// 从 canvas 提取图片 image
function convertCanvasToImage(canvas) {
//新Image对象,可以理解为DOM
var image = new Image();
// canvas.toDataURL 返回一串Base64编码的URL
image.src = canvas.toDataURL("image/png");
return image;
}
// 把image 转换为 canvas对象
function convertImageToCanvas(image) {
// 创建canvas DOM元素,并设置其宽高和图片一样
var canvas = document.createElement("canvas");
canvas.width = image.width;
canvas.height = image.height;
canvas.getContext("2d").drawImage(image, 0, 0);
return canvas;
}
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