can we use Binary write in javascript to write image file

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Javascript

I have this code in my handler file which write binary content of file to browser and allows user to view/download/save it.
I have a requirement where i want to write image file to browser ,image file is created using HTML5 canvas and the image data is retrieved using toDataURL() method of canvas. Is there any way to write this data to browser using javascript something similar to my existing c# code

private void WriteFile(byte[] content, string fileName, string contentType, HttpResponse response)
       {
           response.Buffer = true;
           response.Clear();
           response.ContentType = contentType;
           string extension = System.IO.Path.GetExtension(fileName);
           if (extension != ".htm" && extension != ".html" && extension != ".xml")
           {
               response.AddHeader("content-disposition", "attachment; filename=" + fileName);
           }
           response.BinaryWrite(content);
           response.Flush();
           response.End();
       }