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vue实现无限滚动列表

2026-02-22 09:46:07VUE

实现无限滚动列表的核心思路

无限滚动列表的核心是通过监听滚动事件，动态加载数据。当用户滚动到列表底部附近时，触发数据加载函数，获取更多数据并追加到现有列表中。

使用Intersection Observer API

Intersection Observer API是现代浏览器提供的性能更好的滚动监听方案，相比传统滚动事件监听更高效。

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

<script>
export default {
  data() {
    return {
      items: [],
      page: 1,
      isLoading: false
    }
  },
  mounted() {
    this.loadItems()
    this.initIntersectionObserver()
  },
  methods: {
    initIntersectionObserver() {
      const observer = new IntersectionObserver((entries) => {
        if (entries[0].isIntersecting && !this.isLoading) {
          this.loadItems()
        }
      })
      observer.observe(this.$refs.loader)
    },
    async loadItems() {
      this.isLoading = true
      try {
        const newItems = await this.fetchItems(this.page)
        this.items = [...this.items, ...newItems]
        this.page++
      } finally {
        this.isLoading = false
      }
    },
    fetchItems(page) {
      // 模拟API调用
      return new Promise(resolve => {
        setTimeout(() => {
          const newItems = Array(10).fill().map((_, i) => ({
            id: page * 10 + i,
            content: `Item ${page * 10 + i}`
          }))
          resolve(newItems)
        }, 500)
      })
    }
  }
}
</script>

<style>
.list-container {
  height: 500px;
  overflow-y: auto;
}
.loader {
  padding: 10px;
  text-align: center;
}
</style>

使用传统滚动事件监听

对于需要支持旧浏览器的场景，可以使用传统滚动事件监听方式。

<template>
  <div class="list-container" ref="container">
    <div v-for="item in items" :key="item.id" class="list-item">
      {{ 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 container = this.$refs.container
      const { scrollTop, scrollHeight, clientHeight } = container
      const isBottom = scrollTop + clientHeight >= scrollHeight - 100

      if (isBottom && !this.isLoading) {
        this.loadItems()
      }
    },
    async loadItems() {
      this.isLoading = true
      try {
        const newItems = await this.fetchItems(this.page)
        this.items = [...this.items, ...newItems]
        this.page++
      } finally {
        this.isLoading = false
      }
    },
    fetchItems(page) {
      // 模拟API调用
      return new Promise(resolve => {
        setTimeout(() => {
          const newItems = Array(10).fill().map((_, i) => ({
            id: page * 10 + i,
            content: `Item ${page * 10 + i}`
          }))
          resolve(newItems)
        }, 500)
      })
    }
  }
}
</script>

使用第三方库vue-infinite-loading

对于更复杂的场景，可以使用专门的无限滚动库vue-infinite-loading。

安装依赖：

npm install vue-infinite-loading

使用示例：

<template>
  <div>
    <div v-for="item in items" :key="item.id" class="item">
      {{ 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 this.fetchItems(this.page)
        if (newItems.length) {
          this.items.push(...newItems)
          this.page++
          $state.loaded()
        } else {
          $state.complete()
        }
      } catch (e) {
        $state.error()
      }
    },
    fetchItems(page) {
      // 模拟API调用
      return new Promise(resolve => {
        setTimeout(() => {
          const newItems = Array(10).fill().map((_, i) => ({
            id: page * 10 + i,
            content: `Item ${page * 10 + i}`
          }))
          resolve(newItems)
        }, 500)
      })
    }
  }
}
</script>