如何在Vue中实现类似微信聊天记录的滚动效果？

<div id="app">
  <div class="container" ref="chatListRef" @scroll="handleScroll">
    <ul>
      <li v-for="item in msgs" :key="item">{{ item }}</li>
    </ul>
  </div>
</div>

<script>
import { createApp, ref, onMounted, nextTick } from 'vue';

const app = createApp({
  setup() {
    const msgs = ref([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]); //初始消息
    const chatListRef = ref(null);
    let loading = ref(false); // 添加loading状态

    const loadMoreMessages = async () => {
      if (loading.value) return; // 防止重复加载
      loading.value = true;
      try {
        // 模拟加载更多消息
        const newMessages = Array.from({ length: 10 }, (_, i) => msgs.value.length + i + 1);
        msgs.value.unshift(...newMessages); // 将新消息添加到顶部
      } finally {
        loading.value = false;
      }
    };

    const handleScroll = async (event) => {
      const target = event.target;
      if (target.scrollTop <= 0 && !loading.value) {
        await loadMoreMessages();
        await nextTick(); // 等待DOM更新
        target.scrollTop += 100; // 调整滚动条位置，避免跳到顶部
      }
    };

    onMounted(() => {
      // 初始滚动到底部
      nextTick(() => {
        chatListRef.value.scrollTop = chatListRef.value.scrollHeight;
      });
    });

    return { msgs, chatListRef, handleScroll };
  },
});

app.mount('#app');
</script>

<style scoped>
* {
  margin: 0;
  padding: 0;
}
html, body {
  height: 100vh;
  background-color: #e9f5f8;
}
.container {
  width: 200px;
  height: 500px;
  overflow-y: auto;
  background-color: #FFF;
}
</style>