How is Google analytics implemented? [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened开发者_JAVA百科, visit the help center. Closed 11 years ago.

I mean how google analytics gathering data from client side.

My guess is that GA put js code in client side, and using the js as interceptor to send client data to data gathering server using ajax before user do anything in client side.

Do my guess right?

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I believe that ga.js makes a request for a 1x1 .gif file, and in the request for that gif, it passes along all the parameters used by analytics, such as screen resolution, operating system etc.

Update: Screenshot from google chrome below