelas extensões.</li>
+</ul>
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+  <td class="SL_td"><input></td>
+  <td class="SL_td"><select><option value="auto">Detectar idioma</option><option value="af">Africâner</option><option value="sq">Albanês</option><option value="de">Alemão</option><option value="ar">Arabe</option><option value="hy">Armênio</option><option value="az">Azerbaijano</option><option value="eu">Basco</option><option value="bn">Bengali</option><option value="be">Bielo-russo</option><option value="my">Birmanês</option><option value="bs">Bósnio</option><option value="bg">Búlgaro</option><option value="ca">Catalão</option><option value="kk">Cazaque</option><option value="ceb">Cebuano</option><option value="ny">Chichewa</option><option value="zh-CN">Chinês (Simp)</option><option value="zh-TW">Chinês (Trad)</option><option value="si">Cingalês</option><option value="ko">Coreano</option><option value="ht">Crioulo haitiano</option><option value="hr">Croata</option><option value="da">Dinamarquês</option><option value="sk">Eslovaco</option><option value="sl">Esloveno</option><option value="es">Espanhol</option><option value="eo">Esperanto</option><option value="et">Estoniano</option><option value="fi">Finlandês</option><option value="fr">Francês</option><option value="gl">Galego</option><option value="cy">Galês</option><option value="ka">Georgiano</option><option value="el">Grego</option><option value="gu">Gujarati</option><option value="ha">Hauça</option><option value="iw">Hebraico</option><option value="hi">Hindi</option><option value="hmn">Hmong</option><option value="nl">Holandês</option><option value="hu">Húngaro</option><option value="ig">Igbo</option><option value="id">Indonésio</option><option value="en">Inglês</option><option value="yo">Ioruba</option><option value="ga">Irlandês</option><option value="is">Islandês</option><option value="it">Italiano</option><option value="ja">Japonês</option><option value="jw">Javanês</option><option value="kn">Kannada</option><option value="km">Khmer</option><option value="lo">Laosiano</option><option value="la">Latim</option><option value="lv">Letão</option><option value="lt">Lituano</option><option value="mk">Macedônico</option><option value="ml">Malaiala</option><option value="ms">Malaio</option><option value="mg">Malgaxe</option><option value="mt">Maltês</option><option value="mi">Maori</option><option value="mr">Marathi</option><option value="mn">Mongol</option><option value="ne">Nepalês</option><option value="no">Norueguês</option><option value="fa">Persa</option><option value="pl">Polonês</option><option value="pt">Português</option><option value="pa">Punjabi</option><option value="ro">Romeno</option><option value="ru">Russo</option><option value="sr">Sérvio</option><option value="st">Sesotho</option><option value="so">Somália</option><option value="sw">Suaíli</option><option value="su">Sudanês</option><option value="sv">Sueco</option><option value="tg">Tadjique</option><option value="tl">Tagalo</option><option value="th">Tailandês</option><option value="ta">Tâmil</option><option value="cs">Tcheco</option><option value="te">Telugo</option><option value="tr">Turco</option><option value="uk">Ucraniano</option><option value="ur">Urdu</option><option value="uz">Uzbeque</option><option value="vi">Vietnamita</option><option value="yi">Yiddish</option><option value="zu">Zulu</option></select></td>
+  <td class="SL_td">
+   <div id="SL_switch_b" style="background: rgba(0, 0, 0, 0)  repeat scroll 0% 0%;" title="Alternar Idiomas"> </div>
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