const virtualDOM = {
    (중략)
    {
      type: 'body',
      props: null,
      children: [
        {
          type: 'h1',
          props: null,
          children: [{ type: 'text', text: 'header' }]
        },
        {
          type: 'a',
          props: { href: '#' },

          children: [{ type: 'text', text: 'change' }] // link -> change로 변경

        }
      ]
    }
  ]
};