关闭页面触发事件

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>

2021-11-09
2022-12-23
2021-09-12
2022-01-25
2022-12-23
2021-12-19
2022-12-23
2022-12-23