标签：document title href visibilitychange images oldTitle titleTime 页面
var titleTime, oldTitle = document.title;
document.addEventListener("visibilitychange", function() {
if (document.hidden) {
document.title = "咦，去哪儿啊？";
clearTimeout(titleTime);
document.getElementById('shortcut').href = "images/fail.ico";
}
else{
document.title = "欢迎回来！" + oldTitle;
document.getElementById('shortcut').href = "images/favicon.ico";
titleTime = setTimeout(function(){
document.title = oldTitle;
}, 2e3)
}
})
标签：document,
title,
href,
visibilitychange,
images,
oldTitle,
titleTime,
页面
From： https://blog.51cto.com/u_16307147/7955126