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+---
+title: CanvasRenderingContext2D.drawWidgetAsOnScreen()
+slug: Web/API/CanvasRenderingContext2D/drawWidgetAsOnScreen
+tags:
+  - CanvasRenderingContext2D
+translation_of: Web/API/CanvasRenderingContext2D/drawWidgetAsOnScreen
+---
+<div>{{APIRef}} {{non-standard_header}}</div>
+
+<div>这个内部使用非标准的Canvas 2D API 的方法<code><strong>CanvasRenderingContext2D.drawWidgetAsOnScreen()为Canvas（画布）上的窗口提供了根部件。不像</strong></code>{{domxref("CanvasRenderingContext2D.drawWindow", "drawWindow()")}}这个API，它使用操作系统来获取屏幕上部件的快照而不是从Gecko自己的组合中读取</div>
+
+<p> </p>
+
+<p>这个API用在Web内容上。它只支持Windows系统中Chrome进程中使用OMTC的小部件</p>
+
+<h2 id="句法">句法</h2>
+
+<pre class="syntaxbox">void <var><em>ctx</em>.</var>drawWidgetAsOnScreen<var>(window);</var>
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>window</code></dt>
+ <dd> {{domxref("Window")}} 提供.</dd>
+</dl>
+
+<h2 id="说明">说明</h2>
+
+<p>不是当前规范或者草案的一部分. 这是一个内部使用的无标准的API.</p>
+
+<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>{{CompatNo}}</td>
+   <td>{{CompatGeckoDesktop(41)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</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>Chrome for 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>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile(41)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>接口定义，{{domxref("CanvasRenderingContext2D")}}。</li>
+ <li>{{domxref("CanvasRenderingContext2D.drawWindow()")}}</li>
+</ul>