JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://unpkg.com/[email protected]/dist/vue.js"></script>

<div id="app">
  <h1>{{ getFullName() }}</h1>
</div>

JavaScript

new Vue({
	el: '#app',
  data: {
    firstname: 'Bo',
    lastname: 'Anderson'
  },
  methods: {
    getFullName: function() {
        console.log(this);
        return this.firstname + ' ' + this.lastname;
    }
  }
});