Vue 關閉瀏覽器清除Cookies

Vue 關閉瀏覽器清除登錄信息 

 mounted() {
    /*區分關閉和刷新，關閉退出登錄 start*/
    window.onload = function() {
      if (!window.sessionStorage["ISlogin"]) {
        Cookies.remove("token ");
        Cookies.remove("userInfo");
        location.reload(); //不能省，強制跳到登陸頁
      } else {
        window.sessionStorage.removeItem("ISlogin");
      }
    };
    window.onunload = function() {
      window.sessionStorage["ISlogin"] = true;
    };
    window.onbeforeunload = function() {
      window.sessionStorage["ISlogin"] = true;
    };
  },