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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>