倒计时

(function() { 'use strict';

var root = this;

var Countdown = function(duration, onTick, onComplete) { var secondsLeft = Math.round(duration) , tick = function() { if (secondsLeft > 0) { onTick(secondsLeft); secondsLeft -= 1; } else { clearInterval(interval); onComplete(); } } // Setting the interval, by call tick and passing through this via a self-calling function wrap. , interval = setInterval( (function(self){ return function() { tick.call(self); }; })(this), 1000 );

// First tick.
tick.call(this);

return {
  abort: function() {
    clearInterval(interval);
  }

  , getRemainingTime: function() {
    return secondsLeft;
  }
};

};

if (typeof exports !== 'undefined') module.exports = exports = Countdown; else root.Countdown = Countdown;

}).call(this);