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---
title: show
slug: Web/API/Element/show_event
translation_of: Web/API/Element/show_event
---
<p>当一个具有contextmenu属性的元素的contextmenu事件触发或冒泡到该元素时,show事件会被触发。</p>
<h2 id="基本信息">基本信息</h2>
<dl>
<dt style="float: left; text-align: right; width: 120px;">标准</dt>
<dd style="margin: 0 0 0 120px;"><a class="external" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/interactive-elements.html#context-menus">HTML5</a></dd>
<dt style="float: left; text-align: right; width: 120px;">接口</dt>
<dd style="margin: 0 0 0 120px;">Event</dd>
<dt style="float: left; text-align: right; width: 120px;">冒泡</dt>
<dd style="margin: 0 0 0 120px;">否</dd>
<dt style="float: left; text-align: right; width: 120px;">可关闭</dt>
<dd style="margin: 0 0 0 120px;">否</dd>
<dt style="float: left; text-align: right; width: 120px;">触发对象</dt>
<dd style="margin: 0 0 0 120px;">Element</dd>
<dt style="float: left; text-align: right; width: 120px;">默认动作</dt>
<dd style="margin: 0 0 0 120px;">显示由相关目录元素创建的上下文目录</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>事件的目标对象 (DOM树中的最高层元素)。</td>
</tr>
<tr>
<td><code>type</code> {{readonlyInline}}</td>
<td>{{domxref("DOMString")}}</td>
<td>事件类型。</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>事件是否可以关闭。</td>
</tr>
</tbody>
</table>
<h2 id="例子">例子</h2>
<pre class="brush:html;"><div contextmenu="test"></div>
<menu type="context" id="test">
<menuitem label="alert" onclick="alert('the alert label has been clicked')" />
</menu>
<script>
document.getElementById("test").addEventListener("show", function(e){
alert("the context menu will be displayed");
}, false);
</script>
</pre>
<h2 id="相关事件">相关事件</h2>
<ul>
<li><a href="https://developer.mozilla.org/en-US/Mozilla_event_reference/contextmenu"><code>contextmenu</code></a></li>
</ul>
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