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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">总结</h2>
<p><code><strong>Promise</strong></code><strong><code>.prototype</code></strong> 属性表示 {{jsxref("Promise")}} 构造器的原型.</p>
<div>{{js_property_attributes(0,0,0)}}</div>
<h2 id="Description" name="Description">描述</h2>
<p>{{jsxref("Promise")}} 实例继承自 {{jsxref("Promise.prototype")}}. 你可以在构造器的原型对象添加属性或方法到所有 <code>Promise</code> 实例上.</p>
<h2 id="属性">属性</h2>
<dl>
<dt><code>Promise.prototype.constructor</code></dt>
<dd>返回被创建的实例函数. 默认为 {{jsxref("Promise")}} 函数.</dd>
</dl>
<h2 id="方法">方法</h2>
<dl>
<dt>{{jsxref("Promise.catch", "Promise.prototype.catch(onRejected)")}}</dt>
<dd>添加一个拒绝(rejection) 回调到当前 promise, 返回一个新的promise。当这个回调函数被调用，新 promise 将以它的返回值来resolve，否则如果当前promise 进入fulfilled状态，则以当前promise的完成结果作为新promise的完成结果.</dd>
<dt>{{jsxref("Promise.then", "Promise.prototype.then(onFulfilled, onRejected)")}}</dt>
<dd>添加解决(fulfillment)和拒绝(rejection)回调到当前 promise, 返回一个新的 promise, 将以回调的返回值来resolve.</dd>
<dt>{{jsxref("Promise.finally", "Promise.prototype.finally(onFinally)")}}</dt>
<dd>添加一个事件处理回调于当前promise对象，并且在原promise对象解析完毕后，返回一个新的promise对象。回调会在当前promise运行完毕后被调用，无论当前promise的状态是完成(fulfilled)还是失败(rejected)</dd>
</dl>
<h2 id="规范">规范</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="浏览器兼容">浏览器兼容</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="另见">另见</h2>
<ul>
<li>{{jsxref("Promise")}}</li>
</ul>
|
