Edit in JSFiddle

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

<h1>Vue.js</h1>
<div id="content">
    <label>
        <input type="checkbox" v-model="show">
            show
        </input>
    </label>
    <p v-show="show">Yeah!!</p>
</div>