[Vuejs]-Why does my Vue transition have no effect?

Try to use transition-group component and place it instead of ul tag like :

<transition-group name="section" tag="ul" class="booklist">

  <my-book
          v-for="book in bookFeed"
          v-bind:id="book.id"
          v-bind:title="book.node_title"
          v-bind:body="book.body"
          v-bind:path="book.path"
          v-bind:author="book.author"
          v-bind:coverimg="book.medium_img" >
  </my-book>

</transition-group>