切换网页标题更改

document.addEventListener("visibilitychange", function () {
      console.log("111");
      if (document.hidden) {
        document.title = "(┬＿┬)";
        clearTimeout(titleTime);
      } else {
        document.title = "Document";
        titleTime = setTimeout(function () {
          document.title = OriginTitile;
        }, 200);
      }
    });