vue 登录路由判断

  router.beforeEach((to, from, next) => {
   // alert(sessionStorage.getItem('accessToken'))
   //    console.log(to);
      if ((to.path!='/login')&&(!sessionStorage.getItem('accessToken') || sessionStorage.getItem('accessToken')=='undefined')) {
          next({
              path: '/login',
              // query: { redirect: to.fullPath }
          })
      } else {
          next()
      }
  })