JavaScriptでキャンバスの内容を画像にする

<div>
    <canvas id="drawCanvas" style="border: 1px solid black; direction: ltr;"></canvas>
</div>
<div>
    <img id="canvasImg" src="">
</div>

const canvas = document.getElementById('drawCanvas');
const base64 = canvas.toDataURL('image/jpeg', 0.75);
// imgタグに表示
document.getElementById('canvasImg').src = base64;

let a = document.createElement('a');
a.href = base64;
a.download = "canvas.jpg";
a.click();