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+---
+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>