如何每秒第二次从变量中移除一定次数的JavaScript？

Question

I am trying to subtract a certain amount from variable every second. How do I do that? When I search 'how to take away from a variable javascript', two things show up, how to delete a variable, and how to take away a certain number off a variable all at once. So I just searched up, how to say 'per second' in javascript and I would try to figure the other part on my own and I could not find that either.

Thanks in advance!

~John

Answer 1

You typically use setInterval for this, so...

var intervalId = setInterval(
  function() {
    // This function will be executed once every second (give or take)
    // You can subtract from your variable here

    // If you're done running, you can stop the interval using...
    clearInterval(intervalId);
  }, 1000, this);

Answer 2

var x = 10;
function reduce() {
   console.log(x);
   x = x-1;
   if (x === 0) return; 
   setTimeout(reduce, 1000); 
}
reduce();