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Markdown

---
title: Base 模板 and Blocks
linktitle:
description: The base and block constructs allow you to define the outer shell of your master templates (i.e., the chrome of the page).
godocref: https://golang.org/pkg/text/template/#example_Template_block
date: 2017-02-01
publishdate: 2017-02-01
lastmod: 2017-02-01
categories: [templates,fundamentals]
keywords: [blocks,base]
menu:
docs:
parent: "templates"
weight: 20
weight: 20
sections_weight: 20
draft: false
aliases: [/templates/blocks/,/templates/base-templates-and-blocks/]
toc: true
---
The `block` keyword allows you to define the outer shell of your pages' one or more master template(s) and then fill in or override portions as necessary.
{{< youtube QVOMCYitLEc >}}
## Base Template Lookup Order
The [lookup order][lookup] for base templates is as follows:
1. `/layouts/section/<TYPE>-baseof.html`
2. `/themes/<THEME>/layouts/section/<TYPE>-baseof.html`
3. `/layouts/<TYPE>/baseof.html`
4. `/themes/<THEME>/layouts/<TYPE>/baseof.html`
5. `/layouts/section/baseof.html`
6. `/themes/<THEME>/layouts/section/baseof.html`
7. `/layouts/_default/<TYPE>-baseof.html`
8. `/themes/<THEME>/layouts/_default/<TYPE>-baseof.html`
9. `/layouts/_default/baseof.html`
10. `/themes/<THEME>/layouts/_default/baseof.html`
Variables are denoted by capitalized text set within `<>`. Note that Hugo's default behavior is for `type` to inherit from `section` unless otherwise specified.
### Example Base Template Lookup Order
As an example, let's assume your site is using a theme called "mytheme" when rendering the section list for a `post` section. Hugo picks `layout/section/post.html` as the template for [rendering the section][]. The `{{define}}` block in this template tells Hugo that the template is an extension of a base template.
Here is the lookup order for the `post` base template:
1. `/layouts/section/post-baseof.html`
2. `/themes/mytheme/layouts/section/post-baseof.html`
3. `/layouts/post/baseof.html`
4. `/themes/mytheme/layouts/post/baseof.html`
5. `/layouts/section/baseof.html`
6. `/themes/mytheme/layouts/section/baseof.html`
7. `/layouts/_default/post-baseof.html`
8. `/themes/mytheme/layouts/_default/post-baseof.html`
9. `/layouts/_default/baseof.html`
10. `/themes/mytheme/layouts/_default/baseof.html`
## Define the Base Template
The following defines a simple base template at `_default/baseof.html`. As a default template, it is the shell from which all your pages will be rendered unless you specify another `*baseof.html` closer to the beginning of the lookup order.
{{< code file="layouts/_default/baseof.html" download="baseof.html" >}}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>{{ block "title" . }}
<!-- Blocks may include default content. -->
{{ .Site.Title }}
{{ end }}</title>
</head>
<body>
<!-- Code that all your templates share, like a header -->
{{ block "main" . }}
<!-- The part of the page that begins to differ between templates -->
{{ end }}
{{ block "footer" . }}
<!-- More shared code, perhaps a footer but that can be overridden if need be in -->
{{ end }}
</body>
</html>
{{< /code >}}
## Override the Base Template
From the above base template, you can define a [default list template][hugolists]. The default list template will inherit all of the code defined above and can then implement its own `"main"` block from:
{{< code file="layouts/_default/list.html" download="list.html" >}}
{{ define "main" }}
<h1>Posts</h1>
{{ range .Pages }}
<article>
<h2>{{ .Title }}</h2>
{{ .Content }}
</article>
{{ end }}
{{ end }}
{{< /code >}}
This replaces the contents of our (basically empty) "main" block with something useful for the list template. In this case, we didn't define a `"title"` block, so the contents from our base template remain unchanged in lists.
{{% warning %}}
Code that you put outside the block definitions *can* break your layout. This even includes HTML comments. For example:
```
<!-- Seemingly harmless HTML comment..that will break your layout at build -->
{{ define "main" }}
...your code here
{{ end }}
```
[See this thread from the Hugo discussion forums.](https://discourse.gohugo.io/t/baseof-html-block-templates-and-list-types-results-in-empty-pages/5612/6)
{{% /warning %}}
The following shows how you can override both the `"main"` and `"title"` block areas from the base template with code unique to your [default single page template][singletemplate]:
{{< code file="layouts/_default/single.html" download="single.html" >}}
{{ define "title" }}
<!-- This will override the default value set in baseof.html; i.e., "{{.Site.Title}}" in the original example-->
{{ .Title }} &ndash; {{ .Site.Title }}
{{ end }}
{{ define "main" }}
<h1>{{ .Title }}</h1>
{{ .Content }}
{{ end }}
{{< /code >}}
[hugolists]: /templates/lists
[lookup]: /templates/lookup-order/
[rendering the section]: /templates/section-templates/
[singletemplate]: /templates/single-page-templates/