<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

<h1>Vue Js</h1>
    <h2>{{text}}</h2>
 <p>{{presentation(5,10)}}</p>

new Vue ({
    el: '#app',
    data: {
      text: 'Hello World'
    },
    methods: {
    	presentation: function(a,b){
        	return a + b;
        }
    }
})

Testez vos propres exemples sous Jsfiddle. Cliquez ici