路由守卫简单逻辑

router.beforeEach((to,from,next) => {

  let token = localStorage.getItem('token')

  // alert(token)  //debug

  if(token){
    next()
  } else {
    if( to.path === '/login' || to.path === '/register' || from.path === '/register'){
      next()
    } else {
      next('/login')
    }

  }
})