<script for=window event=onbeforeunload>
if (event.clientX>document.body.clientWidth &&event.clientY<0||event.altKey)
return("请先保存再关闭?")
</script>
if (event.clientX>document.body.clientWidth &&event.clientY<0||event.altKey)
return("请先保存再关闭?")
</script>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>test page</title>
<script for=window event=onbeforeunload>
if (document.all.textfield.value=="")
return("请先保存再关闭?")
</script>
</head><body>
<form name="form1" method="post" action="">
<input type="text" name="textfield">
</form>
</body>
</html>