---
title: pageshow
slug: Web/API/Window/pageshow_event
translation_of: Web/API/Window/pageshow_event
original_slug: Web/Events/pageshow
---
<p>当一条会话历史记录被执行的时候将会触发页面显示(pageshow)事件。(这包括了后退/前进按钮操作，同时也会在onload 事件触发后初始化页面时触发)</p>

<h2 id="基本信息">基本信息</h2>

<dl>
 <dt style="float: left; text-align: right; width: 120px;">规范</dt>
 <dd style="margin: 0 0 0 120px;"><a class="external" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/history.html#event-pageshow">HTML5</a></dd>
 <dt style="float: left; text-align: right; width: 120px;">接口</dt>
 <dd style="margin: 0 0 0 120px;"><a href="/en-US/docs/Web/API/PageTransitionEvent">PageTransitionEvent</a></dd>
 <dt style="float: left; text-align: right; width: 120px;">事件冒泡</dt>
 <dd style="margin: 0 0 0 120px;">No</dd>
 <dt style="float: left; text-align: right; width: 120px;">事件取消</dt>
 <dd style="margin: 0 0 0 120px;">No</dd>
 <dt style="float: left; text-align: right; width: 120px;">事件源</dt>
 <dd style="margin: 0 0 0 120px;">Document (dispatched on Window)</dd>
 <dt style="float: left; text-align: right; width: 120px;">默认操作</dt>
 <dd style="margin: 0 0 0 120px;">None</dd>
</dl>

<h2 id="属性">属性</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Property</th>
   <th scope="col">Type</th>
   <th scope="col">Description</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td><code>target</code> {{readonlyInline}}</td>
   <td>{{domxref("EventTarget")}}</td>
   <td>The event target (the topmost target in the DOM tree).</td>
  </tr>
  <tr>
   <td><code>type</code> {{readonlyInline}}</td>
   <td>{{domxref("DOMString")}}</td>
   <td>The type of event.</td>
  </tr>
  <tr>
   <td><code>bubbles</code> {{readonlyInline}}</td>
   <td>{{jsxref("Boolean")}}</td>
   <td>Whether the event normally bubbles or not.</td>
  </tr>
  <tr>
   <td><code>cancelable</code> {{readonlyInline}}</td>
   <td>{{jsxref("Boolean")}}</td>
   <td>Whether the event is cancellable or not.</td>
  </tr>
  <tr>
   <td><code>persisted</code> {{readonlyInline}}</td>
   <td>{{jsxref("boolean")}}</td>
   <td>表示网页是否是来自缓存.</td>
  </tr>
 </tbody>
</table>

<h2 id="示例">示例</h2>

<p>以下示例将会在控制台打印由前进/后退按钮以及load事件触发后引起的pageshow事件：</p>

<pre>window.addEventListener('pageshow', function(event) {
    console.log('after , pageshow :',event);
});


window.addEventListener('load', function() {
    console.log('before');
});
</pre>





<p>不规范的写法，你同样可以将这个事件当做一个属性添加到body标签，类似于onload</p>

<pre>&lt;body onload="myonload()" onpageshow="mypageshowcode()"&gt;</pre>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

{{Compat("api.Window.pageshow_event")}}

<h2 id="相关事件">相关事件</h2>

<ul>
 <li><a href="/en-US/docs/Mozilla_event_reference/pagehide"><code>pagehide</code></a></li>
 <li><a href="/en-US/docs/Using_Firefox_1.5_caching#pageshow_event">Using Firefox 1.5 caching — pageshow event</a></li>
</ul>