var canvas=document.createElement("canvas"); canvas.width=160; canvas.height=120; var ctx=canvas.getContext("2d"); var img=new Image(); img.src="data:image/png;base64,(略)"; ctx.drawImage(img,0,0); var imageElem=document.createElement("img"); imageElem.src=canvas.toDataURL("image/png"); document.body.appendChild(imageElem); var canvas=document.createElement("canvas"); canvas.width=160; canvas.heigh