<!DOCTYPE html>
<html>
<head>
<script>
function myFunction() {
alert("感谢您访问W3School！");
}
</script>
</head>
<body onunload="myFunction()">
<h1>欢迎访问到我的主页</h1>
<p>关闭此窗口或按 F5 重新加载页面。</p>
</body>
</html>