feat:add seo,learning page can be directly studied through the url

src/main.ts

@@ -7,6 +7,7 @@ import router from "@/router.ts";
 import VueVirtualScroller from 'vue-virtual-scroller'
 import 'vue-virtual-scroller/dist/vue-virtual-scroller.css'
 import './types/global.d.ts'
+import loadingDirective from './directives/loading.tsx'
 
 const pinia = createPinia()
 const app = createApp(App)
@@ -18,5 +19,6 @@ app.use(router)
 app.directive('opacity', (el, binding) => {
   el.style.opacity = binding.value ? 1 : 0
 })
+app.directive('loading', loadingDirective)
 
 app.mount('#app')