下面这段代码可以在页面关闭的时候自定义信息提示你
<html>
<head>
<title></title>
<script type="text/javascript">
function ConfirmClose() {
window.event.returnValue = "请先保存好数据";
}
function ShowConfirmClose(blnValue) {
if(blnValue) {
document.body.onbeforeunload = ConfirmClose;
} else {
document.body.onbeforeunload = null;
}
}
</script>
</head>
<body onload="ShowConfirmClose(true)">
</body>
</html>