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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.drawingBufferHeight
+slug: Web/API/WebGLRenderingContext/drawingBufferHeight
+tags:
+ - API
+ - WebGL
+ - WebGLRenderingContext
+ - 参考
+ - 只读
+ - 属性
+translation_of: Web/API/WebGLRenderingContext/drawingBufferHeight
+---
+<div>{{APIRef("WebGL")}}</div>
+
+<p><code><strong>WebGLRenderingContext.drawingBufferHeight</strong></code> 只读属性,指示当前绘图缓冲区的实际高度。它应当匹配与绘图上下文相关联的 {{HTMLElement("canvas")}} 元素的高度属性, 如果实现未能提供所要求的高度,其值将有所不同。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var><em>gl</em></var>.drawingBufferHeight;</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高度:</p>
+
+<pre class="brush: js">var canvas = document.getElementById("canvas");
+var gl = canvas.getContext("webgl");
+gl.drawingBufferHeight; // 150
+</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-drawingBufferHeight", "WebGLRenderingContext.drawingBufferHeight")}}</td>
+ <td>{{Spec2("WebGL")}}</td>
+ <td>初始定义</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.drawingBufferHeight")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{domxref("WebGLRenderingContext.drawingBufferWidth")}}</li>
+ <li>{{domxref("WebGLRenderingContext.viewport()")}}</li>
+</ul>