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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>
diff --git a/files/zh-cn/web/api/promiserejectionevent/promise/index.html b/files/zh-cn/web/api/promiserejectionevent/promise/index.html
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index 0000000000..d539826ce8
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+++ b/files/zh-cn/web/api/promiserejectionevent/promise/index.html
@@ -0,0 +1,66 @@
+---
+title: PromiseRejectionEvent.promise
+slug: Web/API/PromiseRejectionEvent/promise
+translation_of: Web/API/PromiseRejectionEvent/promise
+---
+<div>{{APIRef("HTML DOM") }}</div>
+
+<p> {{domxref("PromiseRejectionEvent")}}事件对象的<code><strong>promise</strong></code>属性是只读的,表明Promise被reject的原因。您可以通过检查{{domxref("PromiseRejectionEvent.reason")}}来了解Promise为什么被reject。</p>
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox"><em>promise</em> = <em>PromiseRejectionEvent</em>.promise</pre>
+
+<h3 id="Value">Value</h3>
+
+<p>一个被reject的,并且错误未被处理的{{jsxref("Promise")}} </p>
+
+<h2 id="Examples">Examples</h2>
+
+<p>下面的例子监听了未被处理的promise,如果{{domxref("PromiseRejectionEvent.reason", "reason")}} 是一个对象,并且其<code>code</code>属性包含了一段文本“Module not read.”,一个空闲的回调函数被声明,当任务执行错误时会进行重试</p>
+
+<p>{{domxref("event.preventDefault()")}} 用来表明该promise已被处理</p>
+
+<pre class="brush: js">window.onunhandledrejection = function(event) {
+ if (event.reason.code &amp;&amp; event.reason.code == "Module not ready") {
+ window.requestIdleCallback(function(deadline) {
+ loadModule(event.reason.moduleName)
+ .then(performStartup);
+ });
+ event.preventDefault();
+ }
+}</pre>
+
+<h2 id="Specifications">Specifications</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#dom-promiserejectionevent-promise', 'PromiseRejectionEvent.promise')}}</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>{{Compat("api.PromiseRejectionEvent.promise")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("Promise")}}</li>
+ <li>{{domxref("PromiseRejectionEvent")}}</li>
+ <li>{{event("rejectionhandled")}}</li>
+ <li>{{event("unhandledrejection")}}</li>
+</ul>
diff --git a/files/zh-cn/web/api/promiserejectionevent/promiserejectionevent/index.html b/files/zh-cn/web/api/promiserejectionevent/promiserejectionevent/index.html
new file mode 100644
index 0000000000..6d6e1e3d92
--- /dev/null
+++ b/files/zh-cn/web/api/promiserejectionevent/promiserejectionevent/index.html
@@ -0,0 +1,114 @@
+---
+title: PromiseRejectionEvent.PromiseRejectionEvent()
+slug: Web/API/PromiseRejectionEvent/PromiseRejectionEvent
+translation_of: Web/API/PromiseRejectionEvent/PromiseRejectionEvent
+---
+<div>{{APIRef("HTML DOM")}}</div>
+
+<p><code><strong>PromiseRejectionEvent()</strong></code> 构造器返回一个新创建的 {{domxref("PromiseRejectionEvent")}},代表一个JavaScript {{jsxref("Promise")}}被rejected时触发的事件。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">new PromiseRejectionEvent(<em>type</em>, {
+ promise: <em>somePromise</em>,
+ reason : <em>someValue</em>
+});
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<p><em><code>PromiseRejectionEvent()构造函数继承了</code>{{domxref("Event.Event", "Event()")}}的参数。</em></p>
+
+<dl>
+ <dt><code>type</code></dt>
+ <dd>一个代表PromiseRejectionEvent的类型名称的字符串。这是区分大小写的同时必须是{{event("rejectionhandled", '"rejectionhandled"')}} 或者 {{event("unhandledrejection", '"unhandledrejection"')}} 其中之一。</dd>
+ <dt><code>promise</code></dt>
+ <dd>代表被 rejected 的{{jsxref("Promise")}}。</dd>
+ <dt><code>reason</code></dt>
+ <dd>代表 promise 被 rejected的原因的值或者对象{{jsxref("Object")}} 。</dd>
+</dl>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js">var myRejectionEvent = new PromiseRejectionEvent('unhandledrejection', {
+ promise : myPromise,
+ reason : 'My house is on fire'
+});</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>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>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>Feature</th>
+ <th>Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support</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,实现了这个构造函数但是默认是禁用的。为了打开它,需去到 about:config 然后将 <code>dom.promise_rejection_events.enabled</code> 设置启用为真。</p>
+
+<h2 id="另请参阅">另请参阅</h2>
+
+<ul>
+ <li>{{jsxref("Promise")}}</li>
+ <li>{{domxref("PromiseRejectionEvent")}}</li>
+</ul>