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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: PromiseRejectionEvent
+slug: Web/API/PromiseRejectionEvent
+translation_of: Web/API/PromiseRejectionEvent
+---
+<div>{{APIRef("HTML DOM")}}</div>
+
+<p><strong><code>PromiseRejectionEvent</code></strong> 接口表示出现在JavaScript {{jsxref("Promise")}}s 被rejecte (拒绝) 时触发的事件。这些事件对遥测(远程测试)和调试特别的有用。</p>
+
+<h2 id="构造函数">构造函数</h2>
+
+<dl>
+ <dt>{{domxref("PromiseRejectionEvent.PromiseRejectionEvent", "PromiseRejectionEvent()")}}</dt>
+ <dd>用给定的参数生成一个 <code>PromiseRejectionEvent</code> 事件。</dd>
+</dl>
+
+<h2 id="属性">属性</h2>
+
+<p><em>也从它的父级{{domxref("Event")}}继承属性。</em></p>
+
+<dl>
+ <dt>{{domxref("PromiseRejectionEvent.promise")}} {{readOnlyInline}}</dt>
+ <dd>被 rejected 的 JavaScript {{jsxref("Promise")}} 。</dd>
+ <dt>{{domxref("PromiseRejectionEvent.reason")}} {{readOnlyInline}}</dt>
+ <dd>一个值或 {{jsxref("Object")}} 表明为什么 promise 被 rejected,并传递给{{jsxref("Promise.reject()")}}。</dd>
+</dl>
+
+<h2 id="方法">方法</h2>
+
+<p><em>没有特定的方法; 从它的父级 {{domxref("Event")}}继承方法。</em></p>
+
+<h2 id="事件">事件</h2>
+
+<dl>
+ <dt>{{Event("unhandledrejection")}}</dt>
+ <dd>在一个JavaScript {{jsxref("Promise")}} 被 reject(拒绝) 但是没有 reject 处理函数来处理时触发。</dd>
+ <dt>{{Event("rejectionhandled")}}</dt>
+ <dd>在一个JavaScript {{jsxref("Promise")}} 被 reject 时触发,在 reject 后由promise的 reject 处理函数处理。 </dd>
+</dl>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js">window.onunhandledrejection = function(e) {
+ console.log(e.reason);
+}</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName('HTML WHATWG', 'webappapis.html#promiserejectionevent', 'PromiseRejectionEvent')}}</td>
+ <td>{{ Spec2('HTML WHATWG') }}</td>
+ <td>Initial definition.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>功能</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>基本支持</td>
+ <td>49</td>
+ <td>{{CompatNo}}<sup>[1]</sup></td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatNo}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>功能</th>
+ <th>Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>基本支持</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatNo}}<sup>[1]</sup></td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatNo}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] 在 Firefox 里,有实现这个接口但是默认是禁用的。要打开它的话,去到about:config 将 <code>dom.promise_rejection_events.enabled 启用为真。</code></p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{jsxref("Promise")}}</li>
+ <li>{{domxref("WindowEventHandlers.onrejectionhandled")}}</li>
+ <li>{{domxref("WindowEventHandlers.onunhandledrejection")}}</li>
+</ul>