vue3（上拉/触底）加载更多

核心原理

• 监听页面的滚动事件

  window.addEventListener('scroll', function)
  

• 获取可视窗口高度，滚动高度，滚动条高度

  document.documentElement.clientHeight; // 获取可视高度
  document.documentElement.scrollTop     // 获取滚动高度
  document.documentElement.scrollHeight  // 获取滚动条高度
  

页面代码

<template>
  <div class="container">
    <ul>
      <li class="item" v-for="(item, index) in dataList" :key="index">{{ item }}</li>
    </ul>
  </div>
</template>

<script setup>
import { reactive } from 'vue';
const dataList = reactive([1, 2, 3, 4])

// 节流方法
const throttle = (func, delay) => {
  let timer = null;
  return function () {
    if (!timer) {
      timer = setTimeout(() => {
        func.apply(this, arguments);
        timer = null
      }, delay)
    }
  }
}
// 触底函数
const onReachBottom = () => {
  window.addEventListener('scroll', throttle(onBottom, 200))
}
// 触底相应函数
const onBottom = () => {
  // 获取可视高度
  let clientHeight = document.documentElement.clientHeight;
  // 获取滚动高度
  let scrollTop = document.documentElement.scrollTop
  // 滚动条高度
  let scrollHeight = document.documentElement.scrollHeight
  if (clientHeight + scrollTop > scrollHeight) {
    console.log('触底了')
    dataList.push(dataList.length + 1)
  }
}
onReachBottom()
</script>

<style lang="scss" scoped>
.item {
  margin-top: 20px;
  width: 200px;
  height: 200px;
  font-size: 30px;
  text-align: center;
  line-height: 200px;
  background-color: hotpink;
}
</style>