为网站加上一个动态标题

离开网页标题就会变，回来后就会恢复正常

代码：

<script>
//动态标题
var OriginTitile = document.title,
titleTime;
document.addEventListener("visibilitychange",
function() {
    if (document.hidden) {
        document.title = "╮(╯﹏╰）╭ 网页崩溃啦！";
        clearTimeout(titleTime)
    } else {
        document.title = "(/≧▽≦/) 咦！又好了！ " ;
        titleTime = setTimeout(function() {
            document.title = OriginTitile
        },
        1000)
    }
});
</script>