我不知道应该如何设置我想要的字体(I don't know how to set the font I want).

[woyishijiazhuang]

 const mupdfjs = await import(/* @vite-ignore */ mupdfScript);
  const url = '/test.pdf'
  let response = await fetch(url)
  if (!response.ok) {
      console.error(`Cannot fetch document: ${response.statusText}`)
      return
  }
  let arrayBuffer = await response.arrayBuffer()
  let document = await mupdfjs.Document.openDocument(
    arrayBuffer,
    'application/pdf'
  );
  document.setLanguage('zh-Hans')
  let font_res = await fetch('/QingNiaoHuaGuangJianMeiHei-2.ttf')
  let font_buffer = await font_res.arrayBuffer()
  const font = await new mupdfjs.Font('青鸟华光简美黑', font_buffer)

  console.log(`Character encoding for '帅': ${font.encodeCharacter('帅')}`); // print 2337, 验证是否正确创建Font
  await document.addCJKFont(font, 'zh-Hans') 

  const page = document.loadPage(0);

  let freeText = page.createAnnotation("FreeText")
  freeText.setContents("我是大帅哥")
  freeText.setLanguage('zh-Hans') // 如果使用默认值, 无法显示 '帅' 字
  console.log(font.getName()) // print 青鸟华光简美黑
  freeText.setDefaultAppearance(font.getName() , 16, [0,1,0]);
  console.log(freeText.getDefaultAppearance()) // print {font: 'Helv', size: 16, color: Array(3)}
  freeText.setRect([0,0,200,50])
  freeText.update()
  page.update()
  const scale = (window.devicePixelRatio * 96) / 72
  let pixmap = await page.toPixmap([scale, 0, 0, scale, 0, 0], mupdfjs.ColorSpace.DeviceRGB, false, true)

  let pngImage = await pixmap.asPNG()
  base64Image.value = URL.createObjectURL(new Blob([pngImage], { type: 'image/png' }));

页面上显示为

我想要的显示为

[jamie-lemon]

Thank you for this report and the code sample - I don't think you are doing anything wrong.
At the moment setDefaultAppearance can only use the in-built fonts as explained here: https://mupdfjs.readthedocs.io/en/latest/classes/PDFAnnotation.html#setDefaultAppearance

We will hopefully rectify this in the next release.

[jamie-lemon]

@ccxvii Another one to consider for the start of 2025! 🎆