SOURCE

const vue = new Vue({
    el: '#app',
    data: {
        message: 'hello vue'
    }
})

// 构造器
const Profile = Vue.extend({
  template: '<p>{{firstName}} {{lastName}} aka {{alias}}</p>',
  data: function () {
    return {
      firstName: 'Walter',
      lastName: 'White',
      alias: 'Heisenberg'
    }
  }
})

new Profile().$mount('#mount-point')

<div id="app">
    {{message}}
</div>

<div id="mount-point">mount-point</div>