js实现canvas保存图片为png格式并下载到本地

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function exportCanvasAsPNG(id, fileName) {     var canvasElement = document.getElementById(id);     var MIME_TYPE = "image/png";     var imgURL = canvasElement.toDataURL(MIME_TYPE);     var dlLink = document.createElement('a');     dlLink.download = fileName;     dlLink.href = imgURL;     dlLink.dataset.downloadurl = [MIME_TYPE, dlLink.download, dlLink.href].join(':');     document.body.appendChild(dlLink);     dlLink.click();     document.body.removeChild(dlLink); }<br> for(let i = 1; i< 23; i++) {     exportCanvasAsPNG("cw-pdf-" + i, "cw-pdf-" + i +".png") }