vue3组件封装-无线加载组件（页面到达底部自动加载数据）

当页面翻到最下面的时候，会自动发送请求去请求加载数据

组件代码

src/components/infinite.vue

<template>
  <div class="xtx-infinite-loading" ref="target">
    <div class="loading" v-if="loading">
      <span class="img"></span>
      <span class="text">正在加载...</span>
    </div>
    <div class="none" v-if="finished">
      <span class="img"></span>
      <span class="text">亲，没有更多了</span>
    </div>
  </div>
</template>
<script>
import { ref } from 'vue'
import { useIntersectionObserver } from '@vueuse/core'

export default {
  name: 'XtxInfiniteLoading',
  props: {
    // 控制是否正在加载中
    loading: {
      type: Boolean,
      default: false
    },
    // 数据是否全部加载完成
    finished: {
      type: Boolean,
      default: false
    }
  },
  setup (props, { emit }) {
    const target = ref(null)
    useIntersectionObserver(target, ([{ isIntersecting }]) => {
      // target元素到达可视区
      if (isIntersecting) {
        // 触发加载事件条件：请求加载完成，数据加载完毕
        if (!props.loading && !props.finished) {
          emit('infinite')
        }
      }
    }, { threshold: 0 })
    return { target }
  }
}
</script>
<style lang="less" scoped>
.xtx-infinite-loading {
  .loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    .img {
      width: 50px;
      height: 50px;
      background: url(../../assets/images/load.gif) no-repeat center / contain;
    }
    .text {
      color: #999;
      font-size: 16px;
    }
  }
  .none {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    .img {
      width: 200px;
      height: 134px;
      background: url(../../assets/images/none.png) no-repeat center / contain;
    }
    .text {
      color: #999;
      font-size: 16px;
    }
  }
}
</style>

使用组件

<ul>
  <li v-for="goods in goodsList" :key="goods.id">
    <GoodsItem :goods="goods"></GoodsItem>
  </li>
</ul>
<!-- 加载组件 -->
<XtxInfiniteLoading :loading="loading" :finished="finished" @infinite="getData"></XtxInfiniteLoading>

setup () {
  const route = useRoute()
  // 加载中
  const loading = ref(false)
  // 是否加载完毕
  const finished = ref(false)
  const goodsList = ref([])
  // 请求参数
  let requestParams = {
    page: 1,
    pageSize: 20
  }
  const getData = () => {
    loading.value = true
    // 设置二级分类的id
    requestParams.categoryId = route.params.id
    findCategoryGoods(requestParams).then(({ result }) => {
      // 获取数据成功
      if (result.items.length) {
        goodsList.value.push(...result.items)
        // 追加完成把page改成下一页
        requestParams.page++
      } else {
        // 没有数据代表加载完成
        finished.value = true
      }
      loading.value = false
    })
  }
  // 在更改了二级分类后（路由）要重新加载goodsList数组
  watch(() => route.params.id, (newVal) => {
    if (newVal && `/category/sub/${route.params.id}` === route.path) {
      finished.value = false
      goodsList.value = []
      requestParams = {
        page: 1,
        pageSize: 20
      }
    }
  }, { immediate: true })
  return {
    getData,
    loading,
    finished,
    goodsList
  }
}