End Message at the end of countdown timer

Hi!

I'm making a game on animate for uni. I was wondering within HTML 5 canvas after my timer finishes the 90 seconds, show an end game frame that I have made already. 

var secondsLeft = 90;

this.countdown_txteasy.text = secondsLeft;

var timerId = setInterval(countdown.bind(this), 1000);

function countdown(){

if(secondsLeft == 0){

}

else{

secondsLeft--;

this.countdown_txteasy.text = secondsLeft;

}

}

That is what I have for my timer and would want a message after the 90 seconds.