<div id="mvvm-app">
    <input type="text" v-model="word">
    <p>{{word}}</p>
    <button v-on:click="sayHi">change model</button>
</div>

<script src="observer.js"></script>
<script src="watcher.js"></script>
<script src="compile.js"></script>
<script src="mvvm.js"></script>
<script>
var vm = new MVVM({
    el: '#mvvm-app',
    data: {
        word: 'Hello World!'
    },
    methods: {
        sayHi: function() {
            this.word = 'Hi, everybody!';
        }
    }
    });
</script>