JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://vuejs.org/js/vue.min.js"></script>
<div id="demo" v-cloak>
   <a :href="url">url 1</a>
   <a :href="'//' + url">url 2</a>
</div>

JavaScript

var demo = new Vue({
    el: '#demo',
    data: {
        url: "www.bing.com",
    }
})