Firework auto create?

[htantruc]

In your code, firework were created by touch/click. But I want it auto create with 1 firework / second. I just try but I can't do it like my hope. Can you show me, can I edit your code in what function.

More than, I want to add this script in my website for next vacation, and I want to remove black bacground. What should I do?

Thanks.