perf: 优化版本
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@@ -54,7 +54,7 @@
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</template>
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<script setup lang="ts">
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import { ref, nextTick, onMounted, onUnmounted, watch } from 'vue';
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import { ref, nextTick, onMounted, onUnmounted } from 'vue';
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interface MessageItem {
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key?: number;
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@@ -81,6 +81,7 @@ const autoScroll = ref(true); // 是否自动滚动到底部
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const isUserScrolling = ref(false); // 用户是否正在手动滚动
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let scrollTimeout: any = null;
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let mutationObserver: MutationObserver | null = null;
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let scrollRAF: number | null = null; // 用于存储 requestAnimationFrame ID
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/**
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* 检查是否滚动到底部
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@@ -93,15 +94,29 @@ function isScrolledToBottom(): boolean {
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}
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/**
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* 平滑滚动到底部(不使用 smooth 行为,避免跳动)
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* 立即滚动到底部(用于内容快速变化时)
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*/
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function scrollToBottomImmediate() {
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if (!scrollContainer.value || !autoScroll.value) return;
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scrollContainer.value.scrollTop = scrollContainer.value.scrollHeight;
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}
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/**
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* 平滑滚动到底部(使用 RAF 避免过度调用)
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*/
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function scrollToBottomSmooth() {
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if (!scrollContainer.value || !autoScroll.value) return;
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requestAnimationFrame(() => {
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// 取消之前的 RAF,避免重复调用
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if (scrollRAF !== null) {
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cancelAnimationFrame(scrollRAF);
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}
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scrollRAF = requestAnimationFrame(() => {
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if (scrollContainer.value) {
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scrollContainer.value.scrollTop = scrollContainer.value.scrollHeight;
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}
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scrollRAF = null;
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});
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}
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@@ -159,10 +174,21 @@ function observeContentChanges() {
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if (!contentElement) return;
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// 创建 MutationObserver 监听内容变化
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mutationObserver = new MutationObserver(() => {
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mutationObserver = new MutationObserver((mutations) => {
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// 如果启用了自动滚动且用户没有在滚动,则滚动到底部
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if (autoScroll.value && !isUserScrolling.value) {
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scrollToBottomSmooth();
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// 检查是否有文本内容变化(characterData),这通常是 SSE 流式输出
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const hasCharacterDataChange = mutations.some(
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mutation => mutation.type === 'characterData'
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);
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if (hasCharacterDataChange) {
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// SSE 流式输出时使用立即滚动,避免跳动
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scrollToBottomImmediate();
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} else {
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// 其他情况使用平滑滚动
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scrollToBottomSmooth();
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}
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}
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});
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@@ -175,20 +201,6 @@ function observeContentChanges() {
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});
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}
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// 监听列表变化
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watch(
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() => props.list,
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() => {
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// 列表变化时,如果启用了自动滚动,滚动到底部
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if (autoScroll.value) {
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nextTick(() => {
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scrollToBottomSmooth();
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});
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}
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},
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{ deep: true }
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);
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// 组件挂载时初始化
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onMounted(() => {
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if (scrollContainer.value) {
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@@ -211,6 +223,9 @@ onUnmounted(() => {
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if (scrollTimeout) {
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clearTimeout(scrollTimeout);
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}
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if (scrollRAF !== null) {
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cancelAnimationFrame(scrollRAF);
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}
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if (mutationObserver) {
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mutationObserver.disconnect();
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}
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