open graph protocol 使用

import Helmet from 'react-helmet'
const meta = [
  {
    property: 'og:image',
    content: 'path-to-image',
  },
  {
    property: 'og:url',
    content: siteMetadata.siteOgUrl + slug,
  },
  {
    property: 'og:title',
    content: title,
  },
  {
    property: 'og:description',
    content: post.excerpt || tags.join(' '),
  },
]

const Head = () => {
  return <Helmet htmlAttributes={{ lang: 'cn' }} title={title} meta={meta} />
}