//app.config.ts
export default defineAppConfig({
    title: 'Hello Nuxt888',
    theme: {
      dark: true,
      colors: {
        primary: '#ff0000'
      }
    }
  })
 //app.vue
 {{ appConfig.title }}
 const appConfig = useAppConfig()

 //另外一个简洁的用法是写在composables中，export即可引用
export const title = "hello nuxt"