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<!DOCTYPE html>
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<html>
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<head>
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    <title>MouseWheel Event Example</title>
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    <script type="text/javascript" src="/upload/files/201702/client.js"></script>
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    <script type="text/javascript" src="/upload/files/201702/EventUtil.js"></script>
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</head>
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<body>
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    <div id="myDiv">Try scrolling your mouse wheel (IE, Safari, and Opera).</div>
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    <script type="text/javascript">
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        EventUtil.addHandler(document, "mousewheel", function(event){
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            event = EventUtil.getEvent(event);
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            var delta = (client.engine.opera && client.engine.opera < 9.5 ? -event.wheelDelta : event.wheelDelta);
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            alert(delta);
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        });
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​
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    </script>
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</body>
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</html>
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