Edit in JSFiddle

new Vue({
    el: '#content',
    data: {
        enabled: false
    }
});

<h1>Vue.js</h1>
<div id="content">
    <label>
        <input type="checkbox" v-model="enabled">
            enabled
        </input>
    </label>
    <select v-attr="disabled: !enabled">
        <option>a</option>
        <option>b</option>
        <option>c</option>
    </select>
</div>