console 命令行工具 X clear

console

/**
 * Created by houbingshuai on 2016/12/3.
 */
window.onload = function () {

    //顶点着色器程序
    var VSHADER_SOURCE =
        "void main() {" +
            //设置坐标
        "gl_Position = vec4(0.0, 0.0, 0.0, 1.0); " +
            //设置尺寸
        "gl_PointSize = 10.0; " +
        "} ";

    //片元着色器
    var FSHADER_SOURCE =
        "void main() {" +
            //设置颜色
        "gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);" +
        "}";
    //获取canvas元素
    var canvas = document.getElementById('canvas');
    //获取绘制二维上下文
    var gl = canvas.getContext('webgl');
    if (!gl) {
        console.log("Failed");
        return;
    }
    //编译着色器
    var vertShader = gl.createShader(gl.VERTEX_SHADER);
    gl.shaderSource(vertShader, VSHADER_SOURCE);
    gl.compileShader(vertShader);

    var fragShader = gl.createShader(gl.FRAGMENT_SHADER);
    gl.shaderSource(fragShader, FSHADER_SOURCE);
    gl.compileShader(fragShader);
    //合并程序
    var shaderProgram = gl.createProgram();
    gl.attachShader(shaderProgram, vertShader);
    gl.attachShader(shaderProgram, fragShader);
    gl.linkProgram(shaderProgram);
    gl.useProgram(shaderProgram);

    //绘制一个点
    gl.drawArrays(gl.POINTS, 0, 1);
}

<!DOCTYPE html>
<html>
<head>
    <meta lang="en">
    <meta charset="UTF-8">
    <title>WebGL study</title>
    <link href="style/style.css">
    <script type="text/javascript" src="js/js.js"></script>
</head>
<body>
<canvas id="canvas" width="200px" height="200px"></canvas>
</body>
</html>

body
{
    background-color:#d0e4fe;
}
h1
{
    color:orange;
    text-align:center;
}
p
{
    font-family:"Times New Roman";
    font-size:20px;
}