代码放入头部即可

原作者：成天不高兴的栗山未来

<script>
    var OriginTitile=document.title;
    var st;
    document.addEventListener('visibilitychange',function(){
    if(document.hidden){
      document.title="(つェ⊂)我藏好了哦";
      clearTimeout(st);
      console.log('hide');
    }else{
      document.title='(*´∇｀*)  被你发现啦~ '+OriginTitile;
      console.log('show');
      st=setTimeout(function(){
          document.title=OriginTitile;
      },4000);
      console.log('endChange=');
    }
    });
</script>