use key vfor vue code example

Example 1: vue v-for

<ul id="example-1">
  <li v-for="item in items" :key="item.message">
    {{ item.message }}
  </li>
</ul>

Example 2: vue for loop

<ul id="v-for-object" class="demo">
  <li v-for="value in object">
    {{ value }} 
  </li>
</ul>