From 3e87048a30a4f27491afecb2cec25931dc860e86 Mon Sep 17 00:00:00 2001
From: xiaoqidun <xiaoqidun@gmail.com>
Date: Mon, 14 Sep 2026 12:11:53 +0800
Subject: [PATCH] =?UTF-8?q?feat(=E6=96=87=E6=A1=A3=E5=AF=BC=E5=87=BA):=20?=
 =?UTF-8?q?=E6=94=AF=E6=8C=81=E6=8C=87=E5=AE=9A=E9=A1=B5=E5=AF=BC=E5=87=BA?=
 =?UTF-8?q?=EF=BC=8C=E7=BB=9F=E4=B8=80=E6=96=87=E4=BB=B6=E7=BC=96=E5=8F=B7?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 assets/webui/index.html  |  24 ++++++++-
 assets/webui/ofdgo.css   | 109 +++++++++++++++++++++++++++++++++++++++
 assets/webui/ofdgo.js    |  77 ++++++++++++++++++++++++---
 internal/webui/wasm.go   |  28 +++++++++-
 internal/webui/webui.go  |  15 +++---
 ofdgo_page_range.go      |  79 ++++++++++++++++++++++++++++
 ofdgo_renderer_output.go |  32 ++++++------
 ofdgo_renderer_pdf.go    |   4 +-
 8 files changed, 336 insertions(+), 32 deletions(-)
 create mode 100644 ofdgo_page_range.go

diff --git a/assets/webui/index.html b/assets/webui/index.html
index 5d0100f..3997ba3 100644
--- a/assets/webui/index.html
+++ b/assets/webui/index.html
@@ -50,9 +50,29 @@
 					<option value="600">600</option>
 				</select>
 				<button id="exportPageButton" class="button" type="button" data-short="单" title="导出单页" aria-label="导出单页" disabled>单页</button>
-				<button id="exportButton" class="button" type="button" data-short="全" title="导出文档" aria-label="导出文档" disabled>文档</button>
+				<button id="exportButton" class="button" type="button" data-short="档" title="导出文档" aria-label="导出文档" aria-haspopup="dialog" popovertarget="exportPanel" disabled>文档</button>
 			</div>
 		</header>
+		<div id="exportPanel" class="export-panel" popover role="dialog" aria-label="导出文档">
+			<form id="exportForm">
+				<div class="export-row">
+					<span id="exportScopeLabel">范围</span>
+					<div class="export-options" role="radiogroup" aria-labelledby="exportScopeLabel">
+						<label><input id="exportAll" type="radio" name="scope" value="all" checked autofocus><span>全部</span></label>
+						<label><input id="exportSpecified" type="radio" name="scope" value="specified"><span>指定</span></label>
+					</div>
+				</div>
+				<div id="exportRangeRow" class="export-row" hidden>
+					<label for="exportRange">页码</label>
+					<input id="exportRange" type="text" aria-describedby="exportRangeStatus" autocomplete="off" spellcheck="false">
+				</div>
+				<div class="export-actions">
+					<div id="exportRangeStatus" class="export-range-status" role="status" aria-live="polite"></div>
+					<button class="button" type="button" popovertarget="exportPanel" popovertargetaction="hide">取消</button>
+					<button id="exportSubmit" class="button" type="submit">导出</button>
+				</div>
+			</form>
+		</div>
 
 		<main class="workspace">
 			<aside class="page-list-panel">
@@ -70,7 +90,7 @@
 						<button type="submit" class="button">搜索</button>
 					</form>
 					<div class="search-tools">
-						<span id="searchStatus" role="status" aria-live="polite">输入文字</span>
+						<span id="searchStatus" role="status" aria-live="polite"></span>
 						<span id="searchCount">0 / 0</span>
 						<button id="searchPrev" type="button" class="icon-button arrow-prev" title="上一处" aria-label="上一处" aria-keyshortcuts="Shift+F3" disabled></button>
 						<button id="searchNext" type="button" class="icon-button arrow-next" title="下一处" aria-label="下一处" aria-keyshortcuts="F3" disabled></button>
diff --git a/assets/webui/ofdgo.css b/assets/webui/ofdgo.css
index 95874b9..144a695 100644
--- a/assets/webui/ofdgo.css
+++ b/assets/webui/ofdgo.css
@@ -256,6 +256,109 @@ button:not(:disabled):hover {
 	width: 54px;
 }
 
