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vue实现触底加载

2026-03-29 04:15:43VUE

触底加载的实现原理

触底加载的核心是监听滚动事件，判断页面是否滚动到底部。当滚动条接近底部时触发数据加载。Vue中可以通过结合v-infinite-scroll指令或手动监听滚动事件实现。

使用v-infinite-scroll指令（Element UI）

安装Element UI后，可直接使用其内置的无限滚动指令：

<template>
  <div 
    v-infinite-scroll="loadMore" 
    infinite-scroll-disabled="busy" 
    infinite-scroll-distance="100"
  >
    <div v-for="item in list" :key="item.id">{{ item.content }}</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      list: [],
      busy: false,
      page: 1
    }
  },
  methods: {
    loadMore() {
      this.busy = true;
      fetch(`/api/data?page=${this.page}`)
        .then(res => res.json())
        .then(data => {
          this.list.push(...data);
          this.page++;
          this.busy = false;
        });
    }
  }
}
</script>

手动实现滚动监听

如果没有使用UI库，可通过原生滚动监听实现：

<template>
  <div class="scroll-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 { scrollTop, clientHeight, scrollHeight } = e.target;
      const threshold = 100;
      if (scrollHeight - (scrollTop + clientHeight) < threshold && !this.loading) {
        this.loadMore();
      }
    },
    loadMore() {
      this.loading = true;
      fetch(`/api/data?page=${this.page}`)
        .then(res => res.json())
        .then(data => {
          this.list.push(...data);
          this.page++;
          this.loading = false;
        });
    }
  }
}
</script>

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

使用Intersection Observer API

现代浏览器支持更高效的交叉观察器API：

vue实现触底加载

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

<script>
export default {
  data() {
    return {
      list: [],
      hasMore: true,
      page: 1,
      observer: null
    }
  },
  mounted() {
    this.observer = new IntersectionObserver(entries => {
      if (entries[0].isIntersecting && this.hasMore) {
        this.loadMore();
      }
    });
    this.observer.observe(this.$refs.loader);
  },
  beforeDestroy() {
    this.observer.disconnect();
  },
  methods: {
    loadMore() {
      fetch(`/api/data?page=${this.page}`)
        .then(res => res.json())
        .then(data => {
          if (data.length === 0) this.hasMore = false;
          this.list.push(...data);
          this.page++;
        });
    }
  }
}
</script>