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---
title: copy
slug: Web/Events/copy
tags:
- Clipboard API
- Event
- Reference
translation_of: Web/API/Element/copy_event
---
<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', '<b>Hello, world!</b>');
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>
<p>{{ CompatibilityTable() }}</p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Edge</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari (WebKit)</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatUnknown() }}</td>
</tr>
<tr>
<td><code>clipboardData</code></td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{ CompatGeckoDesktop(22) }}</td>
<td>{{ CompatNo() }}</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatUnknown() }}</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Edge</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Phone</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{ CompatUnknown() }}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatUnknown() }}</td>
</tr>
<tr>
<td><code>clipboardData</code></td>
<td>{{ CompatUnknown() }}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{ CompatGeckoMobile(22) }}</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatUnknown() }}</td>
</tr>
</tbody>
</table>
</div>
<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>
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