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+---
+title: PageTransitionEvent
+slug: Web/API/PageTransitionEvent
+translation_of: Web/API/PageTransitionEvent
+---
+<p>{{APIRef("HTML DOM")}}</p>
+
+<p>Page transition events fire when a webpage is being loaded or unloaded.</p>
+
+<p>当网页在加载完成或卸载后会触发页面传输事件（Page transition events）。</p>
+
+<h2 id="DOM_Information">DOM Information</h2>
+
+<p> </p>
+
+<h3 id="Inheritance_Hierarchy">Inheritance Hierarchy</h3>
+
+<div> Event
+<div>   PageTransitionEvent</div>
+</div>
+
+<h2 id="Example">Example</h2>
+
+<h3 id="HTML">HTML</h3>
+
+<pre class="brush: html">&lt;!DOCTYPE html&gt;
+&lt;html&gt;
+&lt;body onpageshow="myFunction(event)"&gt;
+&lt;/body&gt;
+&lt;/html&gt;</pre>
+
+<h3 id="JavaScript">JavaScript</h3>
+
+<pre class="brush: js">function myFunction(event) {
+    if (event.persisted) {
+        alert("The page was cached by the browser");
+    } else {
+        alert("The page was NOT cached by the browser");
+    }
+}</pre>
+
+<h2 id="Members">Members</h2>
+
+<p>The <strong>PageTransitionEvent</strong> object has these types of members:</p>
+
+<ul>
+ <li><a href="#">Properties</a></li>
+</ul>
+
+<h3 id="Properties">Properties</h3>
+
+<p>The <strong>PageTransitionEvent</strong> object has these properties.</p>
+
+<table class="members" id="memberListProperties">
+ <tbody>
+  <tr>
+   <th>Property</th>
+   <th>Access type</th>
+   <th>Description</th>
+  </tr>
+  <tr>
+   <td>
+    <p><strong>persisted</strong></p>
+   </td>
+   <td>只读</td>
+   <td>
+    <p>标记页面是否从缓存（Backforward Cache）中加载</p>
+   </td>
+  </tr>
+ </tbody>
+</table>
+
+<p> </p>