VUE实时监听元素距离顶部高度的操作

<!-- 监听ref距离顶部高度 -->
<div ref="pronbit">
 <div>今日热门</div>
 <div>今日热销</div>
</div>

mounted(){
 window.addEventListener('scroll',this.handleScrollx,true)
},
methods: {
 handleScrollx() {
  console.log('滚动高度',window.pageYOffset)
  console.log('距离顶部高度',this.$refs.pronbit.getBoundingClientRect().top)
 },
}

  <div id="app">
    <div id="div" v-if="showDiv">这是一段文本</div>
    <button @click="getText">获取div内容</button>
  </div>
  <script>
  var app = new Vue({
    el : "#app",
    data:{
      showDiv : false
    },
    methods:{
      getText:function(){
        this.showDiv = true;
        var text = document.getElementById('div').innnerHTML;
         console.log(text);
      }
    }
  })
  </script>

  <div id="app">
    <div id="div" v-if="showDiv">这是一段文本</div>
    <button @click="getText">获取div内容</button>
  </div>
  <script>
  var app = new Vue({
    el : "#app",
    data:{
      showDiv : false
    },
    methods:{
      getText:function(){
        this.showDiv = true;
        this.$nextTick(function(){
           var text = document.getElementById('div').innnerHTML;
           console.log(text); 
        });
      }
    }
  })
  </script>