“Cómo establecer el lienzo en el fondo HTML” Código de respuesta

Cómo establecer el lienzo en el fondo HTML

document.body.style.background = "url(" + canvas.toDataURL() + ")";
To actually set this as the background, you can take advantage of the canvas element's toDataURL method which will create an image from your canvas, which you can set as the src of an image or a background