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---
title: Promise.prototype
slug: conflicting/Web/JavaScript/Reference/Global_Objects/Promise
translation_of: Web/JavaScript/Reference/Global_Objects/Promise
translation_of_original: Web/JavaScript/Reference/Global_Objects/Promise/prototype
original_slug: Web/JavaScript/Reference/Global_Objects/Promise/prototype
---
<div>{{JSRef("Global_Objects", "Promise")}}</div>
<h2 id="Summary" name="Summary">Sumário</h2>
<p>A propriedade <code><strong>Promise</strong></code><strong><code>.prototype</code></strong> representa o protótipo para o construtor {{jsxref("Promise")}}.</p>
<div>{{js_property_attributes(0,0,0)}}</div>
<h2 id="Description" name="Description">Descrição</h2>
<p>{{jsxref("Promise")}} instância herdada de {{jsxref("Promise.prototype")}}. Você pode usar o objeto construtor para adicionar propriedades ou métodos para todas as instâncias de <code>Promise</code>.</p>
<h2 id="Propriedades">Propriedades</h2>
<dl>
<dt><code>Promise.prototype.constructor</code></dt>
<dd>Retorna a função que cria uma instância. Isso é a função padrão {{jsxref("Promise")}}.</dd>
</dl>
<h2 id="Métodos">Métodos</h2>
<dl>
<dt>{{jsxref("Promise.catch", "Promise.prototype.catch(onRejected)")}}</dt>
<dd>Adiciona um callback que trata rejeição para a promise e, retorna uma nova promise resolvendo o valor retornado do callback, se ele for chamado, ou para seu valor original de conclusão se a promise for realizada.</dd>
<dt>{{jsxref("Promise.then", "Promise.prototype.then(onFulfilled, onRejected)")}}</dt>
<dd>Adiciona os métodos de tratamento da realização e rejeição da promise e, retorna uma nova promise resolvendo para o valor do método chamado.</dd>
</dl>
<h2 id="Especificações">Especificações</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td>{{SpecName('ES6', '#sec-promise.prototype', 'Promise.prototype')}}</td>
<td>{{Spec2('ES6')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<p>{{CompatibilityTable}}</p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td>32</td>
<td>{{CompatGeckoDesktop(24.0)}} as <code>Future</code><br>
{{CompatGeckoDesktop(25.0)}} as <code>Promise</code> behind a flag[1]<br>
{{CompatGeckoDesktop(29.0)}} by default</td>
<td>{{CompatNo}}</td>
<td>19</td>
<td>7.1</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
<th>Chrome for Android</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatNo}}</td>
<td>{{CompatGeckoMobile(24.0)}} as <code>Future</code><br>
{{CompatGeckoMobile(25.0)}} as <code>Promise</code> behind a flag[1]<br>
{{CompatGeckoMobile(29.0)}} by default</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
<td>iOS 8</td>
<td>32</td>
</tr>
</tbody>
</table>
</div>
<p>[1] Gecko 24 has an experimental implementation of <code>Promise</code>, under the initial name of <code>Future</code>. It got renamed to its final name in Gecko 25, but disabled by default behind the flag <code>dom.promise.enabled</code>. <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=918806">Bug 918806</a> enabled Promises by default in Gecko 29.</p>
<h2 id="See_also">See also</h2>
<ul>
<li>{{jsxref("Promise")}}</li>
</ul>
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