자바스크립트 - canvas base64 데이터 추출

var image = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");  // here is the most important part because if you dont replace you will get a DOM 18 exception.

 

출처: 

https://stackoverflow.com/questions/10673122/how-to-save-canvas-as-an-image-with-canvas-todataurl

How To Save Canvas As An Image With canvas.toDataURL()?