用canvas建立图片

// 建立canvas DOM元素，并设置其宽高和图片同样   
    var canvas = document.createElement("canvas");  
    canvas.width = image.width;  
    canvas.height = image.height;  
    // 坐标(0,0) 表示今后处开始绘制，至关于偏移。  
    canvas.getContext("2d").drawImage(image, 0, 0);  
	console.log(canvas);
	image.src =canvas.toDataURL();
	//var imageSrc=canvas.toDataURL("image/png");

绘制和模仿图片

问题1：Tainted canvases may not be exported. ORS与Canvas图片toDataURL https://www.web-tinker.com/article/20687.html