提示词保存
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@@ -3,7 +3,7 @@
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</template>
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<script setup>
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import { ref, watch, computed } from 'vue'
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import { ref, watch, onUnmounted } from 'vue'
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import { renderMarkdown } from '@/utils/markdown'
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const props = defineProps({
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@@ -17,196 +17,152 @@ const props = defineProps({
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}
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})
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// 已完成的 chunks(包含已渲染的 HTML)
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const chunks = ref([])
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// chunk ID 计数器
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const chunkIdCounter = ref(0)
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// 当前显示的内容(用于打字机效果)
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const displayedContent = ref('')
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// 目标内容(完整内容)
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const targetContent = ref('')
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// 动画帧 ID
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let animationFrameId = null
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// 打字机速度(字符/帧,可根据性能调整)
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const TYPING_SPEED = 3
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// 是否正在执行打字机动画
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const isTyping = ref(false)
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/**
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* 创建 chunk 对象(包含预渲染的 HTML)
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* 高性能打字机效果渲染
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* 使用 requestAnimationFrame 实现平滑的逐字符显示
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*/
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function createChunk(text) {
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return {
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id: chunkIdCounter.value++,
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text: text.trim(),
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rendered: renderMarkdown(text.trim()) // 预渲染,避免重复渲染
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}
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}
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/**
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* 智能分块:业界成熟方案
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*/
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function splitIntoChunks(text) {
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if (!text || !text.trim()) return []
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function typewriterEffect() {
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if (!isTyping.value) return
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const result = []
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const currentLength = displayedContent.value.length
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const targetLength = targetContent.value.length
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// 第一级:按段落分割(双换行)
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const paragraphs = text.split(/\n\s*\n/)
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for (const paragraph of paragraphs) {
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if (!paragraph.trim()) continue
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// 如果段落长度适中(< 500字符),直接作为一个 chunk
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if (paragraph.trim().length < 500) {
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result.push(createChunk(paragraph))
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continue
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}
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// 第二级:段落太长,按句子分割
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const sentences = paragraph.split(/([。!?.!?]\s*)/)
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let currentChunk = ''
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for (let i = 0; i < sentences.length; i++) {
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currentChunk += sentences[i]
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// 如果累积的句子达到一定长度(> 300字符),创建一个 chunk
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if (currentChunk.trim().length > 300) {
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result.push(createChunk(currentChunk))
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currentChunk = ''
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}
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}
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// 处理剩余的文本
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if (currentChunk.trim()) {
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if (currentChunk.trim().length > 500) {
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// 第三级:按固定长度分割
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const fixedLength = 400
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let start = 0
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while (start < currentChunk.length) {
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const end = Math.min(start + fixedLength, currentChunk.length)
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const chunkText = currentChunk.slice(start, end).trim()
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if (chunkText) {
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result.push(createChunk(chunkText))
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}
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start = end
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}
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} else {
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result.push(createChunk(currentChunk))
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}
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}
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}
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return result
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}
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/**
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* 计算流式传输中的文本
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*/
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const streamingText = computed(() => {
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if (!props.isStreaming || !props.content) return ''
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const text = props.content
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// 优先查找最后一个段落分隔符
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const lastParagraphIndex = text.lastIndexOf('\n\n')
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if (lastParagraphIndex !== -1) {
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return text.slice(lastParagraphIndex + 2)
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}
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// 查找最后一个句子结束符
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const lastSentenceMatch = text.match(/([。!?.!?]\s*)(?!.*[。!?.!?]\s*)/)
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if (lastSentenceMatch) {
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return text.slice(lastSentenceMatch.index + lastSentenceMatch[0].length)
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}
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// 全部作为流式文本
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return text
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})
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/**
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* 计算最终渲染的内容(合并所有 chunks 和流式文本)
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*/
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const renderedContent = computed(() => {
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let html = ''
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// 添加已完成的 chunks
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for (const chunk of chunks.value) {
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html += chunk.rendered
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}
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// 添加流式传输中的文本
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if (props.isStreaming && streamingText.value) {
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html += renderMarkdown(streamingText.value)
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}
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return html
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})
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/**
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* 增量更新 chunks(避免全量重新渲染)
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*/
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function updateChunksIncremental(content) {
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if (!content) {
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chunks.value = []
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if (currentLength >= targetLength) {
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// 已完成,停止动画
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isTyping.value = false
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displayedContent.value = targetContent.value
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return
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}
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const text = content
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// 每次增加多个字符以提高性能
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const nextLength = Math.min(currentLength + TYPING_SPEED, targetLength)
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displayedContent.value = targetContent.value.slice(0, nextLength)
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// 查找最后一个段落分隔符
