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---
title: copy
slug: Web/API/Element/copy_event
tags:
  - Clipboard API
  - Event
  - Reference
translation_of: Web/API/Element/copy_event
original_slug: Web/Events/copy
---
<p>当用户通过浏览器UI(例如,使用 <kbd>Ctrl</kbd>/<kbd></kbd>+<kbd>C</kbd>  键盘快捷方式或从菜单中选择“复制”)启动复制操作并响应允许的{{domxref("Document.execCommand","document.execCommand('copy')")}}调用时触发<code>copy</code>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://www.w3.org/TR/clipboard-apis/#the-copy-action">Clipboard</a></dd>
 <dt style="float: left; text-align: right; width: 120px;">Interface</dt>
 <dd style="margin: 0 0 0 120px;">{{domxref("ClipboardEvent")}}</dd>
 <dt style="float: left; text-align: right; width: 120px;">Bubbles</dt>
 <dd style="margin: 0 0 0 120px;">Yes</dd>
 <dt style="float: left; text-align: right; width: 120px;">Cancelable</dt>
 <dd style="margin: 0 0 0 120px;">Yes</dd>
 <dt style="float: left; text-align: right; width: 120px;">Target</dt>
 <dd style="margin: 0 0 0 120px;">{{domxref("Element")}}:获得焦点的元素(如{{domxref("HTMLElement.contentEditable","contentEditable")}}内容能编辑或者可以选中的元素),或{{HTMLElement("body")}}</dd>
 <dt style="float: left; text-align: right; width: 120px;">Default Action</dt>
 <dd style="margin: 0 0 0 120px;">见下文。</dd>
</dl>

<p>调用{{domxref("DataTransfer.setData","setData(format, data)")}}可以修改{{domxref("ClipboardEvent.clipboardData")}}事件的默认行为:</p>

<pre class="brush: js">document.addEventListener('copy', function(e){
    e.clipboardData.setData('text/plain', 'Hello, world!');
    e.clipboardData.setData('text/html', '&lt;b&gt;Hello, world!&lt;/b&gt;');
    e.preventDefault(); // We want our data, not data from any selection, to be written to the clipboard
});</pre>

<p>不能使用{{domxref("DataTransfer.getData", "clipboardData.getData()")}}在事件处理函数中获取剪切板数据。</p>

<p>事件的默认行为与事件的来源和事件处理函数相关:</p>

<ul>
 <li><a href="/en-US/docs/Web/Guide/Events/Creating_and_triggering_events">synthetic</a> copy事件没有默认行为,除非:</li>
 <li>如果默认事件没有取消,就复制到选区(如果有选中内容)到剪切板;</li>
 <li>如果取消了默认事件,但是调用了<code>setData()</code>方法:就复制<code>clipboardData</code>的内容到到剪切板;</li>
 <li>如果取消了默认行为,而且没有调用<code>setData()</code>方法,就没有任何行为。</li>
</ul>

<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>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

{{Compat("api.Element.copy_event")}}

<h2 id="参见">参见</h2>

<ul>
 <li>{{domxref("HTMLElement.oncopy")}}</li>
 <li>Related events
  <ul>
   <li>{{event("cut")}}</li>
   <li>{{event("paste")}}</li>
  </ul>
 </li>
</ul>