Fix affix bug

[stevenjoezhang]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines.
• Tests for the changes was maked (for bug fixes / features).
  • Muse | Mist have been tested.
  • Pisces | Gemini have been tested.
• Docs in NexT website have been added / updated (for features).

PR Type

What kind of change does this PR introduce?

• Bugfix.
• Feature.
• Code style update (formatting, local variables).
• Refactoring (no functional changes, no api changes).
• Build related changes.
• CI related changes.
• Documentation content changes.
• Other... Please describe:

What is the current behavior?

Revert iissnan/hexo-theme-next@1280837
Issue resolved: N/A

What is the new behavior?

• Screenshots with this changes: N/A
  

• Link to demo site with this changes: N/A

How to use?

In NexT _config.yml:

...

Does this PR introduce a breaking change?

• Yes.
• No.

[stevenjoezhang]

@zq1997 Could you please help to confirm whether this PR has fixed the problem: #846

[hsiangfeng]

看到留言版，我一直在想分頁以及標籤頁面的留言版需要出現嗎?
因為一般使用者很少會在這兩個頁面留言，絕大部分都是在文章內留言。

[stevenjoezhang]

同意，但分頁以及標籤頁面的comments默認是true

https://hexo.io/docs/front-matter

需要由Hexo解决

Hexo

Front-matter

Front-matter is a block of YAML or JSON at the beginning of the file that is used to configure settings for your writings. Front-matter is terminated by three dashes when written in YAML or three sem

[hsiangfeng]

同意，但分頁以及標籤頁面的comments默認是true

https://hexo.io/docs/front-matter

需要由Hexo解决

Hexo**Front-matter**Front-matter is a block of YAML or JSON at the beginning of the file that is used to configure settings for your writings. Front-matter is terminated by three dashes when written in YAML or three sem

目前我的作法是採用以下方式來決定要不要顯示留言板

{% set page_type = page.type === 'tags' || page.type === 'categories' %}
<div style="{%if page_type %} visibility:hidden; height:0px;{% endif %}">
{% include '_partials/comments.swig' %}
</div>

Hexo

Front-matter

Front-matter is a block of YAML or JSON at the beginning of the file that is used to configure settings for your writings. Front-matter is terminated by three dashes when written in YAML or three sem

[Raincal]

鉴于现在已经移除了 IE 支持，要不要考虑一下用 position: sticky 替代 affix

[stevenjoezhang]

嗯，bootstrap也移除了affix支持：
https://v4-alpha.getbootstrap.com/migration/#components

Migrating to v4

The most popular HTML, CSS, and JS framework in the world.

不过affix和position: sticky并不完全等价，实现还需要额外的工作。先加到Roadmap里了。

[stevenjoezhang]

@hsiangfeng 谢谢。我已在tags和categories的Front-matter中设置了commets: false

[stevenjoezhang]

See also: iissnan/hexo-theme-next#2180

About position: sticky: https://caniuse.com/#search=position%20sticky

[stevenjoezhang]

已实现 position: sticky 替代 affix next-theme/hexo-theme-next@b9968b6