一、使用JavaScript将图片拷贝进画布
function convertImageToCanvas(image)
{
var canvas = document.createElement("canvas");
canvas.width = image.width;
canvas.height = image.height;
canvas.getContext("2d").drawImage(image, 0, 0);
return canvas;
}
二、用JavaScript将画布保持成图片格式
function convertCanvasToImage(canvas)
{
var image = new Image();
image.src = canvas.toDataURL("image/png");
return image;
}