1.在app.vue中

关闭浏览器清除信息，并且刷新时保持状态不受影响

 mounted() {
    window.onload = function () {
      console.log(window.sessionStorage["ISlogin"]);
      if (!window.sessionStorage["ISlogin"]) {
        // 关闭浏览器
        window.localStorage.removeItem("userInfo");
      } else {
        // 刷新
      }
    };
    window.onunload = function () {
      window.sessionStorage["ISlogin"] = true;
    };
    window.onbeforeunload = function () {
      window.sessionStorage["ISlogin"] = true;
    };
  },