+.export-panel {
+	top: calc(var(--bar-height) + 8px);
+	right: 0;
+	bottom: auto;
+	left: auto;
+	width: var(--sidebar-width);
+	max-height: calc(100dvh - var(--bar-height) - 18px);
+	margin: 0;
+	padding: 12px;
+	border: 1px solid var(--line);
+	background: var(--panel);
+	color: #1f2428;
+	box-shadow: var(--shadow-soft);
+	font-size: 14px;
+}
+
+.export-row {
+	display: grid;
+	grid-template-columns: 2em minmax(0, 1fr);
+	align-items: center;
+	gap: 12px;
+	margin-bottom: 12px;
+}
+
+.export-options {
+	display: flex;
+}
+
+.export-options label {
+	position: relative;
+	flex: 1;
+	cursor: pointer;
+}
+
+.export-options input {
+	position: absolute;
+	opacity: 0;
+}
+
+.export-options span {
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	height: var(--control-height);
+	border: 1px solid var(--line);
+	background: #ffffff;
+}
+
+.export-options label + label span {
+	border-left: 0;
+}
+
+.export-options input:checked + span {
+	background: #e4f3ef;
+	color: var(--accent-strong);
+	box-shadow: 0 0 0 1px var(--accent) inset;
+}
+
+.export-options input:focus-visible + span {
+	outline: 2px solid var(--focus);
+	outline-offset: 2px;
+}
+
+.export-row input[type="text"] {
+	width: 100%;
+	min-width: 0;
+	height: var(--control-height);
+	padding: 0 6px;
+	border: 1px solid var(--line);
+	border-radius: 0;
+	background: #ffffff;
+	color: #1f2428;
+}
+
+.export-row input[aria-invalid="true"] {
+	border-color: #b14343;
+}
+
+.export-range-status {
+	min-width: 0;
+	color: var(--text-muted);
+	font-size: 12px;
+	font-variant-numeric: tabular-nums;
+	overflow-wrap: anywhere;
+}
+
+.export-actions {
+	display: grid;
+	grid-template-columns: minmax(0, 1fr) auto auto;
+	align-items: center;
+	gap: 8px;
+}
+
+#exportSubmit {
+	border-color: var(--accent);
+	background: var(--accent);
+	color: #ffffff;
+}
+
+#exportSubmit:not(:disabled):hover {
+	background: var(--accent-strong);
+}
+
 .format-select:focus,
 .format-select:focus-visible {
 	border-color: var(--accent);
@@ -691,6 +794,7 @@ button.outline-link:hover {
 .empty-state[hidden],
 .meta-list > [hidden],
 .navigation-tabs[hidden],
+.export-row[hidden],
 .page-list[hidden],
 .page-frame[hidden],
 .progress-panel[hidden] {
@@ -1326,6 +1430,11 @@ button.outline-link:hover {
 		--sidebar-width: min(78vw, 292px);
 	}
 
+	.export-panel {
+		right: 10px;
+		width: min(300px, calc(100% - 20px));
+	}
+
 	.toolbar {
 		--tool-gap: 6px;
 	}
diff --git a/assets/webui/ofdgo.js b/assets/webui/ofdgo.js
index 3eabee4..b71762d 100644
--- a/assets/webui/ofdgo.js
+++ b/assets/webui/ofdgo.js
@@ -66,6 +66,7 @@ const state = {
 	thumbnailObserver: null,
 	visibleThumbnails: new Set(),
 	exportFormats: [],
+	exportPages: null,
 	showPages: !COMPACT_LAYOUT.matches,
 	showMeta: !COMPACT_LAYOUT.matches,
 };
@@ -97,6 +98,14 @@ const el = {
 	exportFormat: document.querySelector("#exportFormat"),
 	exportPageButton: document.querySelector("#exportPageButton"),
 	exportButton: document.querySelector("#exportButton"),
+	exportPanel: document.querySelector("#exportPanel"),
+	exportForm: document.querySelector("#exportForm"),
+	exportAll: document.querySelector("#exportAll"),
+	exportSpecified: document.querySelector("#exportSpecified"),
+	exportRangeRow: document.querySelector("#exportRangeRow"),
+	exportRange: document.querySelector("#exportRange"),
+	exportRangeStatus: document.querySelector("#exportRangeStatus"),
+	exportSubmit: document.querySelector("#exportSubmit"),
 	emptyState: document.querySelector("#emptyState"),
 	progressPanel: document.querySelector("#progressPanel"),
 	progressLabel: document.querySelector("#progressLabel"),
@@ -201,7 +210,19 @@ document.addEventListener("selectionchange", () => {
 });
 el.exportFormat.addEventListener("change", () => updateDPIControl());
 el.exportPageButton.addEventListener("click", () => exportFile(false));
-el.exportButton.addEventListener("click", () => exportFile(true));
+el.exportPanel.addEventListener("beforetoggle", prepareExportPanel);
+el.exportAll.addEventListener("change", updateExportRange);
+el.exportSpecified.addEventListener("change", () => {
+	updateExportRange();
+	el.exportRange.focus();
+});
+el.exportRange.addEventListener("input", updateExportRange);
+el.exportForm.addEventListener("submit", (event) => {
+	event.preventDefault();
+	if (!el.exportSubmit.disabled) {
+		return exportFile(true, state.exportPages);
+	}
+});
 el.refreshAppButton.addEventListener("click", refreshApplication);
 el.pageInput.addEventListener("change", () => {
 	const page = Number.parseInt(el.pageInput.value, 10);
@@ -254,7 +275,7 @@ updateSidebarState();
 boot();
 
