Detecting rotation event of mouse wheel with JavaScript

As an actual example, "Google MapsThat is exactly the case. Rotating the wheel part of the mouse scales the map.

How can I implement the same mechanism? The story.
Mouse wheel programming in JavaScript
http://adomas.org/javascript-mouse-wheel/

Click here for the test page, the display changes as you rotate the mouse wheel
http://adomas.org/javascript-mouse-wheel/test.html

Other things can be done.

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