interval.js

  1. /**
  2.  * Source: https://gist.github.com/manast/1185904
  3.  */
  4. function interval(duration, fn) {
  5. 	this.baseline = undefined
  6.  
  7. 	this.run = function() {
  8. 		if(this.baseline === undefined) {
  9. 			this.baseline = new Date().getTime()
  10. 		}
  11. 		fn()
  12. 		var end = new Date().getTime()
  13. 		this.baseline += duration
  14.  
  15. 		var nextTick = duration - (end - this.baseline)
  16. 		if(nextTick < 0) {
  17. 			nextTick = 0;
  18. 		}
  19. 		(function(i) {
  20. 			i.timer = setTimeout(function() {
  21. 				i.run(end)
  22. 			}, nextTick)
  23. 		}(this))
  24. 	}
  25.  
  26. 	this.stop = function() {
  27. 		clearTimeout(this.timer)
  28. 	}
  29. }
  30.  
  31. /*** Usage ***/
  32.  
  33. var timer = new interval(50, function() {
  34. 	console.log(new Date().getTime())
  35. })
  36. timer.run()
  37.  
  38.