Nuxt asyncData update title

[wangjing013]

export default {
  async asyncData ({ app, params }: Context) {
    const post: PostOrPage = await app.$ghost.posts.read(
      {
        slug: params.slug
      },
      { include: 'tags' }
    )

    return {
      post
    }
  }

  head () {
    return {
      title: this.post.title,
      meta: [
        {
          hid: 'description',
          name: 'description',
          content: this.post.excerpt
        }
      ]
    }
  }
}