Google analytics code snippet with jade template engine. Jade ' include ' allows you to insert the contents into another jade file simply.

google.analytics.jade

//

	Build Passing.

	Doctype: HTML5

	Jade: 1.3.0+

	#TODO[x]: Google analytics References

		https://developers.google.com/analytics/ →_→ Optimize Your 
		Business Using the Google Analytics Platform

		https://developers.google.com/analytics/devguides/collection/
		Google Analytics provides easy to use APIs and SDKs to send 
		data to Google Analytics.

		http://mathiasbynens.be/notes/async-analytics-snippet →_→ Opti-
		mizing the asynchronous Google Analytics snippet

script.
	
	var trackID, domainID;
	
	trackID = ''; //eg: 'UA-34398778-4'.
	
	domainID = ''; //eg: 'studio7designs.com'.
	
	(function (i, s, o, g, r, a, m) {
		
		i['GoogleAnalyticsObject'] = r;
		
		i[r] = i[r] || function () {
			
			(i[r].q = i[r].q || []).push(arguments);
			
		},
		
		i[r].l = 1 * new Date();
		
		a = s.createElement(o),
		
		m = s.getElementsByTagName(o)[0];
		
		a.async = 1;
		
		a.defer = 1;
		
		a.src = g;
		
		m.parentNode.insertBefore(a,m)
		
	})(window, document, 'script','//www.google-analytics.com/analytics.js', 'ga');
	
	ga('create', trackID, domainID);
	
	ga('send', 'pageview');

so how do you include it in your page?