:bug: fix https://github.com/Vanessa219/vditor/issues/1549

CHANGELOG.md

@@ -14,6 +14,7 @@
 
 ### v3.9.9 / 2024-01
 
+* [导出 PDF 时主题错误](https://github.com/Vanessa219/vditor/issues/1549) `修复缺陷`
 * [改进表格中行内数学公式 `|` 的渲染](https://github.com/Vanessa219/vditor/issues/1550) `改进功能`
 * [wysiwyg 模式下通过输入框修改元素属性时触发 input](https://github.com/Vanessa219/vditor/issues/1542) `改进功能`
 * [自定义渲染器支持](https://github.com/Vanessa219/vditor/issues/1540) `引入特性`

src/ts/export/index.ts

@@ -36,7 +36,7 @@ window.addEventListener("message", (e) => {
   Vditor.preview(document.getElementById('preview'), e.data, {
     cdn: "${vditor.options.cdn}",
     markdown: {
-      theme: "${vditor.options.preview.theme}"
+      theme: ${JSON.stringify(vditor.options.preview.theme)}
     },
     hljs: {
       style: "${vditor.options.preview.hljs.style}"