Vue.js 之过渡动画2

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <script src="./vue-2.5.16.js"></script>
  <style>
    ul {
      padding: 0;
      margin: 0;
      list-style: none;
    }

    li {
      border: 1px dashed #ccc;
      background-color: #eee;
      line-height: 35px;
      font-size: 12px;
      padding-left: 10px;
      margin: 10px 0;
    }


    .v-enter,
    .v-leave-to {
      opacity: 0;
      transform: translateY(300px);
    }

    .v-enter-active,
    .v-leave-active {
      transition: all 2s ease;
    }

    /* 控制 即将被删除的那个元素，脱离标准流，从而允许后续的元素，往上顶 */

    .v-leave-active {
      position: absolute;
      width: 100%;
    }

    /* vue自带的效果 控制 那些将要往上顶的元素，通过 过渡，渐渐地顶上来 */

    .v-move {
      transition: all 2s ease;
    }
  </style>
</head>

<body>
  <div id="app">

    <div>
      <input type="text" v-model="name">
      <button @click="add">添加</button>
    </div>

    <ul>
      <!-- 1. 如果要为列表添加动画，必须使用 transition-group 把 v-for 循环渲染的元素，包裹起来  -->
      <transition-group>
        <li v-for="item in arr" :key="item.id" @click="remove(item.id)">
          {{item.name}}
        </li>
      </transition-group>
    </ul>

  </div>

  <script>
    // 创建 Vue 实例，得到 ViewModel
    var vm = new Vue({
      el: '#app',
      data: {
        // 新添加的用户名称
        name: '',
        arr: [
          { id: 1, name: '张三' },
          { id: 2, name: '李四' },
          { id: 3, name: '赵六' }
        ]
      },
      methods: {
        add() {
          const user = { id: this.arr.length + 1, name: this.name }
          this.arr.push(user)
          this.name = ''
        },
        remove(id) {
          const i = this.arr.findIndex(x => x.id === id)
          this.arr.splice(i, 1)
        }
      }
    });
  </script>
</body>

</html>
Vue.js 之 过渡动画2

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