console 命令行工具 X clear

console

const canvas = document.getElementById('canvas')
const ctx = canvas.getContext('2d')

<canvas id="canvas"></canvas>

* {
    margin: 0;
    padding: 0;
}

canvas {
    width: 500px;
    height: 300px;
    margin: 100px;
    background-color: #ccc;
}