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vue实现下拉加载

2026-02-24 06:35:30VUE

Vue 实现下拉加载的方法

使用 IntersectionObserver API

IntersectionObserver API 可以监听元素是否进入视口，适合实现下拉加载功能。

<template>
  <div>
    <div v-for="item in items" :key="item.id">{{ item.content }}</div>
    <div ref="loader" class="loader">Loading...</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: [],
      page: 1,
      isLoading: false
    }
  },
  mounted() {
    this.initObserver();
    this.loadItems();
  },
  methods: {
    initObserver() {
      const observer = new IntersectionObserver((entries) => {
        if (entries[0].isIntersecting && !this.isLoading) {
          this.loadMore();
        }
      });
      observer.observe(this.$refs.loader);
    },
    async loadItems() {
      this.isLoading = true;
      const newItems = await fetchItems(this.page);
      this.items = [...this.items, ...newItems];
      this.isLoading = false;
    },
    loadMore() {
      this.page++;
      this.loadItems();
    }
  }
}
</script>

使用滚动事件监听

通过监听滚动事件判断是否到达底部，触发加载更多数据。

<template>
  <div @scroll="handleScroll" class="scroll-container">
    <div v-for="item in items" :key="item.id">{{ item.content }}</div>
    <div v-if="isLoading" class="loader">Loading...</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: [],
      page: 1,
      isLoading: false
    }
  },
  mounted() {
    this.loadItems();
    window.addEventListener('scroll', this.handleScroll);
  },
  beforeDestroy() {
    window.removeEventListener('scroll', this.handleScroll);
  },
  methods: {
    handleScroll() {
      const scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
      const scrollHeight = document.documentElement.scrollHeight || document.body.scrollHeight;
      const clientHeight = document.documentElement.clientHeight || window.innerHeight;

      if (scrollTop + clientHeight >= scrollHeight - 100 && !this.isLoading) {
        this.loadMore();
      }
    },
    async loadItems() {
      this.isLoading = true;
      const newItems = await fetchItems(this.page);
      this.items = [...this.items, ...newItems];
      this.isLoading = false;
    },
    loadMore() {
      this.page++;
      this.loadItems();
    }
  }
}
</script>

使用第三方库

可以使用现成的 Vue 插件如 vue-infinite-loading 简化实现。

安装插件：

npm install vue-infinite-loading

使用示例：

<template>
  <div>
    <div v-for="item in items" :key="item.id">{{ item.content }}</div>
    <infinite-loading @infinite="loadMore"></infinite-loading>
  </div>
</template>

<script>
import InfiniteLoading from 'vue-infinite-loading';

export default {
  components: { InfiniteLoading },
  data() {
    return {
      items: [],
      page: 1
    }
  },
  methods: {
    async loadMore($state) {
      try {
        const newItems = await fetchItems(this.page);
        if (newItems.length) {
          this.items = [...this.items, ...newItems];
          this.page++;
          $state.loaded();
        } else {
          $state.complete();
        }
      } catch (error) {
        $state.error();
      }
    }
  }
}
</script>