How to print it out through a browser?

[xiaoniao]

Two-dimensional code can be saved into a picture? Because the two-dimensional code display can not be printed out through the browser print function.

function print() { window.print(); }

[jeromeetienne]

you can render to canvas and use .toDataUrl()

https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toDataURL