Vue 2.0 Hello World

HTML

<script src="https://unpkg.com/vue"></script>

<div id="app">
  <span>Parent value: {{ dataTest }}</span>
  <test :datatest="dataTest" />
</div>

JavaScript

var test = {
  props: ['datatest'],
  mounted: function() {
    this.datatest.push(10)
  },
  render: function() {}
}

new Vue({
  el: '#app',
  components: {
    'test': test
  },
  data: function() {
    return {
      dataTest: []
    }
  }
})