 function handleKeyDown(event) {
-	if (event.defaultPrevented || event.isComposing || event.altKey || document.body.hasAttribute("aria-busy")) {
+	if (event.defaultPrevented || event.isComposing || event.altKey || document.body.hasAttribute("aria-busy") || el.exportPanel.matches(":popover-open")) {
 		return;
 	}
 	const key = event.key;
@@ -1487,7 +1508,48 @@ async function downloadAttachment(attachment) {
 	}
 }
 
-async function exportFile(whole) {
+function prepareExportPanel(event) {
+	if (event.newState !== "open") {
+		return;
+	}
+	if (!state.doc || document.body.hasAttribute("aria-busy")) {
+		event.preventDefault();
+		return;
+	}
+	el.exportForm.reset();
+	updateExportRange();
+}
+
+async function updateExportRange() {
+	const specified = el.exportSpecified.checked;
+	const value = el.exportRange.value.trim();
+	const openSeq = state.openSeq;
+	state.exportPages = null;
+	el.exportRangeRow.hidden = !specified;
+	el.exportRange.removeAttribute("aria-invalid");
+	el.exportSubmit.disabled = specified;
+	el.exportRangeStatus.textContent = specified && value ? "正在校验" : "";
+	if (!specified || !value) {
+		return;
+	}
+	const current = () => openSeq === state.openSeq && el.exportPanel.matches(":popover-open")
+		&& el.exportSpecified.checked && value === el.exportRange.value.trim();
+	try {
+		const indices = await callWASM("ofdgoParsePageRange", value);
+		if (current()) {
+			state.exportPages = indices;
+			el.exportSubmit.disabled = false;
+			el.exportRangeStatus.textContent = `共 ${indices.length} 页`;
+		}
+	} catch {
+		if (current()) {
+			el.exportRange.setAttribute("aria-invalid", "true");
+			el.exportRangeStatus.textContent = "页码无效";
+		}
+	}
+}
+
+async function exportFile(whole, indices = null) {
 	if (!state.doc || document.body.hasAttribute("aria-busy")) {
 		return;
 	}
@@ -1514,7 +1576,7 @@ async function exportFile(whole) {
 			return;
 		}
 		const result = whole
-			? await callWASM("ofdgoExportDocument", format.value, dpi, file)
+			? await callWASM("ofdgoExportDocument", format.value, dpi, indices, file)
 			: await callWASM("ofdgoExportPage", pageIndex, format.value, dpi, file);
 		if (openSeq !== state.openSeq) {
 			return;
@@ -2124,7 +2186,7 @@ function resetSearch(clearInput = true) {
 	if (clearInput) {
 		el.searchInput.value = "";
 	}
-	el.searchStatus.textContent = "输入文字";
+	el.searchStatus.textContent = "";
 	el.searchResults.replaceChildren();
 	updateSearchCount();
 	clearSearchHighlights();
@@ -3260,6 +3322,9 @@ function setBusy(busy, text = "", percent = 0, status = "") {
 		}
 		return;
 	}
+	if (el.exportPanel.matches(":popover-open")) {
+		el.exportPanel.hidePopover();
+	}
 	endPan();
 	el.progressPanel.hidden = false;
 	setProgress(text, percent, status);
@@ -3317,7 +3382,7 @@ function baseFileName() {
 
