i finally did it idk how but i did it
here is updated code
function isMonsterHit(){
return (Math.random() > .2);
}
idk why in javascript u can return a value when in the function there is nothing but im new to this so we learn new things everyday .
update go to the new level and it was wrong this is how it was supposed to be:
function isMonsterHit() {
return Math.random() > .2;
}