Vue 2.0 Hello World

HTML

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

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

JavaScript

new Vue({
  el: '#app',
  data: {
    message: 'Hello Vue.js!'
  },
  updated() {
    console.log('test')
  }, 
  mounted() {
  	this.message = 'Hello I changed';
  }
})