if you need to send crosssite request you can do it via JSONP and via new Image(), if you use JSONP you can recive answer from server, if new Image – not, why GA uses new Image?
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if you need to send crosssite request you can do it via JSONP and via new Image(), if you use JSONP you can recive answer from server, if new Image – not, why GA uses new Image?
Because Google Analytics does not need to send anything back to your browser after getting your information from the initial request.
They make you ping their server with a new request (creating a new Image guarantees that your browser won’t cache the link) sending them all the information from your browser: UserAgent string, etc.
They don’t need JSONP because they’re not communicating so much as collecting data.