Vue 2.0 Hello World

HTML

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

<div id="app">
  <p v-if="number > 80">{{number}} A</p>
  <p v-if="79 > number > 40">{{number}} B</p>
  <p v-if="39 > number">{{number}} C</p>
</div>

JavaScript

new Vue({
  el: '#app',
  data: {
    number: 80
  }
})