WebGLRenderingContext.drawingBufferHeight
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
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WebGLRenderingContext.drawingBufferHeight 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 <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。
语法
gl.drawingBufferHeight;
示例
指定 <canvas> 元素：
html
<canvas id="canvas"></canvas>
你可以通过下面几行代码来获取绘图缓冲区的高度：
js
var canvas = document.getElementById("canvas");
var gl = canvas.getContext("webgl");
gl.drawingBufferHeight; // 150
规范
| Specification |
|---|
| WebGL Specification # DOM-WebGLRenderingContext-drawingBufferHeight |