 function pageFileName(extension) {
 	const page = String(state.pageIndex + 1).padStart(String(state.doc?.pageCount || 1).length, "0");
-	return `${baseFileName()}_p${page}.${extension}`;
+	return `${baseFileName()}_${page}.${extension}`;
 }
 
 function exportFormatInfo(value) {
diff --git a/internal/webui/wasm.go b/internal/webui/wasm.go
index 8850d72..15e32a8 100644
--- a/internal/webui/wasm.go
+++ b/internal/webui/wasm.go
@@ -21,6 +21,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"syscall/js"
+
+	"github.com/xiaoqidun/ofdgo"
 )
 
 // exportWriter 分块传递导出数据
@@ -74,6 +76,7 @@ func RunWASM() {
 	registerCallback("ofdgoSVGFontData", svgFontData)
 	registerCallback("ofdgoSearchPage", searchPage)
 	registerCallback("ofdgoExportFormats", exportFormats)
+	registerCallback("ofdgoParsePageRange", parsePageRange)
 	registerExportCallback("ofdgoExportPage", exportPage)
 	registerExportCallback("ofdgoExportDocument", exportDocument)
 	registerCallback("ofdgoMatchFontFiles", matchFontFiles)
@@ -287,6 +290,20 @@ func exportFormats(args []js.Value) (any, error) {
 	return ExportFormats(), nil
 }
 
+// parsePageRange 解析当前文档的导出页码
+// 入参: args 浏览器参数
+// 返回: any 页面索引, error 错误信息
+func parsePageRange(args []js.Value) (any, error) {
+	if currentSession == nil {
+		return nil, fmt.Errorf("ofd document is not opened")
+	}
+	count, err := currentSession.Reader.PageCount()
+	if err != nil {
+		return nil, err
+	}
+	return ofdgo.ParsePageRange(args[0].String(), count)
+}
+
 // exportPage 导出OFD单页
 // 入参: args 浏览器参数
 // 返回: any 导出结果, error 错误信息
@@ -318,8 +335,15 @@ func exportDocument(args []js.Value) (any, error) {
 	if currentSession == nil {
 		return nil, fmt.Errorf("ofd document is not opened")
 	}
-	writer := bufio.NewWriterSize(exportWriter{write: args[2]}, 1<<20)
-	format, err := currentSession.ExportDocument(args[0].String(), args[1].Float(), writer)
+	var indices []int
+	if !args[2].IsNull() {
+		indices = make([]int, args[2].Length())
+		for i := range indices {
+			indices[i] = args[2].Index(i).Int()
+		}
+	}
+	writer := bufio.NewWriterSize(exportWriter{write: args[3]}, 1<<20)
+	format, err := currentSession.ExportDocument(args[0].String(), args[1].Float(), writer, indices...)
 	if err != nil {
 		return nil, err
 	}
diff --git a/internal/webui/webui.go b/internal/webui/webui.go
index 9683d2e..2559300 100644
--- a/internal/webui/webui.go
+++ b/internal/webui/webui.go
@@ -614,15 +614,15 @@ func signatureStampInfos(positions []ofdgo.SignatureStampPosition) []SignatureSt
 }
 
 // ExportDocument 导出文档为PDF或逐页打包ZIP
-// 入参: value 导出格式, dpi 图片DPI, writer 输出流
+// 入参: value 导出格式, dpi 图片DPI, writer 输出流, indices 零基页面索引，省略则全部
 // 返回: ExportFormat 导出格式, error 错误信息
-func (s *Session) ExportDocument(value string, dpi float64, writer io.Writer) (ExportFormat, error) {
+func (s *Session) ExportDocument(value string, dpi float64, writer io.Writer, indices ...int) (ExportFormat, error) {
 	format, ok := exportFormat(value)
 	if !ok {
 		return ExportFormat{}, fmt.Errorf("unsupported export format %s", value)
 	}
 	if format.Value == "pdf" {
-		return format, s.ExportPDF(writer)
+		return format, s.ExportPDF(writer, indices...)
 	}
 	if s == nil || s.Reader == nil || s.Renderer == nil || s.doc == nil {
 		return ExportFormat{}, fmt.Errorf("ofd document is not opened")
@@ -631,17 +631,20 @@ func (s *Session) ExportDocument(value string, dpi float64, writer io.Writer) (E
 	if dpi > 0 && (format.Value == "png" || format.Value == "jpg") {
 		renderer.DPI = dpi
 	}
-	err := renderer.RenderToZIP(writer, format.Value)
+	err := renderer.RenderToZIP(writer, format.Value, indices...)
 	return ExportFormat{Value: "zip", Label: "ZIP", Extension: "zip", MIME: "application/zip"}, err
 }
 
