<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- <link rel="stylesheet" href="/static/css/common.css"> -->
<title>Document</title>
</head>
<body>
<canvas id="example" width="512" height="512">
游览器不支持
</canvas>
</body>
<script>
var canvas = document.getElementById('example');
if(canvas==null){
alert("获取失败")
}
// 获取 WebGL 上下文对象
// var gl = getWebGLContext(canvas);
// 获取 WebGL 上下文对象
var gl = canvas.getContext('webgl');
//指定清空<canvas>颜色,就是指定canvas的背景色,第四个参数是透明度,范围是(0-1)
gl.clearColor(0.0,0.0,0.0,1.0)
//清空<canvas>
//gl.COLOR_BUFFER_BIT(颜色缓存)、gl.DEFTH_BUFFER_BIT(深度缓冲区)、gl.STENCIL_BUFFER_BIT(模板缓冲区)
gl.clear(gl.COLOR_BUFFER_BIT);
</script>
</html>
WebGl-2.清空canvas
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转载自blog.csdn.net/qq_25064691/article/details/120228648
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