activeMenu() {
  const route = this.$route;
  const { meta, path } = route;
  // if set path, the sidebar will highlight the path you set
  if (meta.activeMenu) {
    return meta.activeMenu;
  }
  if (path == "/screen/screenIn") {
    let routeUrl = this.$router.resolve({
      path,

    });
    //新窗口打开页面  
    window.open(routeUrl.href, "_blank");
    //原窗口保持原来的页面
    this.$router.go(-1);
    return false;
  }

  return path;
},

设置允许弹窗后   

无限循环弹窗求大佬指导   效果只想弹一次就行