如何在本地将一个画布的内容复制到另一个画布

const sourceCanvas = document.getElementById('sourceCanvas');
const sourceContext = sourceCanvas.getContext('2d');

const targetCanvas = document.getElementById('targetCanvas');
const targetContext = targetCanvas.getContext('2d');

targetContext.drawImage(sourceCanvas, 0, 0);

const image = new Image();
image.src = targetCanvas.toDataURL('image/png');