const router = new Router({
routes: [{path: '/login',name: 'login',component: Login,meta: {isShow: true}},
    {path: '/',component: Layout,redirect: '/home',meta: {title: "首页菜单"},
    children: [{ path: 'home', name: 'home', component: () => import('@/views/Hmoe'),
    meta: { title: "首页" } }],}]
})

router.beforeEach((to, from, next) => {
 if (!to.meta.isShow && !sessionStorage.getItem("token")) {
  return next('/login');
 }
 next();
})

router.beforeEach((to, from, next) => {
 if (sessionStorage.getItem("token")) {
  if (to.meta.isShow) {
   next('/home')
  } else {
   next()
  }
 } else {
  next('/login');
 }
})
 
//检查代码
router.beforeEach((to, from, next) => {
 if (sessionStorage.getItem("token")) {
  if (to.meta.isShow) {
   console.log("1")
   next('/home')
  } else {
   console.log("2")
 
   next()
  }
 } else {
  console.log("3")
  next('/login');
 }
})

router.beforeEach((to, from, next) => {
 if (sessionStorage.getItem('token')) {//toekn存在
  if (to.path == '/login') {//token存在，并且是login页面
   next('/home');
  } else {//token存在，不是login页面
   next();
  }
 } else {
  if (to.path == '/login') {//token不存在，并且是login页面
   next();
  } else {//token不存在，不是login页面
   next('/login');
  }
 }
});

const originalPush = Router.prototype.push
Router.prototype.push = function push(location) {
return originalPush.call(this, location).catch(err => err)
}