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vue实现触底加载

2026-01-16 03:48:50VUE

触底加载的实现方法

在Vue中实现触底加载功能，可以通过监听滚动事件或使用Intersection Observer API来实现。以下是两种常见的方法：

监听滚动事件

在组件中监听滚动事件，计算滚动位置判断是否触底。

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

<script>
export default {
  data() {
    return {
      list: [],
      loading: false,
      page: 1
    }
  },
  methods: {
    handleScroll(e) {
      const container = e.target
      const scrollHeight = container.scrollHeight
      const scrollTop = container.scrollTop
      const clientHeight = container.clientHeight

      if (scrollHeight - scrollTop <= clientHeight + 50 && !this.loading) {
        this.loadMore()
      }
    },
    loadMore() {
      this.loading = true
      // 模拟异步加载数据
      setTimeout(() => {
        const newData = Array(10).fill(0).map((_, i) => ({
          id: this.list.length + i,
          content: `内容 ${this.list.length + i}`
        }))
        this.list = [...this.list, ...newData]
        this.page++
        this.loading = false
      }, 1000)
    }
  },
  mounted() {
    this.loadMore()
  }
}
</script>

<style>
.container {
  height: 500px;
  overflow-y: auto;
}
</style>

使用Intersection Observer API

这种方法更现代，性能更好，不需要频繁计算滚动位置。

<template>
  <div class="container">
    <div v-for="item in list" :key="item.id">{{ item.content }}</div>
    <div ref="loader" v-if="!finished">{{ loading ? '加载中...' : '' }}</div>
    <div v-if="finished">没有更多了</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      list: [],
      loading: false,
      page: 1,
      finished: false
    }
  },
  methods: {
    initObserver() {
      const observer = new IntersectionObserver((entries) => {
        if (entries[0].isIntersecting && !this.loading && !this.finished) {
          this.loadMore()
        }
      })
      observer.observe(this.$refs.loader)
    },
    loadMore() {
      this.loading = true
      // 模拟异步加载数据
      setTimeout(() => {
        const newData = Array(10).fill(0).map((_, i) => ({
          id: this.list.length + i,
          content: `内容 ${this.list.length + i}`
        }))
        this.list = [...this.list, ...newData]
        this.page++
        this.loading = false

        // 模拟数据加载完毕
        if (this.page > 5) {
          this.finished = true
        }
      }, 1000)
    }
  },
  mounted() {
    this.loadMore()
    this.initObserver()
  }
}
</script>

<style>
.container {
  height: 500px;
  overflow-y: auto;
}
</style>

使用第三方库

也可以使用现成的Vue指令或组件来实现触底加载，例如：

npm install vue-infinite-loading

使用示例：

<template>
  <div class="container">
    <div v-for="item in list" :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 {
      list: [],
      page: 1
    }
  },
  methods: {
    loadMore($state) {
      setTimeout(() => {
        const newData = Array(10).fill(0).map((_, i) => ({
          id: this.list.length + i,
          content: `内容 ${this.list.length + i}`
        }))
        this.list = [...this.list, ...newData]
        this.page++

        if (this.page > 5) {
          $state.complete()
        } else {
          $state.loaded()
        }
      }, 1000)
    }
  },
  mounted() {
    this.loadMore()
  }
}
</script>