关于vue.js:Vue2nextTick

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<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title></title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>
<body>
  <div id="app">
    <ul ref="ulRef">
      <li v-for="(item, index) in items" :key="index">
        {{item}}
      </li>
    </ul>
    <button @click="add"> add </button>
  </div>
</body>
<script>
  var app = new Vue({
    el: '#app',
    data() {
      return{items: ['1', '2', '3']
      }
    },
    methods: {add() {this.items.push(Math.random())
        // dom 异步渲染完结后执行
        this.$nextTick(() => {
          const ul = this.$refs.ulRef
          const len = ul.childNodes.length
          console.log('len', len)
        })
        
      }
    }
  })
</script>
</html>

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