Дмитрий

const human = {
  planet: 'Earth',
}

const tom = Object.create(human);
tom.name = 'Tom';
tom.age = 32;
tom.country = 'UK';

console.log(tom.planet);

// => Earth

const human = {
  planet: 'Earth',
}

const tom = Object.create(human);
tom.name = 'Tom';
tom.age = 32;
tom.country = 'UK';

human.planet = 'Mars';

console.log(tom.planet);

// => Mars

const human = {
  planet: 'Earth',
}

const tom = Object.create(human);
tom.name = 'Tom';
tom.age = 32;
tom.country = 'UK';

tom.planet = 'Jupiter';
human.planet = 'Mars';

console.log(tom.planet);

// => Jupiter

console.log(human.planet);

// => Mars

const human = {
  planet: 'Earth',
}

const tom = $.extend({}, human);
tom.name = 'Tom';
tom.age = 32;
tom.country = 'UK';

const processNonEmptyObjectOnly = (f, defaultResult) =>
  data => (
    data = data instanceof Object ? Object.entries(data) : [],
    data.length ? f(data) : defaultResult
  );

const createTreeHTML = processNonEmptyObjectOnly(data => `
  <ul>${data.map(n => `
    <li>
      ${n[0]}
      ${createTreeHTML(n[1])}
    </li>`).join('')}
  </ul>`
, '');


document.body.insertAdjacentHTML('beforeend', createTreeHTML(data));

const createTreeElement = processNonEmptyObjectOnly(data =>
  data.reduce((ul, n) => (
    ul.append(document.createElement('li')),
    ul.lastChild.append(n[0], createTreeElement(n[1])),
    ul
  ), document.createElement('ul'))
, '');


document.body.append(createTreeElement(data));

created() {
  const onClickOutside = e => this.opened = this.$el.contains(e.target) && this.opened;
  document.addEventListener('click', onClickOutside);
  this.$on('hook:beforeDestroy', () => document.removeEventListener('click', onClickOutside));
},

actions: {
         async initialCityList({ commit }) {
            const siteContacts = await fetch('/api/contacts')
            commit('setSiteContacts',  await siteContacts.json())
        }
    },

actions: {
         async initialCityList({ commit }) {
            const siteContacts = await axios.get('/api/contacts')
            commit('setSiteContacts', siteContacts.data)
        }
    },