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+---
+title: WheelEvent.deltaX
+slug: Web/API/WheelEvent/deltaX
+translation_of: Web/API/WheelEvent/deltaX
+---
+<p>{{APIRef("DOM Events")}}</p>
+
+<p><code><strong>WheelEvent.deltaX</strong></code> 只读属性是一个 <code>double</code> 类型值, 声明水平滚动量以{{domxref("WheelEvent.deltaMode")}} 为单位.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <code><em>dX</em> = <em>event</em>.deltaX;</code></pre>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js">var syntheticEvent = new WheelEvent("syntheticWheel", {"deltaX": 4, "deltaMode": 0});
+
+console.log(syntheticEvent.deltaX);
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM3 Events','#widl-WheelEvent-deltaX','WheelEvent.deltaX')}}</td>
+   <td>{{Spec2('DOM3 Events')}}</td>
+   <td>Initial definition.</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>31</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{ CompatGeckoDesktop("17.0") }}</td>
+   <td>{{ CompatIE("9.0") }} [1]</td>
+   <td>18</td>
+   <td>{{ CompatNo() }}</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>{{ CompatVersionUnknown() }}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{ CompatGeckoMobile("17.0") }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatVersionUnknown() }}</td>
+   <td>{{ CompatNo() }}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] IE9 支持一个规范的一个旧版本的草稿, 这里的值的类型是 <code>long</code> 而不是一个 <code>double</code> 类型的值.</p>
+
+<h2 class="note" id="另见">另见</h2>
+
+<ul>
+ <li>{{ event("wheel") }}</li>
+ <li>{{domxref("WheelEvent")}}</li>
+</ul>