Vue.js Simple Databinding

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.0.3/vue.min.js"></script>
<div id="app">

    <h1 v-if="language == 'ko'">
        {{ message.ko }}
    </h1>
    
    <h1 v-if="language == 'en'">
        {{ message.en }}
    </h1>
    
    <input v-model="language">

    <pre>
{{ $data | json }}  
    </pre>

</div>

JavaScript

new Vue({
	el: '#app',
    data: {
    language:'en',
    	message: {
      en:'Hello World!',
      ko:'헬로 월드!'
      }
    }
});