---
title: ImageData.width
slug: Web/API/ImageData/width
translation_of: Web/API/ImageData/width
---
<p>{{APIRef("Canvas API")}}</p>

<p>只读的 <code><strong>ImageData.width</strong></code> 属性，返回在图像数据对象中每一行像素的数量。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox"><em>imagedata</em>.width
</pre>

<h2 id="示例">示例</h2>

<pre class="brush: js  language-js">var imagedata = new ImageData(100, 100);
imagedata.width // 100
</pre>

<h2 id="Specification" name="Specification">规范描述</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('HTML WHATWG', 'scripting.html#dom-imagedata-width', 'ImageData.width')}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td> </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>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoDesktop("14")}}</td>
   <td>9.0</td>
   <td>9.0</td>
   <td>3.1</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>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoMobile("14")}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="参见">参见</h2>

<ul>
 <li>{{domxref("ImageData.height")}}</li>
</ul>

<div id="cke_pastebin" style="position: absolute; top: 459.5px; width: 1px; height: 1px; overflow: hidden; left: -1000px;"> </div>