 // ExportPDF 导出文档为PDF
-// 入参: writer 输出流
+// 入参: writer 输出流, indices 零基页面索引，省略则全部
 // 返回: error 错误信息
-func (s *Session) ExportPDF(writer io.Writer) error {
+func (s *Session) ExportPDF(writer io.Writer, indices ...int) error {
 	if s == nil || s.Reader == nil || s.Renderer == nil || s.doc == nil {
 		return fmt.Errorf("ofd document is not opened")
 	}
+	if len(indices) > 0 {
+		return s.Renderer.RenderToMultiPagePDF(writer, indices...)
+	}
 	pages := make([]*ofdgo.PageContent, len(s.doc.Pages.Page))
 	for i := range pages {
 		page, err := s.pageContent(i)
diff --git a/ofdgo_page_range.go b/ofdgo_page_range.go
new file mode 100644
index 0000000..86b4814
--- /dev/null
+++ b/ofdgo_page_range.go
@@ -0,0 +1,79 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"fmt"
+	"slices"
+	"strconv"
+	"strings"
+)
+
+// ParsePageRange 解析一基页码及闭区间，返回升序去重的零基页面索引
+// 入参: value 页码表达式，如1-6,7,8-10, count 文档总页数
+// 返回: []int 页面索引, error 错误信息
+func ParsePageRange(value string, count int) ([]int, error) {
+	selected := make(map[int]bool)
+	for _, part := range strings.Split(strings.ReplaceAll(value, "，", ","), ",") {
+		first, last, interval := strings.Cut(strings.TrimSpace(part), "-")
+		start, err := strconv.Atoi(strings.TrimSpace(first))
+		if err != nil {
+			return nil, fmt.Errorf("invalid page range %q", part)
+		}
+		end := start
+		if interval {
+			end, err = strconv.Atoi(strings.TrimSpace(last))
+			if err != nil {
+				return nil, fmt.Errorf("invalid page range %q", part)
+			}
+		}
+		if start < 1 || end < start || end > count {
+			return nil, fmt.Errorf("page range %q outside 1-%d", part, count)
+		}
+		for index := start - 1; index < end; index++ {
+			selected[index] = true
+		}
+	}
+	indices := make([]int, 0, len(selected))
+	for index := range selected {
+		indices = append(indices, index)
+	}
+	slices.Sort(indices)
+	return indices, nil
+}
+
+// exportPageIndices 校验导出索引并按原页序去重，省略索引时选取全部页面
+// 入参: count 文档总页数, indices 零基页面索引
+// 返回: []int 页面索引, error 错误信息
+func exportPageIndices(count int, indices []int) ([]int, error) {
+	if count == 0 {
+		return nil, fmt.Errorf("no pages found")
+	}
+	if len(indices) == 0 {
+		indices = make([]int, count)
+		for index := range indices {
+			indices[index] = index
+		}
+		return indices, nil
+	}
+	for _, index := range indices {
+		if index < 0 || index >= count {
+			return nil, fmt.Errorf("page index %d out of range", index)
+		}
+	}
+	indices = slices.Clone(indices)
+	slices.Sort(indices)
+	return slices.Compact(indices), nil
+}
diff --git a/ofdgo_renderer_output.go b/ofdgo_renderer_output.go
index 59c2700..57ac2cd 100644
--- a/ofdgo_renderer_output.go
+++ b/ofdgo_renderer_output.go
@@ -69,9 +69,9 @@ func (r *Renderer) outputRenderer(format string) (string, func(*PageContent, io.
 }
 
