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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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