A jQuery plugin for simple countdown timer.

To use this library, you need to include jQuery library.

let options = {
  seconds: 5,
  loop: true,
  callback: function () {
    // do something
  }
};
$('#selector').countdownTimer({options});

• Set the number of seconds, the default is 5 seconds.
• Set whether to loop the timer or not.
  • If loop is true, when the timer hits 0, it loops back to the original (5) seconds.
• Set the callback function, the default is null.
  • If the callback function is not null, it is called when the timer hits 0.