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Nov 14th, 2019
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  1. var timerStart = self.addEventListener("message", function(e) {
  2. if(e.data.startTimer) {
  3. startTimer();
  4. }
  5. if(e.data.stopTimer) {
  6. stopTimer();
  7. }
  8. }, false);
  9.  
  10. var timerInterval = null;
  11.  
  12. function myTimer(d0)
  13. {
  14. // get current time
  15. var d = (new Date()).valueOf();
  16. var startValue = 120000;
  17. var diff = startValue - (d - d0);
  18. var seconds = Math.floor(diff / 1000);
  19.  
  20. seconds = seconds.toString();
  21. if (seconds.length == 1) {
  22. seconds = "0" + seconds;
  23. }
  24.  
  25. // return output to Web Worker
  26. postMessage(seconds);
  27. }
  28.  
  29. function startTimer() {
  30.  
  31. // get current time
  32. var d0 = (new Date()).valueOf();
  33.  
  34. if(timerInterval !== null) {
  35. clearInterval(timerInterval);
  36. }
  37.  
  38. timerInterval = setInterval(function() {
  39. myTimer(d0);
  40. }, 100);
  41. }
  42.  
  43. function stopTimer() {
  44. return clearInterval(timerInterval);
  45. }
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