setTimeout

setTimeoutTest.js

var count = 1;

var ping = function(cb){
	setTimeout(function()
		{
			console.log("P....... " + count * 200 + "ms");
			count++;
			cb(ping);
		},200);
}

var pong = function(cb){
	setTimeout(function()
		{
			console.log(".......P "+ count * 200 + "ms");
			count++;
			cb(pong);
		},200);
}


var smash_timeout = 1030;
var smash = function(){
	console.log("<-------------------- " + smash_timeout + "ms");
};

ping(pong);
setTimeout(smash,smash_timeout);