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This plugin allows you to include extra JavaScript or CSS files in your WordPress page.
You can:
<ul>
<li>Include as many as you like.</li>
<li>Choose whether files are to be included on the front-end or the back-end.</li>
<li>Choose where to include them in the header or the footer.</li>
<li>Choose conditions to use for inclusion (logged-in users only, admin users only, front page only).</li>
<li>Choose conditions of you can add.</li>
</ul>
Please if you want to add conditions. 
For example add filter:
<pre><code>add_filter( 'jcim_condition' , 'my_conditions' );
function my_conditions( ) {
 $conditions = array(
 array(
 "code" => "current_user_can",
 "val" => "edit_themes",
 "desc" => "Only edit theme role have user",
 "help_link" => "https://codex.wordpress.org/Function_Reference/current_user_can"
 ),
 array(
 "code" => "is_admin",
 "val" => "",
 "desc" => "Only admin screen",
 "help_link" => ""
 ),
 );
 return $conditions;
}
</code></pre>
<h3>日本語でのご説明</h3>
このプラグインは、よくごちゃごちゃになってしまうjavascriptファイルの読み込みとcssファイルの読み込みを、 
管理画面だけ、またはサイトだけに読み込むファイルを、１箇所で管理するためのプラグインです。 
サイトで何のファイルを読み込んでいるのか、すっきり。

Js Css Include Manager

This plug-in is a will clean the file management. You can only manage the screen. You can also only site the screen.

Mindvalley

This shortcode will allow you to include the content from any posts or pages.
Shortcode usage:
<ul>
<li>[mv_include id=’4′] (best for performance)</li>
<li>[mv_include slug=’the-post-slug’]</li>
<li>[mv_include path=’http://www.example.com/parent-page/sub-page/’]</li>
<li>[mv_include path=’parent-page/sub-page’]</li>
</ul>
The plugin also create a special post type that can be used for content that are for inclusion only.

Mindvalley Include Post Content

Creates shortcode [mv_include] to include content from another post/page.

Js Css Include Manager vs Mindvalley Include Post Content