如何将DIV内容发送到html5 CANVAS

function getDivScreenshot(divId) {
  let div = document.getElementById(divId);
  let canvas = document.createElement('canvas');
  canvas.width = div.clientWidth;
  canvas.height = div.clientHeight;
  let ctx = canvas.getContext('2d');
  ctx.drawImage(div, 0, 0, canvas.width, canvas.height);
  return canvas;
}

function canvasToImage(canvas) {
  let img = new Image();
  img.src = canvas.toDataURL('image/png');
  return img;
}

function drawImageToCanvas(canvas, img) {
  let ctx = canvas.getContext('2d');
  ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
}

let divId = 'yourDivId';
let canvas = document.getElementById('yourCanvasId');
let divScreenshot = getDivScreenshot(divId);
let divImage = canvasToImage(divScreenshot);
drawImageToCanvas(canvas, divImage);