onunload
suibian
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>
suibian
</title>
</head>
<body>
<script type="text/javascript">
window.onunload=onunload-message;
function onunload-message(){
alert('difhjf');
}
</script>
hkjdfhk
</body>
</html>
为什么离开页面时没出现提示框?
