files/zh-cn/web/api/window/beforeprint_event/index.html


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---
title: beforeprint
slug: Web/API/Window/beforeprint_event
translation_of: Web/API/Window/beforeprint_event
original_slug: Web/Events/beforeprint
---
<p>当相关联的文档即将打印或预览以进行打印时，将触发beforeprint事件。</p>

<h2 id="基本信息">基本信息</h2>

<dl>
 <dt style="float: left; text-align: right; width: 120px;">Specification</dt>
 <dd style="margin: 0 0 0 120px;"><a class="external" href="https://html.spec.whatwg.org/multipage/webappapis.html#printing">HTML5</a></dd>
 <dt style="float: left; text-align: right; width: 120px;">Interface</dt>
 <dd style="margin: 0 0 0 120px;">Event</dd>
 <dt style="float: left; text-align: right; width: 120px;">Bubbles</dt>
 <dd style="margin: 0 0 0 120px;">No</dd>
 <dt style="float: left; text-align: right; width: 120px;">Cancelable</dt>
 <dd style="margin: 0 0 0 120px;">No</dd>
 <dt style="float: left; text-align: right; width: 120px;">Target</dt>
 <dd style="margin: 0 0 0 120px;">DefaultView (<code>&lt;window&gt;</code>)</dd>
 <dt style="float: left; text-align: right; width: 120px;">Default Action</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">属性</th>
   <th scope="col">类型</th>
   <th scope="col">描述</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td><code>target</code> {{readonlyInline}}</td>
   <td>{{domxref("EventTarget")}}</td>
   <td>事件目标 (DOM 树中的最顶层目标)</td>
  </tr>
  <tr>
   <td><code>type</code> {{readonlyInline}}</td>
   <td>{{domxref("DOMString")}}</td>
   <td>时间类型</td>
  </tr>
  <tr>
   <td><code>bubbles</code> {{readonlyInline}}</td>
   <td>{{jsxref("Boolean")}}</td>
   <td>事件是否冒泡</td>
  </tr>
  <tr>
   <td><code>cancelable</code> {{readonlyInline}}</td>
   <td>{{jsxref("Boolean")}}</td>
   <td>事件是否可取消</td>
  </tr>
 </tbody>
</table>

<h2 id="样例">样例</h2>

<p>使用 <code>addEventListener()</code>：</p>

<pre class="brush: js notranslate">window.addEventListener('beforeprint', (event) =&gt; {
  console.log('Before print');
});</pre>

<p>使用 <code>onbeforeprint</code> 事件监听属性：</p>

<pre class="brush: js notranslate">window.onbeforeprint = (event) =&gt; {
  console.log('Before print');
};</pre>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName('HTML WHATWG', '#event-beforeprint')}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>


<p>{{Compat("api.Window.beforeprint_event")}}</p>

<h2 id="相关事件">相关事件</h2>

<ul>
 <li><a href="https://developer.mozilla.org/zh-CN/docs/Web/Events/afterprint">afterprint</a></li>
</ul>