vue导航守卫，判断token，跳入首页

// 使用 router.beforeEach 注册一个全局前置守卫，判断用户是否登陆
router.beforeEach((to, from, next) => {
  if (to.path === '/login') {
    next();
  } else {
    let token = window.sessionStorage.getItem("token")?window.sessionStorage.getItem("token"):null
 
    if (token === null || token === '') {
      next('/login');
    } else {
      next();
    }
  }
})