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authorFlorian Merz <me@fiji-flo.de>2021-02-11 14:49:58 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 14:49:58 +0100
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+---
+title: Promise.prototype
+slug: Web/JavaScript/Reference/Global_Objects/Promise/prototype
+translation_of: Web/JavaScript/Reference/Global_Objects/Promise
+translation_of_original: 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>