IntersectionObserver 实现无限滚动

observerInfiniteScroll.vue

<template>
  <div>
    <ul>
      <li class="list-item" v-for="item in items" :key="item.id">{{item.title}}</li>
    </ul>
    <Observer @intersect="intersected" />
  </div>
</template>
 <script>
import Observer from 'src/components/observer/observer';
import axios from 'axios';
export default {
  data: () => ({ page: 1, items: [] }),
  components: {
    Observer,
  },
  methods: {
    async intersected() {
      await axios
        .get('https://cnodejs.org/api/v1/topics', {
          params: {
            page: this.page,
            limit: 20,
          },
        })
        .then(res => {
          this.page++;
          this.items = [...this.items, ...res.data.data];
        });
    },
  },
};
</script>
<style lang="scss">
.list-item {
  padding: 0.3rem;
}
</style>

observer.vue

<template>
  <div class="observer" />
</template>
<script>
export default {
  props: ['options'],
  data: () => ({ observer: null }),
  mounted() {
    const options = this.options || {};
    this.observer = new IntersectionObserver(([entry]) => {
      if (entry && entry.isIntersecting) {
        this.$emit('intersect');
      }
    }, options);
    this.observer.observe(this.$el);
  },
  destroyed() {
    this.observer.disconnect();
  },
};
</script>

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