Vue.js 元素ui-禁用el标记上的动画

我一直在深入研究代码，但无法确定on-enter动画的来源：

这是一把小提琴：

小提琴的代码：

.html

默认情况下，转换处于启用状态。使用“禁用转换”属性可禁用：

<div id="app">
  <input type="checkbox" v-model="showUndone"> <label>Show undone ?</label>
  <ol>
    <li v-for="todo in todos" v-if="todo.done || !todo.done && showUndone">
      <el-tag disable-transitions>{{todo.text}}</el-tag>
    </li>
  </ol>
</div>

new Vue({
  el: "#app",
  data: {
      showUndone: false,
    todos: [
      { text: "Learn JavaScript", done: false },
      { text: "Learn Vue", done: false },
      { text: "Play around in JSFiddle", done: true },
      { text: "Build something awesome", done: true }
    ]
  },
  methods: {
    toggle: function(todo){
        todo.done = !todo.done
    }
  }
})

<div id="app">
  <input type="checkbox" v-model="showUndone"> <label>Show undone ?</label>
  <ol>
    <li v-for="todo in todos" v-if="todo.done || !todo.done && showUndone">
      <el-tag disable-transitions>{{todo.text}}</el-tag>
    </li>
  </ol>
</div>