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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: WebGLRenderingContext.drawingBufferWidth
+slug: Web/API/WebGLRenderingContext/drawingBufferWidth
+tags:
+ - API
+ - WebGL
+ - WebGLRenderingContext
+ - 参考
+ - 只读
+ - 属性
+translation_of: Web/API/WebGLRenderingContext/drawingBufferWidth
+---
+<div>{{APIRef("WebGL")}}</div>
+
+<p><code><strong>WebGLRenderingContext.drawingBufferWidth </strong></code>只读属性, 指示当前绘图缓冲区的实际宽度。它应当匹配与绘图上下文相关联的 {{HTMLElement("canvas")}} 元素的宽度属性。如果实现未能提供所要求的宽度,值将有所不同。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var><em>gl</em></var>.drawingBufferWidth;</pre>
+
+<h2 id="示例">示例</h2>
+
+<p>指定{{HTMLElement("canvas")}} 元素:</p>
+
+<pre class="brush: html">&lt;canvas id="canvas"&gt;&lt;/canvas&gt;
+</pre>
+
+<p>你可以通过下面几行代码来获取绘图缓冲区的宽度:</p>
+
+<pre class="brush: js">var canvas = document.getElementById('canvas');
+var gl = canvas.getContext('webgl');
+gl.drawingBufferWidth; // 300
+</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("WebGL", "#DOM-WebGLRenderingContext-drawingBufferWidth", "WebGLRenderingContext.drawingBufferWidth")}}</td>
+ <td>{{Spec2("WebGL")}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div class="hidden">
+<p>此页面上的兼容性表格由结构化数据生成。如果你想贡献数据,可以看看 <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a>并向我们发送 pull request.</p>
+</div>
+
+<p>{{Compat("api.WebGLRenderingContext.drawingBufferWidth")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{domxref("WebGLRenderingContext.drawingBufferHeight")}}</li>
+ <li>{{domxref("WebGLRenderingContext.viewport()")}}</li>
+</ul>