JS监听元素滚动

使用监听 scroll 可以实现监听页面滚动或者元素滚动是否到底

案例代码

<template>
  <div class="app-container">
    <div class="box">
      <div v-for="(item,index) in count" :key="index" class="item">
        {
   
   { item }}
      </div>
    </div>
  </div>
</template>

<script>
export default {
      
      
  name: "test",
  data() {
      
      
    return {
      
      
      count: 20
    }
  },
  mounted() {
      
      
    this.handlerNodeScroll()
  },
  methods: {
      
      
    // 监听元素滚动
    handlerNodeScroll() {
      
      
      let that = this
      // 函数防抖
      let fun = that.debounce(e => {
      
      
        // 距顶部
        let scrollTop = e.target.scrollTop;
        // 可视区高度
        let clientHeight = e.target.clientHeight;
        // 滚动条总高度
        let scrollHeight = e.target.scrollHeight;
        // 如果当前距离顶部的值加上可视区域的值大于等于总高度，则任务滚动条触底
        if (Math.ceil(scrollTop + clientHeight) >= scrollHeight) {
      
         //容差：20px
          console.log('滚动到底部');
          if (that.count >= 50) return
          that.count += 10
        }
      }, 500)
      
      // 监听滚动
      let box = document.querySelector(".box");
      box.addEventListener("scroll", function (e) {
      
      
        fun(e)
      })
    },
    // 函数防抖
    debounce(handle, delay) {
      
      
      let timer = null;
      return function () {
      
      
        let _self = this,
          _args = arguments;
        clearTimeout(timer);
        timer = setTimeout(function () {
      
      
          handle.apply(_self, _args)
        }, delay)
      }
    }
  }
}
</script>

<style scoped lang="scss">
.box {
      
      
  width: 200px;
  height: 400px;
  border: 1px solid #7c7c7c;
  padding: 15px;
  box-sizing: border-box;
  overflow: auto;

  .item {
      
      
    margin-bottom: 10px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    background-color: #1482f0;
    font-size: 18px;
    font-weight: 700;
    color: white;
  }
}
</style>

运行效果