We learned about the use of the subject of a label, this one we will talk about how the main document contains another theme：
We see the system default theme file "index.html" the first line of code and the last line of code are：
{include file="public/default/header.html" /}
{include file="public/default/footer.html" /}
This means that the index.html file introduces two files, the header file header.html and the footer file footer.html.
Header and footer files are also introduced in article.html and category.html files to reduce duplication.
For example, the following code：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>{$title} | {$subtitle}</title>
<meta name="keywords" content="{$keyword}">
<meta name="description" content="{$description}">
</head>
<body>
Web page content</body>
</html>
You can place the top portion of the Page Content into the header file and put the two lines of code below the Page Content into the footer file. Then this file looks like this is the following：
{include file="public/default/header.html" /}
Web page content
{include file="public/default/footer.html" /}
When several files have the same page header and footer files, we save a lot of code, of course, you can also choose not to page header and footer files.
Note: Replace the gray part above with the name of your theme folder.
So far, we have finished the theme of the content produced, the specific production also requires you to practice more.
Original article, reproduced please specify：Chapter 3: The theme file contains | Catfish(鲶鱼) CMS
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