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const lastParagraphIndex = text.lastIndexOf('\n\n')
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let completedText = ''
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if (lastParagraphIndex !== -1) {
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completedText = text.slice(0, lastParagraphIndex)
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} else {
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// 没有段落分隔符,查找最后一个句子结束符
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const lastSentenceMatch = text.match(/([。!?.!?]\s*)(?!.*[。!?.!?]\s*)/)
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if (lastSentenceMatch && lastSentenceMatch.index > 300) {
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completedText = text.slice(0, lastSentenceMatch.index + lastSentenceMatch[0].length)
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} else {
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// 流式传输中,还没有完整的段落或句子
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return
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}
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}
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// 分割已完成的文本
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const newChunks = splitIntoChunks(completedText)
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// 增量更新:只添加新的 chunks,保留已存在的
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if (newChunks.length > chunks.value.length) {
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// 只添加新增的 chunks
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const existingTexts = new Set(chunks.value.map(c => c.text))
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for (let i = chunks.value.length; i < newChunks.length; i++) {
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if (!existingTexts.has(newChunks[i].text)) {
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chunks.value.push(newChunks[i])
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}
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}
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}
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// 继续下一帧
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animationFrameId = requestAnimationFrame(typewriterEffect)
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}
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/**
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* 开始打字机效果
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*/
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function startTypewriter() {
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if (animationFrameId) {
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cancelAnimationFrame(animationFrameId)
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}
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isTyping.value = true
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animationFrameId = requestAnimationFrame(typewriterEffect)
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}
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/**
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* 停止打字机效果
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*/
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function stopTypewriter() {
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if (animationFrameId) {
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cancelAnimationFrame(animationFrameId)
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animationFrameId = null
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}
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isTyping.value = false
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}
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/**
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* 计算渲染的 HTML 内容
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*/
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const renderedContent = ref('')
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/**
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* 更新渲染内容
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*/
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function updateRenderedContent() {
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const content = displayedContent.value
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if (!content) {
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renderedContent.value = ''
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return
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}
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// 渲染 markdown 为 HTML
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renderedContent.value = renderMarkdown(content)
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}
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// 监听 displayedContent 变化,更新渲染
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watch(displayedContent, () => {
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updateRenderedContent()
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}, { immediate: true })
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/**
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* 处理内容更新
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*/
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function updateChunks(content) {
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if (!content) {
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chunks.value = []
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function handleContentUpdate(newContent) {
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if (!newContent) {
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targetContent.value = ''
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displayedContent.value = ''
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stopTypewriter()
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return
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}
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// 更新目标内容
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targetContent.value = newContent
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if (props.isStreaming) {
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// 流式模式:增量更新
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updateChunksIncremental(content)
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// 流式传输模式:使用打字机效果显示内容
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// 流式传输时,内容会逐步到达,使用打字机效果增强体验
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const currentLength = displayedContent.value.length
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const newLength = newContent.length
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if (newLength !== currentLength) {
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// 内容发生变化
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if (newLength < currentLength) {
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// 内容被重置或缩短,直接显示新内容
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displayedContent.value = newContent
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stopTypewriter()
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} else {
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// 内容增加,使用打字机效果显示新增部分
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if (!isTyping.value) {
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startTypewriter()
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}
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}
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}
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} else {
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// 非流式模式:完整分割
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chunks.value = splitIntoChunks(content)
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// 静态内容模式:直接显示全部内容,不使用打字机效果
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displayedContent.value = newContent
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stopTypewriter()
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}
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}
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// 监听 content 变化
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watch(() => props.content, (newContent) => {
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updateChunks(newContent)
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handleContentUpdate(newContent)
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}, { immediate: true })
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// 监听 isStreaming 变化:流式结束时处理最后一个未完成的块
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// 监听 isStreaming 变化
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watch(() => props.isStreaming, (newVal, oldVal) => {
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if (!newVal && oldVal && props.content) {
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// 流式结束,完整重新分割
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const newChunks = splitIntoChunks(props.content)
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chunks.value = newChunks
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if (!newVal && oldVal) {
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// 流式传输结束,确保显示完整内容,停止打字机效果
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if (targetContent.value) {
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displayedContent.value = targetContent.value
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}
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stopTypewriter()
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} else if (newVal) {
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// 开始流式传输,如果内容有变化,启动打字机效果
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// 打字机效果会在 handleContentUpdate 中根据内容变化自动启动
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}
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})
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// 组件卸载时清理
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onUnmounted(() => {
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stopTypewriter()
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})
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</script>
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<style scoped>
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