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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>aaaaaaaaa</title>
<script>
window.onbeforeunload = function(e) {
e=e||window.event;
if ((function(){
var mx=e.screenX||e.pageX, my=e.clientY||e.pageY
var w=top.window.document.body.offsetWidth||window.innerWidth;
return(my < 0 && mx > (w - 25));
})()) {
s="\n\n\n============================================\n\n";
s+="点取消按钮,不许退!";
s+="\n\n=============================================\n\n\n";
event.returnValue=s ;
}
}
</script>
<body>
考考考考考考考考考考考考考考考考考考考考考考考考考考考考考考考考考
</body>
</html>
window.open('','','fullscreen=3')
<script language="javascript">
window.onbeforeunload = function(){
alert(1);
return false;
}
</script>