timer.js

Timer = function() {
};
Timer.prototype = {
	initialize: function() {
		this.time = [];
		this.paused = false;
	},

	stack: function() {
		var now = (new Date()).getTime();
		this.time.push(now);
		return now;
	},

	start: function() {
		this.initialize();
		this.stack();
		return 0;
	},

	stop: function() {
		var t = this.time;
		var length = t.length;
		if (length % 2) {
			this.stack();
			++length;
		}

		var ret = 0;
		for (var i = 0; i < length; i += 2) {
			var time = t.slice(i, i + 2);
			console.log(t, time);
			ret += time[1] - time[0];
		}
		return ret;
	},

	record: function() {
		return this.time;
	},

	count: function() {
		var t = this.time;
		return (new Date()).getTime() - t[t.length - 1];
	},

	pause: function() {
		if (this.paused) return this.paused;

		var now = this.stack();

		var t = this.time;
		var last = t[t.length - 2];
		return this.paused = now - last;
	},

	restart: function() {
		if (!this.paused) return;

		this.stack();

		var last = this.paused;
		this.paused = false;
		return last;
	}
};