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vue怎么实现滚动加载

2026-01-21 11:21:49VUE

滚动加载的实现方法

在Vue中实现滚动加载通常结合IntersectionObserver或监听滚动事件，动态加载数据。以下是两种常见实现方式：

使用IntersectionObserver API

IntersectionObserver是现代浏览器提供的API，性能优于传统滚动事件监听。

<template>
  <div>
    <div v-for="item in items" :key="item.id">{{ item.content }}</div>
    <div ref="loader" v-if="!isFinished">加载中...</div>
  </div>
</template>

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

使用滚动事件监听

传统方法通过计算滚动位置判断是否需要加载。

<template>
  <div ref="scrollContainer" @scroll="handleScroll">
    <div v-for="item in items" :key="item.id">{{ item.content }}</div>
    <div v-if="loading">加载中...</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: [],
      page: 1,
      loading: false,
      isFinished: false
    }
  },
  mounted() {
    this.loadItems();
  },
  methods: {
    handleScroll() {
      const container = this.$refs.scrollContainer;
      const scrollBottom = container.scrollHeight - container.scrollTop - container.clientHeight;
      if (scrollBottom < 100 && !this.loading && !this.isFinished) {
        this.loadItems();
      }
    },
    async loadItems() {
      this.loading = true;
      const newItems = await fetch(`/api/items?page=${this.page}`);
      this.loading = false;

      if (newItems.length === 0) {
        this.isFinished = true;
        return;
      }
      this.items = [...this.items, ...newItems];
      this.page++;
    }
  }
}
</script>