SOURCE

console 命令行工具 X clear

                    
>
console
new Vue({
    el: ".js-items",
    data: {
        items: ["HTML", "CSS", "JS", "JQ", "VUE"]
    },
})
 <ul class="js-items">
    <li v-if="!items.length">sorry, thert are no data</li>
   <template v-else>
        <li v-for="item in items">{{ item }} </li>
  </template>
 </ul>