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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">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>