vue.js, simple v-for / v-bind to add index to class name : <p>I can't seem to find the syntax to loop through my items and give each 'li' a class corresponding to the index.  How is this done?   </p>

<pre><code>&lt;li v-for="(item, idx) in items class="idx""&gt;
&lt;/li&gt;
</code></pre>
