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window.addEventListener("DOMMouseScroll",function(event){
alert(event.type)
alert(event.clientY)
},false);
var event = document.createEvent("MouseEvent");
//ΪÁËÖ¤Ã÷·ÖÅɳɹ¦£¬ÌØÒ⽫ÆäclientYÉèΪ90
event.initMouseEvent("DOMMouseScroll",true, null, window,0,0,0,0,90,false,false,false,false,0,null);
window.dispatchEvent(event)

<!doctype html>
<html lang="zh-ch">
<head>
<meta charset="utf-8" />
<meta content="IE=8" http-equiv="X-UA-Compatible"/>
<title>mousewheelµÄʼþ·ÖÅÉ by ˾ͽÕýÃÀ</title>
<script type="text/javascript">
window.onload = function(){
window.addEventListener("DOMMouseScroll",function(event){
alert(event.type)
alert(event.clientY)
},false);
var event = document.createEvent("MouseEvent");
//ΪÁËÖ¤Ã÷·ÖÅɳɹ¦£¬ÌØÒ⽫ÆäclientYÉèΪ90
event.initMouseEvent("DOMMouseScroll",true, null, window,0,0,0,0,90,false,false,false,false,0,null);
window.dispatchEvent(event)
}
</script>
<style title="text/css">
</style>
</head>
<body>
</body>
</html>

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