vue中v-for的使用

<div id="app">
    <ul>
        <li v-for="value in arr">{{value}}普通循环</li>
        <li v-for="(item,index) in users" :key="index"> {{index+1}}---{{item.id}} {{item.name}} {{item.age}}key指定唯一性</li>
    </ul>
</div>
<script>
new Vue({
    el: '#app',
    data: {
        arr: [12, 4, 5, 34, 2, 11],
        users: [{
                id: 9527,
                name: '李世民',
                age: 22
            },
            {
                id: 1001,
                name: '嬴政',
                age: 23
            },
            {
                id: 1002,
                name: '刘彻',
                age: 24
            }
        ]
    }
});
</script>