html2canvas截屏 生成base64图片文件

html2canvas(document.querySelector("#capture")).then(canvas => {

	const context = canvas.getContext('2d');
	
	// 关闭抗锯齿形
	context.mozImageSmoothingEnabled = false;
	context.webkitImageSmoothingEnabled = false;
	context.msImageSmoothingEnabled = false;
	context.imageSmoothingEnabled = false;
	
	// canvas转化为图片
	const img = canvas2Image(canvas, canvas.width, canvas.height);
	document.body.appendChild(img);
	img.style.cssText = "width:100%;height:100%;position:absolute;top:0;left:0;right:0;bottom:0;opacity:1;";
	
	//document.body.appendChild(canvas); //canvas

});

function canvas2Image(canvas, width, height) {
	const retCanvas = document.createElement('canvas');
	const retCtx = retCanvas.getContext('2d');
	retCanvas.width = width;
	retCanvas.height = height;
	retCtx.drawImage(canvas, 0, 0, width, height, 0, 0, width, height);
	const img = document.createElement('img');
	img.src = retCanvas.toDataURL('image/jpeg');  // 可以根据需要更改格式
	return img;
}