This post was updated 909 days ago and some of the ideas may be out of date.

在<head>标签里面添加下面的代码:

记得放在<script></script>里面~

document.addEventListener('visibilitychange', function () {
if (document.visibilityState == 'hidden') {
normal_title = document.title;
document.title = '😱 别走啊~快回来!';
}
else document.title = normal_title;
});

PS:

1.里面的document.title内容可以修改成你想要的

2.标题可以附带Emoji 表情