博客网页可以在电脑端加载出pdf，但是不能在iPad、iPhone上加载出pdf

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Issue Checklist

[x] I am using the latest version of NexT.
[x] I have read the relevant documents of Hexo and NexT.
[ x I have reviewed the latest Roadmap on GitHub and searched for current issues, which does not help me.

Expected behavior

希望能在移动端（如ipad，iphone）打开网页时能够查看插入的pdf文件

Actual behavior

无法显示pdf文件

Links to demo site with this issue: https://physchtest.github.io/2021/07/25/2019%E5%AD%A6%E5%B9%B4%E4%BF%A1%E6%81%AF%E5%85%89%E5%AD%A6%E6%9C%9F%E6%9C%AB%E8%AF%95%E9%A2%98/
Links to repository or source code of the blog: N/A

Steps to reproduce the behavior

使用移动端设备打开网页
N/A
N/A

Environment Information

Node.js and NPM Information

v14.17.3
6.14.13

Package dependencies Information

hexo-site@0.0.0 C:\Users\keqia\.ssh\Blog\blog
+-- hexo@5.4.0
+-- hexo-deployer-git@3.0.0
+-- hexo-generator-archive@1.0.0
+-- hexo-generator-category@1.0.0
+-- hexo-generator-index-pin-top@0.2.2
+-- hexo-generator-searchdb@1.3.4
+-- hexo-generator-tag@1.0.0
+-- hexo-pdf@1.1.1
+-- hexo-renderer-ejs@1.0.0
+-- hexo-renderer-marked@4.0.0
+-- hexo-renderer-stylus@2.0.1
+-- hexo-server@2.0.0
+-- hexo-theme-landscape@0.0.3
`-- hexo-theme-next@8.6.1

Hexo Configuration

# Hexo Configuration
## Docs: https://hexo.io/docs/configuration.html
## Source: https://github.com/hexojs/hexo/

# Site
title: '中山大学物理学院期末试卷分享&讨论'
subtitle: ''
description: '分享 讨论 学习 进步'
keywords:
author: Ke.Qiao.Ω.Tesla.Mu
language: zh-CN
timezone: ''

# URL
## Set your site url here. For example, if you use GitHub Page, set url as 'https://username.github.io/project'
url: https://physchtest.github.io
permalink: :year/:month/:day/:title/
permalink_defaults:
pretty_urls:
  trailing_index: true # Set to false to remove trailing 'index.html' from permalinks
  trailing_html: true # Set to false to remove trailing '.html' from permalinks

# Directory
source_dir: source
public_dir: public
tag_dir: tags
archive_dir: archives
category_dir: categories
code_dir: downloads/code
i18n_dir: :lang
skip_render:

# Writing
new_post_name: :title.md # File name of new posts
default_layout: post
titlecase: false # Transform title into titlecase
external_link:
  enable: true # Open external links in new tab
  field: site # Apply to the whole site
  exclude: ''
filename_case: 0
render_drafts: false
post_asset_folder: true
relative_link: false
future: true
highlight:
  enable: true
  line_number: true
  auto_detect: false
  tab_replace: ''
  wrap: true
  hljs: false
prismjs:
  enable: false
  preprocess: true
  line_number: true
  tab_replace: ''

# Home page setting
# path: Root path for your blogs index page. (default = '')
# per_page: Posts displayed per page. (0 = disable pagination)
# order_by: Posts order. (Order by date descending by default)
index_generator:
  path: ''
  per_page: 10
  order_by: -date

# Category & Tag
default_category: uncategorized
category_map:
tag_map:

# Metadata elements
## https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta
meta_generator: true

# Date / Time format
## Hexo uses Moment.js to parse and display date
## You can customize the date format as defined in
## http://momentjs.com/docs/#/displaying/format/
date_format: YYYY-MM-DD
time_format: HH:mm:ss
## updated_option supports 'mtime', 'date', 'empty'
updated_option: 'mtime'

# Pagination
## Set per_page to 0 to disable pagination
per_page: 10
pagination_dir: page

# Include / Exclude file(s)
## include:/exclude: options only apply to the 'source/' folder
include:
exclude:
ignore:

# Extensions
## Plugins: https://hexo.io/plugins/
## Themes: https://hexo.io/themes/
theme: next

search:
  path: ./public/search.json
  field: post
  format: html
  limit: 10000

# Deployment
## Docs: https://hexo.io/docs/one-command-deployment
deploy:
  type: git
  repo: https://github.com/physchtest/physchtest.github.io.git
  branch: main

NexT Configuration

# Schemes
#scheme: Mist
#scheme: Muse
scheme: Pisces
#scheme: Gemini

menu:
  home: / 
  archives: /archives
  #about: /about/ || fa fa-user
  tags: /tags/ || fa fa-tags
  categories: /categories/ || fa fa-th
  #archives: /archives/ || fa fa-archive
  #schedule: /schedule/ || fa fa-calendar
  #sitemap: /sitemap.xml || fa fa-sitemap
  #commonweal: /404/ || fa fa-heartbeat

avatar:
  # Replace the default image and set the url here.
  url: https://i.loli.net/2021/07/14/F6SxZOAzHPLfoha.jpg
  # If true, the avatar will be dispalyed in circle.
  rounded: true
  # If true, the avatar will be rotated with the cursor.
  rotated: false

comments:
  # Available values: tabs | buttons
  style: tabs
  # Choose a comment system to be displayed by default.
  # Available values: disqus | disqusjs | changyan | livere | gitalk | utterances
  active: gitalk
  # Setting `true` means remembering the comment system selected by the visitor.
  storage: true
  # Lazyload all comment systems.
  lazyload: false
  # Modify texts or order for any navs, here are some examples.
  nav:
    #disqus:
    #  text: Load Disqus
    #  order: -1
    gitalk:
      order: -2

gitalk:
  enable: true
  github_id: physchtest
  repo: blog
  client_id: b5195c30ca7a4ca261db
  client_secret: f25c129f2d343c85c55ea6f952c2977a3dafd281
  admin_user: physchtest
  distraction_free_mode: true # Facebook-like distraction free mode
  # When the official proxy is not available, you can change it to your own proxy address
  proxy:  https://cors-anywhere.azm.workers.dev/https://github.com/login/oauth/access_token# This is official proxy adress
  # Gitalk's display language depends on user's browser or system environment
  # If you want everyone visiting your site to see a uniform language, you can set a force language value
  # Available values: en | es-ES | fr | ru | zh-CN | zh-TW
  language: zh-CN

# PDF tag
# NexT will try to load pdf files natively, if failed, pdf.js will be used.
# So, you have to install the dependency of pdf.js if you want to use pdf tag and make it available to all browsers.
# Dependencies: https://github.com/next-theme/theme-next-pdf
pdf:
  enable: true
  # Default height
  height: 500px

theme-next / hexo-theme-next

博客网页可以在电脑端加载出pdf，但是不能在iPad、iPhone上加载出pdf #1657