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+---
+title: beforeprint
+slug: Web/Events/beforeprint
+translation_of: Web/API/Window/beforeprint_event
+---
+<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>