when you use nuxtjs to support ssr, you can defined meta info in page vue component. and you should set metadata each page?

No! you can just add nuxt-seo-meta to your project.

i have made this npm to reduce time defined redundancy meta.

in nuxt-seo-meta you just defined you care info and reset all meta info nuxt-seo-meta will auto generate.
include twitter, facebook social meta.

here show the screenshoot for you

use in asyncData

async asyncData({ seoMeta }) {
  seoMeta({
    title: "PageTitle",
    description: "PageDescription",
    url: "PageUrl",
    image: 'SocialShareImage.png'
  })
}

use in head

head({$seoMeta}){
  return {
   meta: $seoMeta({...options}, false)
  }
}

you can find more info here