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---
title: Event.defaultPrevented
slug: Web/API/Event/defaultPrevented
translation_of: Web/API/Event/defaultPrevented
---
<div>{{ APIRef("DOM") }}</div>
<h2 id="概述">概述</h2>
<p>回傳一個布林值，表示事件的預設行為是否被取消，也就是事件物件是否曾執行 {{domxref("event.preventDefault()", "preventDefault()")}} 方法。</p>
<div class="note"><strong>註：</strong>You should use this instead of the non-standard, deprecated<code> getPreventDefault()</code> method (see {{ bug(691151) }}).</div>
<h2 id="語法">語法</h2>
<pre class="eval">bool = event.defaultPrevented </pre>
<h2 id="範例">範例</h2>
<pre> if (e.defaultPrevented) {
/* the default was prevented */
}
</pre>
<h2 id="規範">規範</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
</thead>
<tbody>
<tr>
<td>{{SpecName('DOM WHATWG', '#dom-event-defaultprevented', 'Event.defaultPrevented()')}}</td>
<td>{{ Spec2('DOM WHATWG') }}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName('DOM4', '#dom-event-defaultprevented', 'Event.defaultPrevented')}}</td>
<td>{{Spec2('DOM4')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="瀏覽器相容性"><span style="font-size: 1.71428571428571rem; letter-spacing: -0.021em; line-height: 1;">瀏覽器相容性</span></h2>
<p>{{ CompatibilityTable() }}</p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{ CompatChrome(18) }}</td>
<td>{{ CompatGeckoDesktop("6.0") }}</td>
<td>{{ CompatIE(9.0) }}</td>
<td>{{ CompatOpera(11.0) }}</td>
<td>{{ CompatSafari("5.0") }}</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatGeckoMobile("6.0") }}</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatSafari(5.0) }}</td>
</tr>
</tbody>
</table>
</div>
<ul>
</ul>
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