教大家一个给个人网站中添加变动标题的方法

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var originTitle = document.title,  titleTime;
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document.addEventListener('visibilitychange',  function() {
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    if (document.hidden)  {
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        document.title  = "Σ(っ °Д °;)っ 页面崩溃啦！";
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    } else {
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        document.title  = "(≧∇≦)ﾉ 欢迎回来~";
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        clearTimeout(titleTime);
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        titleTime = setTimeout(function() {
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            document.title  = originTitle;
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        }, 2000); // 2秒后恢复原标题
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    }
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});