Countdown.js 
Countdown.js is a library that allows developers to set countdowns for any kind of interaction. For example, if you would like to submit a form, Countdown.js allows you to set a 5 second countdown and give the user a chance to cancel the submission. You can see it in action here.
Installation
If you use bower:
bower install countdown.js
Otherwise, you can download it from here.
API
new Countdown(duration, onTick, onComplete)
Begins a countdown. After duration time has passed, the function onComplete will be executed. Every second, the onTick function will be executed.
Example:
var countdown = new Countdown(5, function(seconds) {
console.log(seconds); //log the number of seconds that have passed
}, function() {
console.log("Countdown complete!") //log that the countdown has complete
});
abort()
Terminates countdown.
Example:
countdown.abort();
getRemainingTime()
Returns remaining time in seconds.
Example:
countdown.getRemainingTime(); //=> 4
Example
http://gumroad.github.io/countdown.js/
Contribute
Install development dependencies
npm install
Test
npm test
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