How can I make something (grid) draw on the canvas?

Question

JavaScript

I have a canvas (canvas), I also write setInterval in js (and every second I clear the canvas and draw back, so that no traces of objects remain). But because of this, I can't fill the canvas with squares (grid), as it clears up, help please?)

Answer 1

It's obvious: you need to redraw the grid every frame. Well, or (it will be faster) draw the grid on another canvas, which is put under the first one.