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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>
{{Compat("api.WheelEvent.deltaX")}}
<h2 class="note" id="另见">另见</h2>
<ul>
<li>{{ event("wheel") }}</li>
<li>{{domxref("WheelEvent")}}</li>
</ul>
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