 // RenderToZIP 逐页渲染并写入ZIP，文件编号按总页数补零，出错时调用方应丢弃输出
-// 入参: writer 输出流, format svg、pdf、eps、png、jpg或jpeg
+// 入参: writer 输出流, format svg、pdf、eps、png、jpg或jpeg, indices 零基页面索引，省略则全部，按原页序去重
 // 返回: error 错误信息
-func (r *Renderer) RenderToZIP(writer io.Writer, format string) error {
+func (r *Renderer) RenderToZIP(writer io.Writer, format string, indices ...int) error {
 	extension, render, err := r.outputRenderer(format)
 	if err != nil {
 		return err
@@ -80,8 +80,9 @@ func (r *Renderer) RenderToZIP(writer io.Writer, format string) error {
 	if err != nil {
 		return err
 	}
-	if count == 0 {
-		return fmt.Errorf("no pages found")
+	indices, err = exportPageIndices(count, indices)
+	if err != nil {
+		return err
 	}
 	archive := zip.NewWriter(writer)
 	method := zip.Deflate
@@ -89,7 +90,7 @@ func (r *Renderer) RenderToZIP(writer io.Writer, format string) error {
 		method = zip.Store
 	}
 	width := len(strconv.Itoa(count))
-	for index := range count {
+	for _, index := range indices {
 		page, err := r.Reader.PageContentByIndex(index)
 		if err != nil {
 			return fmt.Errorf("failed to read page %d: %w", index+1, err)
@@ -269,26 +270,27 @@ func (r *Renderer) RenderToEPS(page *PageContent, writer io.Writer) error {
 	return buffer.Flush()
 }
 
-// RenderToMultiPagePDF 将整个文档导出为多页PDF
-// 入参: writer 输出流
+// RenderToMultiPagePDF 将文档页面导出为多页PDF
+// 入参: writer 输出流, indices 零基页面索引，省略则全部，按原页序去重
 // 返回: error 错误信息
-func (r *Renderer) RenderToMultiPagePDF(writer io.Writer) error {
+func (r *Renderer) RenderToMultiPagePDF(writer io.Writer, indices ...int) error {
 	doc, err := r.Reader.Doc()
 	if err != nil {
 		return err
 	}
-	if len(doc.Pages.Page) == 0 {
-		return fmt.Errorf("no pages found")
+	indices, err = exportPageIndices(len(doc.Pages.Page), indices)
+	if err != nil {
+		return err
 	}
-	pages := make([]pdfPage, len(doc.Pages.Page))
-	for i, pageRef := range doc.Pages.Page {
-		page, err := r.Reader.PageContent(pageRef)
+	pages := make([]pdfPage, len(indices))
+	for i, index := range indices {
+		page, err := r.Reader.PageContent(doc.Pages.Page[index])
 		if err != nil {
-			return fmt.Errorf("failed to read page %d: %w", i+1, err)
+			return fmt.Errorf("failed to read page %d: %w", index+1, err)
 		}
 		box, err := r.GetPageBox(page)
 		if err != nil {
-			return fmt.Errorf("failed to read page %d area: %w", i+1, err)
+			return fmt.Errorf("failed to read page %d area: %w", index+1, err)
 		}
 		pages[i] = pdfPage{Content: page, Box: box}
 	}
diff --git a/ofdgo_renderer_pdf.go b/ofdgo_renderer_pdf.go
index d7b749f..6e7023f 100644
--- a/ofdgo_renderer_pdf.go
+++ b/ofdgo_renderer_pdf.go
@@ -146,6 +146,7 @@ func (n *pdfNavigation) addAction(page int, rect canvas.Rect, action Action, boo
 // 入参: outlines 大纲节点, level 节点层级, bookmarks 书签, pageIndex 页面索引表, pages 页面数据
 func (n *pdfNavigation) addOutlines(outlines []OutlineElem, level int, bookmarks map[string]Dest, pageIndex map[string]int, pages []pdfPage) {
 	for _, outline := range outlines {
+		nextLevel := level
 		if dest := outlineDest(outline, bookmarks); dest != nil {
 			if page, ok := pageIndex[dest.PageID]; ok {
 				n.Outline[page] = append(n.Outline[page], pdfOutline{
@@ -153,9 +154,10 @@ func (n *pdfNavigation) addOutlines(outlines []OutlineElem, level int, bookmarks
 					Level: level,
 					Y:     pdfDestY(*dest, pages[page].Box.H),
 				})
+				nextLevel++
 			}
 		}
-		n.addOutlines(outline.OutlineElem, level+1, bookmarks, pageIndex, pages)
+		n.addOutlines(outline.OutlineElem, nextLevel, bookmarks, pageIndex, pages)
 	}
 }